COHU


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments
us-gaap:StatementGeographical

us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization

us-gaap:CostDepreciationAmortizationAndDepletion

us-gaap:CostsAndExpenses

us-gaap:ResearchAndDevelopmentExpense
us-gaap:ConsolidationItems
us-gaap:GeneralAndAdministrativeExpense

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:OperatingIncomeLoss

us-gaap:InterestExpense

us-gaap:InterestPaidNet

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:IncomeStatementLocation

us-gaap:IncomeLossFromContinuingOperations

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxesPaidNet

us-gaap:ProfitLoss

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:NetIncomeLoss

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:Assets
us-gaap:ConsolidationItems
us-gaap:StatementBusinessSegments

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:InventoryNet

us-gaap:OtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AmortizationOfIntangibleAssets

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:Goodwill
us-gaap:ReportingUnit
us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass
us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:LiabilitiesCurrent

us-gaap:LongTermDebtCurrent
us-gaap:DebtInstrument
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:AccountsPayableCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:OperatingLeaseLiabilityCurrent
us-gaap:BalanceSheetLocation

us-gaap:ContractWithCustomerLiabilityCurrent
us-gaap:DebtInstrument
us-gaap:LongTermDebt
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LongTermDebtNoncurrent

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:StockholdersEquity

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss

us-gaap:ProfitLoss

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInInventories

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:PaymentsOfDividendsCommonStock
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentInterestRateStatedPercentage
us-gaap:DebtInstrument, us-gaap:Range
us-gaap:Range, us-gaap:DebtInstrument

us-gaap:EffectiveIncomeTaxRateContinuingOperations
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

cohu:AmortizationOfInventoryStepupAndInventoryRelatedCharges
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
cohu:CapitalizedCloudComputingServiceCostsButNotYetPaid
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:SubsequentEventType
cohu:DisposalGroupIncludingDiscontinuedOperationImpairment

cohu:IncreaseDecreaseInAccruedCompensationWarrantyAndOtherLiabilities

cohu:IncreaseDecreaseInCurrentAndNoncurrentOperatingLeaseLiabilities

cohu:IncreaseDecreaseInDeferredProfit

cohu:IncreaseDecreaseInOperatingLeaseRightOfUseAssets

cohu:InterestCapitalizedAssociatedWithCloudComputingImplementation

cohu:InventoryCapitalizedAsPropertyPlantAndEquipment
us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:StatementBusinessSegments
cohu:NumberOfMajorCustomers

cohu:ProceedsFromRepaymentsOfBankDebt

cohu:ProfitLossFromOperatingSegment
us-gaap:StatementBusinessSegments

us-gaap:AllocatedShareBasedCompensationExpenseNetOfTax

us-gaap:AmortizationOfFinancingCostsAndDiscounts

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CommonStockDividendsPerShareDeclared
us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:MajorCustomers, us-gaap:StatementBusinessSegments
us-gaap:ConcentrationRiskPercentage1

us-gaap:DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax

us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax

us-gaap:DiscontinuedOperationTaxEffectOfDiscontinuedOperation

us-gaap:DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss

us-gaap:DisposalGroupIncludingDiscontinuedOperationRevenue

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense

us-gaap:FinanceLeaseInterestExpense

us-gaap:FinanceLeaseInterestPaymentOnLiability

us-gaap:FinanceLeasePrincipalPayments

us-gaap:FinanceLeaseRightOfUseAssetAmortization

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

us-gaap:ForeignCurrencyTransactionGainLossRealized

us-gaap:GainLossOnDispositionOfAssets1

us-gaap:GoodwillForeignCurrencyTranslationGainLoss
us-gaap:ReportingUnit

us-gaap:ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccruedIncomeTaxesPayable

us-gaap:IncreaseDecreaseInContractWithCustomerLiability

us-gaap:IncreaseDecreaseInOtherAccruedLiabilities

us-gaap:IncreaseDecreaseInOtherCurrentAssets

us-gaap:IncreaseDecreaseInOtherNoncurrentAssets

us-gaap:InvestmentIncomeInterestAndDividend

us-gaap:LeaseCost

us-gaap:NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeasePayments

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan
us-gaap:PaymentsForRestructuring

us-gaap:PensionAndOtherPostretirementBenefitExpense

us-gaap:ProceedsFromConstructionLoansPayable

us-gaap:ProceedsFromDivestitureOfBusinessesNetOfCashDivested

us-gaap:ProceedsFromRepurchaseOfEquity

us-gaap:ProceedsFromSalesOfAssetsInvestingActivities

us-gaap:ProductWarrantyAccrualPayments

us-gaap:ProductWarrantyAccrualWarrantiesIssued

us-gaap:RestructuringCharges
us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan
us-gaap:RestructuringPlan
us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan
us-gaap:RestructuringReserveTranslationAndOtherAdjustment

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod

us-gaap:ShortTermLeaseCost

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardGross

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised
us-gaap:StatementEquityComponents

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue
us-gaap:StatementEquityComponents

us-gaap:SubleaseIncome

us-gaap:UnrecognizedTaxBenefitsPeriodIncreaseDecrease

us-gaap:VariableLeaseCost

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

cohu:AvailableForSaleSecuritiesDebtMaturitiesDueAfterOneYearThroughThreeYearsEstimatedFairValue

cohu:AvailableforsaleSecuritiesDebtMaturitiesYearTwoThroughThreeAmortizedCostBasis

cohu:DebtLongtermAndShorttermCombinedAmountGross

cohu:DeferredProfit

cohu:DeferredProfitLongterm

cohu:LeaseLiability

cohu:LeaseLiabilityNoncurrent

cohu:LeaseRightofuseAsset
us-gaap:Range, us-gaap:AwardType
cohu:ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfSharesAvailableForIssue

us-gaap:AccountsAndOtherReceivablesNetCurrent

us-gaap:AccruedIncomeTaxesNoncurrent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetsHeldForSaleNotPartOfDisposalGroupCurrent

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperation

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecurities
us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesAmortizedCost

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue

us-gaap:AvailableForSaleSecuritiesCurrent
us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
us-gaap:CashAndCashEquivalents, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:CashAndCashEquivalents, us-gaap:FairValueByMeasurementFrequency

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
us-gaap:DebtInstrument
us-gaap:DebtInstrumentCarryingAmount
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentFaceAmount

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet

us-gaap:DeferredIncome

us-gaap:DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent

us-gaap:DisposalGroupIncludingDiscontinuedOperationCash

us-gaap:DividendsPayableCurrentAndNoncurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:FinanceLeaseLiabilityCurrent
us-gaap:BalanceSheetLocation

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:FinanceLeaseRightOfUseAsset

us-gaap:FinanceLeaseRightOfUseAssetAccumulatedAmortization

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsGross
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:InventoryFinishedGoodsNetOfReserves

us-gaap:InventoryRawMaterialsAndSuppliesNetOfReserves

us-gaap:InventoryWorkInProcessNetOfReserves

us-gaap:LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent

us-gaap:LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent

us-gaap:LineOfCredit
us-gaap:CreditFacility
us-gaap:CreditFacility
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

us-gaap:LoansPayableToBankCurrent

us-gaap:LongTermLoansFromBank

us-gaap:OtherAccruedLiabilitiesNoncurrent

us-gaap:PostemploymentBenefitsLiabilityNoncurrent

us-gaap:PrepaidExpenseCurrent

us-gaap:ProductWarrantyAccrual

us-gaap:ProductWarrantyAccrualClassifiedCurrent
us-gaap:BalanceSheetLocation
us-gaap:ProductWarrantyAccrualNoncurrent
us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan
us-gaap:RestructuringReserve
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
us-gaap:AwardType
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding

us-gaap:ShortTermBankLoansAndNotesPayable

Tables

  2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
us-gaap:CommonStockValue ██████▇▁▁▁▁▁41.86241.68641.39541.26541.141.01540.76328.90128.88328.79628.48928.213NA27.889NA27.27826.84226.71226.67726.58626.2426.12826.10825.90825.69225.53525.39825.24825.0824.94224.90824.71324.63224.48324.47324.36324.3324.16124.146NA23.989NANA
us-gaap:CommonStockSharesIssued ██████▇▁▁▁▁▁41.86241.68641.39541.26541.141.01540.76328.90128.88328.79628.48928.213NA27.889NA27.27826.84226.71226.67726.58626.2426.12826.10825.90825.69225.53525.39825.24825.0824.94224.90824.71324.63224.48324.47324.36324.3324.16124.146NA23.989NANA
us-gaap:CommonStockSharesOutstanding ██████▇▁▁▁▁▁41.86241.68641.39541.26541.141.01540.76328.90128.88328.79628.48928.213NA27.889NA27.27826.84226.71226.67726.58626.2426.12826.10825.90825.69225.53525.39825.24825.0824.94224.90824.71324.63224.48324.47324.36324.3324.16124.146NA23.989NANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▁41.84441.502NA41.22941.12540.872NA29.7729.65129.531NA29.105NA28.725NA28.252NA27.36727.35826.317NA26.79626.72225.751NA26.17425.79725.123NA24.92924.81724.657NA24.47924.43224.353NA24.47824.48424.483NA24.11124.086
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▁41.84441.502NA41.22941.12540.872NA28.94828.89328.602NA28.155NA27.708NA26.978NA26.76126.71126.317NA26.17526.05925.751NA25.48125.32425.123NA24.92924.81724.657NA24.47924.43224.353NA24.15824.10324.018NA23.80223.657
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount █▁0.2860.058NA0.4590.610.393NA0.00.0030.034NA0.005NA0.046NA0.258NANA0.773NANA0.8570.843NANA1.3462.231NANANANANANANANANANA2.0852.035NANANANA
us-gaap:EarningsPerShareBasic ▆▅▅▅▅▄▁▇██▇███▇▇▇▆▇▆▇▇▆▆▆█▇▆▅▅▆▅▆▆▆▆▇▇▇▇███-1.1e-07-4.2e-07-4.2e-07-2.5e-07-4.6999999999999995e-07-5.5e-07-1.4e-061.7000000000000001e-074.0000000000000003e-072.8e-072.4e-073.1e-073.8e-073.8e-072.5e-072.5e-078e-081e-081.0000000000000001e-07-7e-087e-084e-080.0-1.1e-071e-083e-071.6e-07-1.3e-07-2.6e-07-4.3e-07-1.6e-07-4.9e-07-2.1e-07-7e-08-9e-08-1.3e-073e-081.4e-072.1e-072.7e-074.0000000000000003e-073.2e-072.8e-07
us-gaap:EarningsPerShareDiluted ▆▅▅▅▅▄▁▇██▇███▇▇▇▇▇▆▇▇▆▆▇█▇▆▅▅▆▅▆▆▆▆▇▇▇████-1.1e-07-4.2e-07-4.2e-07-2.5e-07-4.6999999999999995e-07-5.5e-07-1.4e-061.6e-073.9e-072.8e-072.3000000000000002e-073e-073.6e-073.6e-072.4e-072.4e-078e-081e-081.0000000000000001e-07-7e-087e-084e-080.0-1.1e-071e-082.9e-071.6e-07-1.3e-07-2.6e-07-4.3e-07-1.6e-07-4.9e-07-2.1e-07-7e-08-9e-08-1.3e-073e-081.4e-072.1e-072.7e-073.9e-073.2e-072.8e-07
us-gaap:IncomeLossFromContinuingOperationsPerBasicShare ▆▅▅▅▅▄▁▇██▇███▇▇▇▆▇▆▇▇▇▆▇█▇▆▅▅▆▄-1.1e-07-4.2e-07-3.9e-07-2.5e-07-4.6999999999999995e-07-5.6e-07-1.4e-061.7000000000000001e-074.0000000000000003e-072.8e-072.4e-073.1e-073.9e-073.9e-072.5e-072.5e-079e-081e-081.0000000000000001e-07-7e-089e-085.0000000000000004e-081.5e-07-1.1e-075.0000000000000004e-082.8e-074e-08-1.3e-07-2.7e-07-4.4e-07-1.7000000000000001e-07-5e-07NANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare ▆▅▅▅▅▄▁▇██▇███▇▇▇▇▇▆▇▇▇▆▇█▇▆▅▅▆▅-1.1e-07-4.2e-07-3.9e-07-2.5e-07-4.6999999999999995e-07-5.6e-07-1.4e-061.6e-073.9e-072.8e-072.3000000000000002e-073e-073.7e-073.7e-072.4e-072.4e-078e-081e-081.0000000000000001e-07-7e-088e-085.0000000000000004e-081.5e-07-1.1e-075.0000000000000004e-082.7e-074e-08-1.3e-07-2.7e-07-4.4e-07-1.7000000000000001e-07-5e-07NANANANANANANANANANANA
  2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax ▆▆▆▆▇▇█▃▄▄▃▄▄▄▃▃▂▂▂▂▂▂▂▂▄▄▃▂▂▂▂▁▁▁▂▁▂▂▃▃▄▃▂144.084138.921142.011143.498150.011147.809170.63786.16499.81795.1584.0993.65193.86693.86681.09781.09770.69469.25976.35365.77863.48467.51275.21168.06896.16894.44177.8568.41764.6759.96266.65256.01650.71457.74859.40453.29666.55971.81380.89689.796.90286.06674.869
us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization █▁83.12782.837NANA87.60593.394NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CostDepreciationAmortizationAndDepletion ▁█0.0072567.266NANA0.0076257.641NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CostsAndExpenses ▄▄▅▄▅▅█▁▁▁▁▁144.612152.547155.67149.521164.673165.793231.00879.38586.01985.13779.42483.233NA82.222NA73.07767.65768.26372.98967.5161.25965.24671.05169.77394.09985.03376.80571.83571.13671.92267.1368.94556.41960.35561.46957.00365.35469.15375.06782.05886.40477.28565.942
us-gaap:ResearchAndDevelopmentExpense ▇█▇▇███▂▂▂▂▁20.42422.46820.82320.48322.10822.73322.5211.08811.05111.77511.8869.609NA9.466NA9.77610.0998.6348.3057.8038.2068.6057.7319.62910.1829.67910.1811.17211.78211.63611.19213.469.9779.1368.6888.379.0398.8249.2849.0839.7418.7999.012
 us-gaap:GeneralAndAdministrativeExpense us-gaap:ConsolidationItems us-gaap:CorporateNonSegment▁▂▂▂▁▂█▂▃▂0.8483.4512.4832.0761.5483.74114.9743.1625.1992.122NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:SellingGeneralAndAdministrativeExpense ▄▅▅▅▆▆█▁▁▁▁▁30.94933.35234.53233.6936.42838.28645.82816.51116.65217.76317.87116.882NA16.02NA14.4612.34613.59115.01513.3713.16411.92313.81113.83514.12414.08914.25916.04713.63214.84513.21815.05312.37711.59711.04110.87611.16811.87111.43412.0912.25212.4979.489
us-gaap:OperatingIncomeLoss ▇▅▅▆▅▅▁▇██▇█-0.528-13.626-13.659-6.023-14.662-17.984-60.3716.77913.79810.0134.66610.418NA11.644NA8.023.0370.9963.364-1.7322.2252.2664.16-1.7052.0699.4081.045-3.418-6.466-11.96-4.896-12.929-5.705-2.607-2.065-3.7071.2052.665.8297.64210.4988.7818.927
us-gaap:InterestExpense ▅▇▇▇██▇▁▁▁3.4564.4274.7675.05.2825.5074.9440.0110.0110.011NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InterestPaidNet ▄█▁▆▆▆3.5347.3080.0264.7324.9585.13NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AllocatedShareBasedCompensationExpense ▅▆▅▅▆▆█▂▂▁▁▁3.4033.6113.2873.5063.6623.6934.5561.881.9481.6691.6711.86NA1.759NA1.7171.8671.6681.6511.9571.6741.6371.7461.6981.7551.5851.613NANANANANANA0.9591.251NANA0.9230.938NANANANA
us-gaap:IncomeLossFromContinuingOperations ▆▅▅▆▅▄▁▇████████▇▇▇▇▇▇▇▇▇█▇▆▆▆▆▆-4.74-17.318-16.281-10.48-19.383-22.851-57.1164.80311.6488.1226.8958.75510.70810.7086.7636.7632.3060.2182.662-1.9112.291.3353.887-2.741.3376.9210.931-3.354-6.578-11.113-4.334-12.235NANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments ▆▅▅▆▅▅▁▇██▇█-4.603-18.31-19.524-9.203-20.299-23.051-63.3827.10514.11610.2494.86610.592NA11.786NA8.1213.2061.0673.423-1.6892.252.2754.164-1.6992.0749.4141.05-3.403-6.454-11.944-4.88-12.919-5.658-1.868-1.976-3.6151.3072.7745.9457.75210.628.9089.065
us-gaap:IncomeTaxExpenseBenefit ▆▅▃▇▅▆▁███▄▇0.137-0.992-3.2431.277-0.916-0.2-6.2662.3022.4682.127-2.0291.837NA1.078NA1.3580.9150.8490.7610.222-0.040.940.2771.0410.7372.4930.119-0.056-0.004-1.124-0.546-0.816-0.497-0.1190.133-0.3910.588-0.6020.8951.1781.1921.2972.367
us-gaap:IncomeTaxesPaidNet ▂▂▃▄█▅▄▂▁▄▄▁1.4130.691.6672.5856.8933.7972.6940.9410.112.4983.354-0.021NA1.449NA2.3120.8310.8164.9130.2480.1610.120.169-0.703-0.0050.3850.2810.310.2350.1860.137-1.458-0.1220.599NANA0.631.351NANA1.1830.893NA
us-gaap:ProfitLoss ▆▅▅▆▅▄▁▇█████-4.74-17.276-17.32-10.326-19.359-22.687-56.9974.80311.6488.1226.8958.75510.43NA6.763NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax ▆▅█▁▇▄▄▅▃▇▆▆1.897-0.9297.328-13.2763.684-5.262-5.47-0.475-6.8143.8541.372.57NA3.359NA4.046-8.5130.561-0.3422.505-1.246-4.2212.81-8.343-5.475-8.537-0.380.2851.5074.6351.13-4.0021.9692.132-4.9952.583-3.718-4.854NANANANANA
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▆▅█▁▇▄▄▆▃▇1.897-0.9296.234-13.2413.645-4.788-4.682-0.49-6.6923.771NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest 0.0NA-0.0540.142-0.036-0.048NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▇▅▆▅▅▄▁▇▇█-2.843-18.205-11.086-23.567-15.714-27.475-61.6794.3134.95611.893NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss ▆▅▅▆▅▄▁▇████████▇▇▇▇▇▇▇▇▇█▇▆▆▆▆▆▆▇▇▆▇▇▇▇██▇-4.74-17.276-17.266-10.468-19.323-22.643-56.7544.80311.6488.1226.8958.75510.4310.436.7636.7632.0890.2692.607-1.9111.9491.113-0.072-2.740.3747.5194.163-3.347-6.45-10.82-4.045-12.103-5.161-1.749-2.109-3.2240.7193.3765.056.5749.4287.6116.698
us-gaap:ComprehensiveIncomeNetOfTax ▇▅▆▅▅▄▁▇▇███-2.843-18.205-11.032-23.709-15.678-27.427-61.4314.3134.95611.8937.12411.343NA13.73NA10.741-6.7240.8252.2510.5770.678-3.0092.661-11.138-8.187-1.113.659-3.018-3.443-6.17-2.888-16.049-3.2070.429-7.073-0.597-1.825-1.4455.71213.462NANANA
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest 0.0NA-0.0540.142-0.036-0.044NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
  2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
  2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
us-gaap:Assets ▇▇▇▇███▁▁▁▁▁1066.5831072.1551077.711071.6091103.5041106.1971134.002443.006435.771422.718420.457404.464NA401.344NA378.767345.512347.488347.496352.814345.346332.486336.779335.482348.818365.372356.098342.094345.423341.12348.237346.998334.873348.575347.955356.025361.608371.084371.891NA366.043NANA
us-gaap:LiabilitiesAndStockholdersEquity ▇▇▇▇███▁▁▁▁▁1066.5831072.1551077.711071.6091103.5041106.1971134.002443.006435.771422.718420.457404.464NA401.344NA378.767345.512347.488347.496352.814345.346332.486336.779335.482348.818365.372356.098342.094345.423341.12348.237346.998334.873348.575347.955356.025361.608371.084371.891NA366.043NANA
us-gaap:StockholdersEquity ▆▆▆▇▇██▂▂▂▁▁466.758464.884483.072491.753514.805528.67546.243309.007304.463298.352289.091278.797NA264.548NA245.356235.469240.963239.837236.966238.137236.326239.167234.887247.068254.331254.268249.387253.16256.185262.456264.373280.899283.613283.659290.247291.031292.626294.463NA274.725NANA
  2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
us-gaap:AssetsCurrent ▇▇▆▆▇▇█▂▂▂▂▁456.25453.799439.696431.595442.807444.846485.239322.286316.446297.506297.438279.571NA276.451NA253.785245.149240.833239.585243.032234.463206.695208.733207.945214.817221.891203.81186.059186.848183.858195.069193.193221.083234.389234.751237.372243.816248.51244.306NA240.217NANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▇█▆▅▄▇▇█▂▁▃▂162.728171.474155.194145.094143.014159.521164.921170.695127.008115.136134.286121.984NA92.472NA83.83696.045109.217108.713104.945115.3789.2672.58868.60970.88560.57857.96940.04351.66846.24847.4441.393102.80875.6359.19350.46653.26251.14649.38848.80945.92132.84541.13
us-gaap:InventoryNet █▇▇▇█▇█▂▂▂▁▁141.811134.859130.706133.923137.229130.744139.31463.82463.13662.67662.08556.411NA60.347NA54.52345.50248.16750.81554.64451.34850.8753.21358.37155.54560.1461.46462.45458.97760.36167.66673.30162.33268.68572.96682.19582.68984.18576.656NA63.224NANA
us-gaap:OtherAssetsCurrent ▁▅▃▃▂▁▂▆█▇▆▆0.9535.9983.1582.6691.1440.2581.6828.64310.9869.9248.6138.288NA11.344NA10.9178.5937.1728.1378.6576.2615.6678.0918.7919.18NANANANANANANANANANANANANANANANANANA
  2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
us-gaap:PropertyPlantAndEquipmentGross ▇▇███▇█▁▁▁▁▁110.789108.272114.139115.554116.795113.093113.96168.78768.13468.61467.12966.821NA64.156NA62.61247.20347.21946.50245.6145.46673.31674.95283.88185.23786.18886.93889.44789.02887.33485.64684.59883.42382.76782.34982.73981.19982.50484.624NA84.804NANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment █▇▇██▆▅▃▂▂▁▁44.98443.58443.22745.11545.01941.30139.62935.86534.59733.49232.95732.558NA31.313NA30.24528.96928.40727.83726.96226.46641.37243.99453.12753.38352.82752.64953.78752.80251.41950.04548.89547.95947.09846.79245.55644.21844.25745.618NA45.0NANA
us-gaap:AmortizationOfIntangibleAssets ▇▇▇▇▇▇█▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁9.5279.5389.6159.9699.98710.01911.61.01.01.10.70.70.61.00.71.11.51.81.81.81.71.71.71.81.892.02.12.12.0822.61.71.71.0571.01.0NA1.0451.1NANANANANA
us-gaap:PropertyPlantAndEquipmentNet ▇▆▇▇███▁▁▁▁▁65.80564.68870.91270.43971.77671.79274.33232.92233.53735.12234.17234.263NA32.843NA32.36718.23418.81218.66518.64819.031.94430.95830.75431.85433.36134.28935.6636.22635.91535.60135.70335.46435.66935.55737.18336.98138.24739.006NA39.804NANA
us-gaap:Goodwill ███████▁▁▁▁▁238.95237.997238.669235.903241.466239.27242.12764.57964.76566.78465.61365.483NA66.038NA63.04858.84961.02860.75360.81460.26460.8661.29560.32663.13267.86571.07571.37571.31370.89576.85376.26558.75657.95757.10659.06658.0659.47861.361NA58.498NANA
 us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass cohu:InProcessTechnology▁▁█16.916.920.8NANANA36.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▆▇▇▇███▁▁▁▁▁252.208261.316275.019282.488297.211305.306318.96113.51214.49916.13116.74817.766NA18.742NA22.09717.83520.33822.08523.7825.29727.36730.1631.03633.08736.47241.10143.39145.31546.68239.83841.13418.97719.61119.27821.46421.82823.78926.166NA26.523NANA
us-gaap:OperatingLeaseRightOfUseAsset ▃▅▅▇█▁31.46932.59933.26934.09635.22429.782NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ██▇▆▅▅▄▂▁▁▁▁21.90121.75620.0316.95814.95515.10713.2649.7076.5247.1756.4867.381NA7.27NA7.475.4456.4776.4086.546.3225.625.6335.4215.9285.7835.8235.6095.7213.770.8760.7030.5930.9491.2630.940.9231.061.052NA1.001NANA
  2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
us-gaap:LiabilitiesCurrent ██▇▆▇▆█▂▂▁▂▁159.041163.717148.885139.349146.931138.089160.58989.92586.54878.15185.26777.162NA85.621NA81.50268.68963.5364.5372.08663.19163.16763.7666.74669.55381.27771.10861.57461.01155.15758.42654.6436.3847.00846.43247.33451.87159.04557.541NA71.534NANA
us-gaap:LongTermDebtCurrent █▂▂▁▁▂▂7.9196.5666.5176.3826.4876.5826.676NANANA4.388NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccountsPayableCurrent █▆▅▅▇▅▅▃▄▄▃▁60.01253.45748.69748.12654.45346.99948.11739.7741.37340.9737.55629.907NA40.507NA37.72731.44425.69928.45533.1727.2925.84828.68130.47725.96434.42632.15626.94726.02318.7621.59418.38313.21718.4315.18516.42118.62522.46519.34NA18.198NANA
us-gaap:OtherAccruedLiabilitiesCurrent ▄▄█▆▆▆█▂▂▁▁▁26.97929.08951.89938.91139.73238.96650.04515.98514.5429.95910.09810.526NA11.322NA12.499.9329.1378.93310.1018.5636.1346.0996.5717.1848.027.5287.8627.8158.3018.3889.1264.9526.7097.6068.4328.4546.9735.581NA6.973NANA
us-gaap:AccruedIncomeTaxesCurrent ▄█▃▄▄▅▇▄▃▁▁▂5.57111.7953.8946.2666.0367.83111.0556.0723.9051.5462.1592.725NA2.22NA2.0891.921.7871.4184.4124.1954.964.5163.7323.1332.2641.0530.8460.8051.5151.972.0111.1092.5653.2663.122.5182.4573.856NA8.802NANA
us-gaap:OperatingLeaseLiabilityCurrent 5.462NA5.458NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ContractWithCustomerLiabilityCurrent ▅█▁▄▄▃▂17.74826.5947.616.216.713.910.8NANANA10.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
 us-gaap:LongTermDebt us-gaap:DebtInstrument cohu:KitaTermLoans▁▁▂▃▅▆█3.73.73.84.04.24.34.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument cohu:SecuredTermLoanFacility▁▃▄▃▅▆█337.9338.5339.1338.8339.4340.0340.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument cohu:XcerraTermLoan▁▃▄▄█1.31.41.51.51.7NA1.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType cohu:LoanFacilities,us-gaap:ConstructionLoans█▄▁8.46.65.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebtNoncurrent █▇▆▄▁▂▃348.036346.877346.518344.92341.978342.632343.428NANANA4.575NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet ▁▄█27.61629.29731.31NANANA38.942NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▁▅█27.23428.10328.877NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
us-gaap:StockholdersEquity ▆▆▆▇▇██▂▂▂▁▁466.758464.884483.072491.753514.805528.67546.243309.007304.463298.352289.091278.797NA264.548NA245.356235.469240.963239.837236.966238.137236.326239.167234.887247.068254.331254.268249.387253.16256.185262.456264.373280.899283.613283.659290.247291.031292.626294.463NA274.725NANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest ▆▆▆▇▇██▂▁▁▁466.758464.884483.072491.397514.449528.314545.944309.007304.463298.352289.091NANANANANA235.469NANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CommonStockValue ██████▇▁▁▁▁▁41.86241.68641.39541.26541.141.01540.76328.90128.88328.79628.48928.213NA27.889NA27.27826.84226.71226.67726.58626.2426.12826.10825.90825.69225.53525.39825.24825.0824.94224.90824.71324.63224.48324.47324.36324.3324.16124.146NA23.989NANA
us-gaap:AdditionalPaidInCapitalCommonStock ███████▁▁▁▁▁439.943435.402433.19428.428425.609421.381419.69130.194128.248125.448127.663123.064NA118.799NA112.274111.95108.995107.127104.998105.516102.922101.20798.22197.93895.63293.06490.46789.88388.09986.73884.46883.54781.72780.74378.89977.65876.1475.098NA71.799NANA
us-gaap:RetainedEarningsAccumulatedDeficit ▁▁▂▃▄▅▅██▇▇▇18.01522.75542.51762.3275.11596.938111.67171.11168.04158.124150.726145.536NA138.464NA129.708124.559124.34125.673124.666128.153127.777128.231129.87134.152135.317129.33126.692131.546139.5151.816157.355170.937177.574180.792184.37189.055189.793187.866NA179.134NANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▃▂▃▁▅▄▅▆▆█▇▇-33.062-34.959-34.03-40.26-27.019-30.664-25.88-21.198-20.708-14.016-17.787-18.016NA-20.604NA-23.904-27.882-19.084-19.64-19.284-21.772-20.501-16.379-19.112-10.714-2.1536.4766.986.6513.644-1.006-2.1631.783-0.171-2.3492.615-0.0122.5327.353NA-0.197NANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue ▂▂▂▂▂▂█▁▁▁3.4033.6113.2873.5063.6623.69312.7841.8791.9481.669NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
us-gaap:NetCashProvidedByUsedInOperatingActivities ▂▆▆▄▁▄▄▇▆▁▆█-4.52417.81313.8318.211-9.4934.725.2323.29215.192-9.27716.14126.401NA4.41NA-7.2026.00112.5857.421-1.459-3.0820.81-0.4654.21514.6596.0437.918-8.9421.5390.4547.927-6.5032.3824.9415.1710.6755.7033.855-4.7457.4258.4131.637NA
us-gaap:NetCashProvidedByUsedInInvestingActivities NA1.465NA-4.242-4.065-3.521NA22.725-0.073-4.319-6.3483.146NA-0.317NA-3.525-13.172-11.227-0.511-8.00629.754-1.4883.794-1.0260.015-1.0510.166-0.4943.989-1.069-0.698-53.54826.18712.0565.954-3.031-1.1630.6255.693-5.9615.122-10.915NA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▁▁▁▁▁█▁▁▁▁▁-0.336-2.2460.2660.154-3.312-5.291331.673-1.937-1.104-6.5271.170.616NA3.392NA-3.033-0.634-1.365-2.74-1.968-0.535-1.469-0.209-2.769-0.863-0.441-0.603-2.269-1.08-1.285-0.368-0.419-2.423-1.354-0.759-1.227-1.141-1.314-0.564-0.845-0.6320.108NA
us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease NA15.544NANANA-4.58-5.77443.68711.872-19.1512.30229.512NA8.636NA-12.209-13.1720.5043.768-10.42526.1116.6723.979-2.27610.3072.60917.926-11.6255.42-1.1926.047-61.41527.17816.4378.727-2.7962.1161.7580.5792.88813.076-8.285NA
  2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
us-gaap:NetCashProvidedByUsedInOperatingActivities ▂▆▆▄▁▄▄▇▆▁▆█-4.52417.81313.8318.211-9.4934.725.2323.29215.192-9.27716.14126.401NA4.41NA-7.2026.00112.5857.421-1.459-3.0820.81-0.4654.21514.6596.0437.918-8.9421.5390.4547.927-6.5032.3824.9415.1710.6755.7033.855-4.7457.4258.4131.637NA
us-gaap:NetIncomeLoss ▆▅▅▆▅▄▁▇████████▇▇▇▇▇▇▇▇▇█▇▆▆▆▆▆▆▇▇▆▇▇▇▇██▇-4.74-17.276-17.266-10.468-19.323-22.643-56.7544.80311.6488.1226.8958.75510.4310.436.7636.7632.0890.2692.607-1.9111.9491.113-0.072-2.740.3747.5194.163-3.347-6.45-10.82-4.045-12.103-5.161-1.749-2.109-3.2240.7193.3765.056.5749.4287.6116.698
us-gaap:ProfitLoss ▆▅▅▆▅▄▁▇█████-4.74-17.276-17.32-10.326-19.359-22.687-56.9974.80311.6488.1226.8958.75510.43NA6.763NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DepreciationDepletionAndAmortization ▆▆▆▆▆▆█▁▁▁▁▁13.08212.95613.51815.2115.09915.04418.7712.4022.4172.4572.4642.392NA2.137NA2.2022.3232.7242.6962.6692.742.7572.8632.9133.2993.3543.4233.4523.3923.8583.0883.1312.3152.2122.4342.4422.4712.3832.4442.7692.8522.561NA
us-gaap:IncreaseDecreaseInAccountsReceivable ▇▁▅▃▆▁▂▂▇█▄▂10.639-17.0780.607-7.0112.911-17.657-13.877-13.1978.13713.152-5.754-14.093NA7.326NA15.787.69-5.884-2.4475.2583.89-11.7915.102-6.171-12.89916.9845.1986.2012.59-2.2323.877-1.733-6.6351.3895.937-5.67-8.115-3.289-4.434-9.039-0.3212.064NA
us-gaap:IncreaseDecreaseInInventories █▇▃▃▇▂▁▄▄▄▇▂7.0636.067-0.686-1.8394.974-2.475-4.5981.1591.0580.3385.495-2.856NA4.827NA4.73-1.057-2.506-3.5632.5180.47-0.4091.2164.466-4.158-0.212.683.538-1.35-7.412-5.51.21-6.429-4.18-9.229-0.059-1.0087.8489.0524.973-1.6334.275NA
us-gaap:DeferredIncomeTaxExpenseBenefit ▅▅█▆▃▅▁▆▆▇▄▆-2.149-2.7062.313-0.238-4.966-2.494-7.954-0.739-0.020.506-2.8590.054NA-0.275NA-0.7110.046-0.371-0.205-0.5351.3080.063-0.368-0.7810.819-0.583-0.308-0.415-0.567-0.296-0.043-0.7510.8430.086-0.325-0.023-0.263-0.728-0.254-0.431-0.666-0.629NA
us-gaap:ShareBasedCompensation ▁█3.4033.611NA3.5063.6623.69312.7821.881.9481.6691.6711.86NA1.759NA1.7171.8671.6681.6511.9571.6741.6371.7151.7291.7951.6221.6871.5171.5061.1861.3241.4211.3670.9591.2511.0441.3780.9230.9381.0481.00.962NA
  2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
us-gaap:NetCashProvidedByUsedInInvestingActivities NA1.465NA-4.242-4.065-3.521NA22.725-0.073-4.319-6.3483.146NA-0.317NA-3.525-13.172-11.227-0.511-8.00629.754-1.4883.794-1.0260.015-1.0510.166-0.4943.989-1.069-0.698-53.54826.18712.0565.954-3.031-1.1630.6255.693-5.9615.122-10.915NA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment █▂▆▆▆▅▃▁▁▂▂▃6.3791.5844.6534.954.8713.5262.4950.6120.7861.0741.3542.324NA0.985NA1.430.6551.030.8720.8952.8991.4881.1281.0710.4190.1350.3760.731.3951.261.0440.2090.8511.1270.3320.9570.1230.8580.2450.1871.1931.395NA
  2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▁▁▁▁▁█▁▁▁▁▁-0.336-2.2460.2660.154-3.312-5.291331.673-1.937-1.104-6.5271.170.616NA3.392NA-3.033-0.634-1.365-2.74-1.968-0.535-1.469-0.209-2.769-0.863-0.441-0.603-2.269-1.08-1.285-0.368-0.419-2.423-1.354-0.759-1.227-1.141-1.314-0.564-0.845-0.6320.108NA
 us-gaap:ProceedsFromIssuanceOfLongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType cohu:SecondFacility,us-gaap:ConstructionLoans▁█1.62.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsOfDividendsCommonStock ██████▂▂▁▂▁▁2.4882.4832.4682.4662.452.4431.7321.7331.7121.7721.6831.673NA1.615NA1.6061.6031.61.5751.5731.5671.5661.5431.5391.5321.5241.5071.5041.4961.494NANA2.9451.4681.4621.4581.451.4481.4431.4361.4321.423NA
  2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:LongtermDebtType cohu:ThirdFacility,us-gaap:ConstructionLoans1.2e-08NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:Range cohu:KitaTermLoans,srt:MaximumNA4.3e-094.3e-094.4000000000000005e-094.5e-094.5e-094.5e-09NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:Range,us-gaap:DebtInstrument srt:Maximum,cohu:KitaTermLoans4e-09NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:Range,us-gaap:DebtInstrument srt:Minimum,cohu:KitaTermLoans5e-10NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA

None

us-gaap:CommonStockValue

us-gaap:CommonStockValue


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value4141414141414028282828282727262626262626262525252525252424242424242424242423
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.93.93.83.93.73.73.66.56.66.86.87.06.97.27.87.77.77.57.67.97.87.77.47.07.17.47.37.37.27.17.47.07.06.86.76.56.56.6

None

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value4141414141414028282828282727262626262626262525252525252424242424242424242423
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesOutstanding


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value4141414141414028282828282727262626262626262525252525252424242424242424242423
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-302018-09-292018-06-302018-03-312017-09-302017-06-242017-03-252016-09-242016-06-252016-03-262015-09-262015-06-272015-03-282014-09-272014-06-282014-03-292013-09-282013-06-292013-03-302012-09-292012-06-302012-03-312011-09-242011-06-252011-03-262010-09-252010-06-26
Value41414141402929292928282727262626252625252424242424242424242424
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-302018-09-292018-06-302018-03-312017-09-302017-06-242017-03-252016-09-242016-06-252016-03-262015-09-262015-06-272015-03-282014-09-272014-06-282014-03-292013-09-282013-06-292013-03-302012-09-292012-06-302012-03-312011-09-242011-06-252011-03-262010-09-252010-06-26
Value41414141402828282827262626262626252525252424242424242424242323
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-302018-09-292018-06-302018-03-312017-09-302017-06-242017-03-252016-06-252015-09-262015-06-272014-09-272014-06-282011-09-242011-06-25
Value286000.058000.0459000.0610000.0393000.003000.034000.05000.046000.0258000.0773000.0857000.0843000.01346000.02231000.02085000.02035000.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
Value-0.11-0.42-0.42-0.25-0.47-0.55-1.40.170.40.280.240.310.380.380.250.250.080.010.1-0.070.070.040-0.110.010.30.16-0.13-0.26-0.43-0.16-0.49-0.21-0.07-0.09-0.130.030.140.210.270.40.320.28
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
Value-0.11-0.42-0.42-0.25-0.47-0.55-1.40.160.390.280.230.30.360.360.240.240.080.010.1-0.070.070.040-0.110.010.290.16-0.13-0.26-0.43-0.16-0.49-0.21-0.07-0.09-0.130.030.140.210.270.390.320.28
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-30
Value-0.11-0.42-0.39-0.25-0.47-0.56-1.40.170.40.280.240.310.390.390.250.250.090.010.1-0.070.090.050.15-0.110.050.280.04-0.13-0.27-0.44-0.17-0.5
Percentage of IncomeLossFromContinuingOperationsPerBasicShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-30
Value-0.11-0.42-0.39-0.25-0.47-0.56-1.40.160.390.280.230.30.370.370.240.240.080.010.1-0.070.080.050.15-0.110.050.270.04-0.13-0.27-0.44-0.17-0.5
Percentage of IncomeLossFromContinuingOperationsPerDilutedShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
Value144138142143150147170869995849393938181706976656367756896947768645966565057595366718089968674
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

cohu:Nonsystems, cohu:PCBTest


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-30
Value4.5474.0684.5293.8254.0254.144
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.22.93.22.72.72.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.22.93.22.72.72.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax cohu:Nonsystems cohu:PCBTest100.0100.0100.0100.0100.0100.0

cohu:Nonsystems, cohu:SemiconductorTestAndInspection


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value57576162615665434440
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax39.841.443.043.340.938.438.450.944.242.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax39.841.443.043.340.938.438.450.944.242.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax cohu:Nonsystems cohu:SemiconductorTestAndInspection100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cohu:Systems, cohu:PCBTest


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-30
Value8.1096.843.6966.8538.4076.972
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax5.64.92.64.85.64.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax5.64.92.64.85.64.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax cohu:Systems cohu:PCBTest100.0100.0100.0100.0100.0100.0

cohu:Systems, cohu:SemiconductorTestAndInspection


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value74707270767996425554
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax51.450.851.249.250.854.156.749.155.857.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax51.450.851.249.250.854.156.749.155.857.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax cohu:Systems cohu:SemiconductorTestAndInspection100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:StatementBusinessSegments

cohu:PCBTest


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-30
Value12108.225101211
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax8.87.95.87.48.37.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax8.87.95.87.48.37.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax cohu:PCBTest100.0100.0100.0100.0100.0100.0

cohu:SemiconductorTestAndInspection


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value131128133132137136162869995
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax91.292.194.292.691.792.595.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax91.292.194.292.691.792.595.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax cohu:SemiconductorTestAndInspection100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:StatementGeographical

cohu:Malaysia1


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value11151412161723131311
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax8.210.99.99.111.312.013.615.913.112.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax8.210.99.99.111.312.013.615.913.112.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax cohu:Malaysia1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cohu:RestOfTheWorld


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value44494644525985264238
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax31.136.033.031.234.840.550.330.342.140.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax31.136.033.031.234.840.550.330.342.140.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax cohu:RestOfTheWorld100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

country:CN


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value31303031322327231920
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax21.622.221.721.721.815.916.027.419.221.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax21.622.221.721.721.815.916.027.419.221.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax country:CN100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

country:PH


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value13101312111414119.91610
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.27.29.48.67.69.88.712.99.911.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.27.29.48.67.69.88.712.99.911.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax country:PH100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

country:TW


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value221323201714135.9162.9052.941
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax15.610.016.314.211.510.17.86.92.93.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax15.610.016.314.211.510.17.86.92.93.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax country:TW100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

country:US


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value20191321191719111514
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax14.313.79.515.312.911.611.413.415.715.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax14.313.79.515.312.911.611.413.415.715.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax country:US100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization

us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization


None
Period End2020-06-272020-03-282019-06-292019-03-30
Value83828793
Percentage of CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax57.759.658.463.2

None

us-gaap:CostDepreciationAmortizationAndDepletion

us-gaap:CostDepreciationAmortizationAndDepletion


None
Period End2020-06-272020-03-282019-06-292019-03-30
Value7256.07266000.07625.07641000.0
Percentage of CostDepreciationAmortizationAndDepletion100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.05.20.05.2

None

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
Value14415215514916416523179868579838273676872676165716994857671717167685660615765697582867765
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.4109.8109.6104.2109.8112.2135.492.186.289.594.588.987.690.195.798.695.6102.696.596.694.5102.597.890.098.7105.0110.0119.9100.7123.1111.2104.5103.5107.098.296.392.891.589.289.888.1

None

us-gaap:ResearchAndDevelopmentExpense

us-gaap:ResearchAndDevelopmentExpense


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
Value20222020222222111111119.6099.4669.776108.6348.3057.8038.2068.6057.7319.629109.6791011111111139.9779.1368.6888.379.0398.8249.2849.0839.7418.7999.012
Percentage of ResearchAndDevelopmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax14.216.214.714.314.715.413.212.911.112.414.110.310.112.114.312.510.911.912.912.710.314.110.610.213.116.318.219.416.824.019.715.814.615.713.612.311.510.110.110.212.0

None

us-gaap:GeneralAndAdministrativeExpense us-gaap:ConsolidationItems

us-gaap:GeneralAndAdministrativeExpense

us-gaap:CorporateNonSegment


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value0.8483.4512.4832.0761.5483.741143.1625.1992.122
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.62.51.71.41.02.58.83.75.22.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.00.00.00.0

None

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:SellingGeneralAndAdministrativeExpense


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
Value303334333638451616171716161412131513131113131414141613141315121111101111111212129.489
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax21.524.024.323.524.325.926.919.216.718.721.318.017.117.817.519.619.720.320.717.718.420.314.714.918.323.521.124.819.826.924.420.118.620.416.816.514.113.512.614.512.7

None

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
Value-0.528-13.626-13.659-6.023-14.662-17.984-60.3716.77913104.66610118.023.0370.9963.364-1.7322.2252.2664.16-1.7052.0699.4081.045-3.418-6.466-11.96-4.896-12.929-5.705-2.607-2.065-3.7071.2052.665.8297.642108.7818.927
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.4-9.8-9.6-4.2-9.8-12.2-35.47.913.810.55.511.112.49.94.31.44.4-2.63.53.45.5-2.52.210.01.3-5.0-10.0-19.9-7.3-23.1-11.2-4.5-3.5-7.01.83.77.28.510.810.211.9

None

us-gaap:InterestExpense

us-gaap:InterestExpense


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value3.4564.4274.7675.05.2825.5074.9440.0110.0110.011
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.43.23.43.53.53.72.90.00.00.0

None

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-30
Value3.5347.3080.0264.7324.9585.13
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.55.30.03.33.33.5

None

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282012-09-292012-06-302011-09-242011-06-25
Value3.4033.6113.2873.5063.6623.6934.5561.881.9481.6691.6711.861.7591.7171.8671.6681.6511.9571.6741.6371.7461.6981.7551.5851.6130.9591.2510.9230.938
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.42.62.32.42.42.52.72.22.01.82.02.01.92.12.62.42.23.02.62.42.32.51.81.72.11.72.11.31.2

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:IncomeStatementLocation

us-gaap:CostOfSales


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-28
Value0.2110.2120.1910.2120.2080.1250.1380.1250.1620.1210.0960.1230.1210.0830.1340.160.170.0930.1530.10.1980.1150.1410.0850.19
Percentage of AllocatedShareBasedCompensationExpense6.25.95.86.05.73.43.06.68.37.25.76.66.94.87.29.610.34.89.16.111.36.88.05.411.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.10.20.10.10.10.10.10.10.20.10.10.10.10.10.20.20.20.10.20.10.30.20.10.10.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:CostOfSales0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ResearchAndDevelopmentExpense


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-28
Value0.8280.8330.760.820.7760.6380.6190.3540.3950.3490.1980.2780.2620.3160.2940.2880.2940.4160.2510.2560.2540.3310.4940.4530.422
Percentage of AllocatedShareBasedCompensationExpense24.323.123.123.421.217.313.618.820.320.911.814.914.918.415.717.317.821.315.015.614.519.528.128.626.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.60.60.50.60.50.40.40.40.40.40.20.30.30.40.40.40.40.60.40.40.30.50.50.50.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ResearchAndDevelopmentExpense0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:SellingGeneralAndAdministrativeExpenses


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-28
Value2.3642.5662.3362.4742.6782.933.7991.4011.3911.1991.3771.4591.3761.3181.4391.221.1871.6071.271.2811.2941.2521.121.0471.001
Percentage of AllocatedShareBasedCompensationExpense69.571.171.170.673.179.383.474.571.471.882.478.478.276.877.173.171.982.175.978.374.173.763.866.162.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.61.81.61.71.82.02.21.61.41.31.61.61.51.62.01.81.62.42.01.91.71.81.21.11.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:SellingGeneralAndAdministrativeExpenses0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:IncomeLossFromContinuingOperations

us-gaap:IncomeLossFromContinuingOperations


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-30
Value-4.74-17.318-16.281-10.48-19.383-22.851-57.1164.803118.1226.8958.75510106.7636.7632.3060.2182.662-1.9112.291.3353.887-2.741.3376.9210.931-3.354-6.578-11.113-4.334-12.235
Percentage of IncomeLossFromContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-3.3-12.5-11.5-7.3-12.9-15.5-33.55.611.78.58.29.311.411.48.38.33.30.33.5-2.93.62.05.2-4.01.47.31.2-4.9-10.2-18.5-6.5-21.8

None

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
Value-4.603-18.31-19.524-9.203-20.299-23.051-63.3827.10514104.86610118.1213.2061.0673.423-1.6892.252.2754.164-1.6992.0749.4141.05-3.403-6.454-11.944-4.88-12.919-5.658-1.868-1.976-3.6151.3072.7745.9457.752108.9089.065
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-3.2-13.2-13.7-6.4-13.5-15.6-37.18.214.110.85.811.312.610.04.51.54.5-2.63.53.45.5-2.52.210.01.3-5.0-10.0-19.9-7.3-23.1-11.2-3.2-3.3-6.82.03.97.38.611.010.412.1

None

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
Value0.137-0.992-3.2431.277-0.916-0.2-6.2662.3022.4682.127-2.0291.8371.0781.3580.9150.8490.7610.222-0.040.940.2771.0410.7372.4930.119-0.056-0.004-1.124-0.546-0.816-0.497-0.1190.133-0.3910.588-0.6020.8951.1781.1921.2972.367
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.1-0.7-2.30.9-0.6-0.1-3.72.72.52.2-2.42.01.11.71.31.21.00.3-0.11.40.41.50.82.60.2-0.1-0.0-1.9-0.8-1.5-1.0-0.20.2-0.70.9-0.81.11.31.21.53.2

None

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292011-12-312011-09-242010-12-252010-09-25
Value1.4130.691.6672.5856.8933.7972.6940.9410.112.4983.354-0.0211.4492.3120.8310.8164.9130.2480.1610.120.169-0.703-0.0050.3850.2810.310.2350.1860.137-1.458-0.1220.5990.631.3511.1830.893
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.00.51.21.84.62.61.61.10.12.64.0-0.01.52.91.21.26.40.40.30.20.2-1.0-0.00.40.40.50.40.30.2-2.6-0.21.00.91.91.21.0

None

us-gaap:ProfitLoss

us-gaap:ProfitLoss


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-04-01
Value-4.74-17.276-17.32-10.326-19.359-22.687-56.9974.803118.1226.8958.755106.763
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-3.3-12.4-12.2-7.2-12.9-15.3-33.45.611.78.58.29.311.18.3

None

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-24
Value1.897-0.9297.328-13.2763.684-5.262-5.47-0.475-6.8143.8541.372.573.3594.046-8.5130.561-0.3422.505-1.246-4.2212.81-8.343-5.475-8.537-0.380.2851.5074.6351.13-4.0021.9692.132-4.9952.583-3.718-4.854
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.3-0.75.2-9.32.5-3.6-3.2-0.6-6.84.11.62.73.65.0-12.00.8-0.43.8-2.0-6.33.7-12.3-5.7-9.0-0.50.42.37.71.7-7.13.93.7-8.44.8-5.6-6.8

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


None
Period End2020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value-0.9297.328-13.2763.684-5.258-5.47-0.475-6.8143.854
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.099.9100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.75.2-9.32.5-3.6-3.2-0.6-6.84.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.0

None

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value1.897-0.9296.234-13.2413.645-4.788-4.682-0.49-6.6923.771
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.3-0.74.4-9.22.4-3.2-2.7-0.6-6.74.0

None

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest


None
Period End2020-06-272019-12-282019-09-282019-06-292019-03-30
Value0-54000.0142000.0-36000.0-48000.0
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest0.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.0-0.00.1-0.0-0.0

None

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value-2.843-18.205-11.086-23.567-15.714-27.475-61.6794.3134.95611
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-2.0-13.1-7.8-16.4-10.5-18.6-36.15.05.012.5

None

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
Value-4.74-17.276-17.266-10.468-19.323-22.643-56.7544.803118.1226.8958.75510106.7636.7632.0890.2692.607-1.9111.9491.113-0.072-2.740.3747.5194.163-3.347-6.45-10.82-4.045-12.103-5.161-1.749-2.109-3.2240.7193.3765.056.5749.4287.6116.698
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-3.3-12.4-12.2-7.3-12.9-15.3-33.35.611.78.58.29.311.111.18.38.33.00.43.4-2.93.11.6-0.1-4.00.48.05.3-4.9-10.0-18.0-6.1-21.6-10.2-3.0-3.6-6.01.14.76.27.39.78.88.9

None

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-26
Value-2.843-18.205-11.032-23.709-15.678-27.427-61.4314.3134.956117.124111310-6.7240.8252.2510.5770.678-3.0092.661-11.138-8.187-1.113.659-3.018-3.443-6.17-2.888-16.049-3.2070.429-7.073-0.597-1.825-1.4455.71213
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-2.0-13.1-7.8-16.5-10.5-18.6-36.05.05.012.58.512.114.613.2-9.51.22.90.91.1-4.53.5-16.4-8.5-1.24.7-4.4-5.3-10.3-4.3-28.7-6.30.7-11.9-1.1-2.7-2.07.115.0

None

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest


None
Period End2020-06-272019-12-282019-09-282019-06-292019-03-30
Value0-54000.0142000.0-36000.0-44000.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest0.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.0-0.00.1-0.0-0.0

None

us-gaap:Assets

us-gaap:Assets


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value1066107210771071110311061134443435422420404401378345347347352345332336335348365356342345341348346334348347356361371371366
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-302016-12-31
Value554618151522345254
Percentage of Assets5.24.41.71.51.42.03.012.415.6
Percentage of Assets5.24.41.71.51.42.03.012.415.6
Percentage of Assets us-gaap:CorporateNonSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:StatementBusinessSegments

cohu:PCBTest


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-29
Value61585657626057
Percentage of Assets5.85.55.35.45.65.55.1
Percentage of Assets5.85.55.35.45.65.55.1
Percentage of Assets cohu:PCBTest100.0100.0100.0100.0100.0100.0100.0

cohu:SemiconductorTestAndInspection


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-302016-12-31
Value948966998994102110181038368291
Percentage of Assets88.990.292.792.892.692.191.587.684.4
Percentage of Assets88.990.292.792.892.692.191.587.684.4
Percentage of Assets cohu:SemiconductorTestAndInspection100.0100.0100.0100.0100.0100.0100.0100.0100.0

cohu:SemiconductorTestAndInspectionAndPCBTest


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-302016-12-31
Value1010102510551051108310791095368291
Percentage of Assets94.895.698.098.298.297.696.687.684.4
Percentage of Assets94.895.698.098.298.297.696.687.684.4
Percentage of Assets cohu:SemiconductorTestAndInspectionAndPCBTest100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value1066107210771071110311061134443435422420404401378345347347352345332336335348365356342345341348346334348347356361371371366
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-252009-12-262008-12-27
Value466464483491514528546309304298289278264245235240239236238236239234247254254249253256262264280283283290291292294274257285
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets43.843.444.845.946.747.848.269.869.970.668.868.965.964.868.269.369.067.269.071.171.070.070.869.671.472.973.375.175.476.283.981.481.581.580.578.979.275.10.00.0

None

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value456453439431442444485322316297297279276253245240239243234206208207214221203186186183195193221234234237243248244240
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets42.842.340.840.340.140.242.872.772.670.470.769.168.967.071.069.368.968.967.962.262.062.061.660.757.254.454.153.956.055.766.067.267.566.767.467.065.765.6

None

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-262009-12-262008-12-27
Value1621711551451431591641701271151341219283961091081041158972687060574051464741102755950535149484532413830
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets15.316.014.413.513.014.414.538.529.127.231.930.223.022.127.831.431.329.733.426.821.620.520.316.616.311.715.013.613.611.930.721.717.014.214.713.813.30.012.50.00.00.00.0

None

us-gaap:InventoryNet

us-gaap:InventoryNet


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value14113413013313713013963636262566054454850545150535855606162586067736268728282847663
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets13.312.612.112.512.411.812.314.414.514.814.813.915.014.413.213.914.615.514.915.315.817.415.916.517.318.317.117.719.421.118.619.721.023.122.922.720.617.3

None

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-27
Value0.9535.9983.1582.6691.1440.2581.6828.643109.9248.6138.28811108.5937.1728.1378.6576.2615.6678.0918.7919.18
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.60.30.20.10.00.12.02.52.32.02.02.82.92.52.12.32.51.81.72.42.62.6

None

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value11010811411511611311368686867666462474746454573748385868689898785848382828281828484
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.410.110.610.810.610.210.015.515.616.216.016.516.016.513.713.613.412.913.222.122.325.024.423.624.426.125.825.624.624.424.923.723.723.222.522.222.823.2

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

us-gaap:BuildingAndBuildingImprovements


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302016-12-312015-12-262014-12-27
Value42404140393637141414137.9678.97131
Percentage of PropertyPlantAndEquipmentGross38.337.536.334.833.631.932.720.420.820.820.516.919.736.4
Percentage of Assets4.03.83.83.83.63.33.33.23.33.43.32.32.68.9
Percentage of Assets us-gaap:BuildingAndBuildingImprovements0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LandAndLandImprovements


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302016-12-312015-12-262014-12-27
Value8.7248.6511111212117.8557.9718.3318.0174.0794.60711
Percentage of PropertyPlantAndEquipmentGross7.98.010.210.310.410.810.411.411.712.111.98.610.113.8
Percentage of Assets0.80.81.11.11.11.11.01.81.82.01.91.21.33.4
Percentage of Assets us-gaap:LandAndLandImprovements0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:MachineryAndEquipment


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302016-12-312015-12-262014-12-27
Value5959616365646446454645353132
Percentage of PropertyPlantAndEquipmentGross53.854.553.454.956.057.256.968.267.567.167.574.570.138.0
Percentage of Assets5.65.55.75.95.95.85.710.610.610.910.810.29.29.3
Percentage of Assets us-gaap:MachineryAndEquipment0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value4443434545413935343332323130282827262641435353525253525150484747464544444545
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.24.14.04.24.13.73.58.17.97.97.88.07.88.08.48.28.07.67.712.413.115.815.314.514.815.715.315.114.414.114.313.513.412.812.211.912.312.3

None

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-302011-12-312011-09-24
Value9.5279.5389.6159.9699.98710111.01.01.10.70.70.61.00.71.11.51.81.81.81.71.71.71.81.892.02.12.12.0822.61.71.71.0571.01.01.01.0451.1
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value6564707071717432333534343232181818181931303031333435363535353535353736383939
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.26.06.66.66.56.56.67.47.78.38.18.58.28.55.35.45.45.35.59.69.29.29.19.19.610.410.510.510.210.310.610.210.210.410.210.310.510.9

None

us-gaap:Goodwill

us-gaap:Goodwill


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value23823723823524123924264646665656663586160606060616063677171717076765857575958596158
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets22.422.222.122.021.921.621.414.614.915.815.616.216.516.617.017.617.517.217.518.318.218.018.118.620.020.920.620.822.122.017.516.616.416.616.116.016.516.0

us-gaap:Goodwill us-gaap:ReportingUnit

cohu:PCBTest


None
Period End2020-06-272020-03-282019-12-282018-12-29
Value19191921
Percentage of Goodwill8.38.38.38.8
Percentage of Assets1.91.81.81.9
Percentage of Assets cohu:PCBTest0.00.00.00.0

cohu:SemiconductorTestAndInspection


None
Period End2020-06-272020-03-282019-12-282018-12-292017-12-302016-12-31
Value2192182182206558
Percentage of Goodwill91.791.791.791.2100.0100.0
Percentage of Assets20.520.420.319.515.617.0
Percentage of Assets cohu:SemiconductorTestAndInspection0.00.00.00.00.00.0

None

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

cohu:InProcessTechnology


None
Period End2020-06-272020-03-282019-12-282018-12-29
Value16162036
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill100.0100.0100.0100.0
Percentage of Assets1.61.61.93.2
Percentage of Assets cohu:InProcessTechnology0.00.00.00.0

None

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value25226127528229730531813141616171822172022232527303133364143454639411819192121232626
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets23.624.425.526.426.927.628.13.13.33.84.04.44.75.85.25.96.46.77.38.29.09.39.510.011.512.713.113.711.411.95.75.65.56.06.06.47.07.2

None

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-30
Value313233343529
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0
Percentage of Assets3.03.03.13.23.22.7

None

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value212120161415139.7076.5247.1756.4867.3817.277.475.4456.4776.4086.546.3225.625.6335.4215.9285.7835.8235.6095.7213.770.8760.7030.5930.9491.2630.940.9231.061.0521.001
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.12.01.91.61.41.41.22.21.51.71.51.81.82.01.61.91.81.91.81.71.71.61.71.61.61.61.71.10.30.20.20.30.40.30.30.30.30.3

None

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value15916314813914613816089867885778581686364726363636669817161615558543647464751595771
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets14.915.313.813.013.312.514.220.319.918.520.319.121.321.519.918.318.620.418.319.018.919.919.922.220.018.017.716.216.815.710.913.513.313.314.315.915.519.5

None

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-30
Value7919000.06566000.06517000.06382000.06487000.06582000.06676000.04388000.0
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.60.60.60.60.60.61.0

us-gaap:LongTermDebtCurrent us-gaap:DebtInstrument

cohu:KitaTermLoans


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-29
Value300000.0300000.0400000.0500000.0500000.0700000.0900000.0
Percentage of LongTermDebtCurrent3.84.66.17.87.710.613.5
Percentage of Assets0.00.00.00.00.00.10.1
Percentage of Assets cohu:KitaTermLoans0.00.00.00.00.00.00.0

cohu:SecuredTermLoanFacility


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-29
Value2300000.02300000.02300000.02400000.02400000.02400000.02400000.0
Percentage of LongTermDebtCurrent29.035.035.337.637.036.535.9
Percentage of Assets0.20.20.20.20.20.20.2
Percentage of Assets cohu:SecuredTermLoanFacility0.00.00.00.00.00.00.0

cohu:XcerraTermLoan


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-29
Value300000.0300000.0300000.0300000.0300000.01700000.0300000.0
Percentage of LongTermDebtCurrent3.84.64.64.74.625.84.5
Percentage of Assets0.00.00.00.00.00.20.0
Percentage of Assets cohu:XcerraTermLoan0.00.00.00.00.00.00.0

us-gaap:LongTermDebtCurrent us-gaap:DebtInstrument, us-gaap:LongtermDebtType

cohu:LoanFacilities, us-gaap:ConstructionLoans


None
Period End2020-06-272020-03-282019-12-28
Value400000.0400000.0300000.0
Percentage of LongTermDebtCurrent5.16.14.6
Percentage of Assets0.00.00.0
Percentage of Assets cohu:LoanFacilities us-gaap:ConstructionLoans0.00.00.0

None

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value6053484854464839414037294037312528332725283025343226261821181318151618221918
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.65.04.54.54.94.24.29.09.59.78.97.410.110.09.17.48.29.47.97.88.59.17.49.49.07.97.55.56.25.33.95.34.44.65.26.15.25.0

None

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value2629513839385015149.959101011129.9329.1378.933108.5636.1346.0996.5717.1848.027.5287.8627.8158.3018.3889.1264.9526.7097.6068.4328.4546.9735.5816.973
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.52.74.83.63.63.54.43.63.32.42.42.62.83.32.92.62.62.92.51.81.82.02.12.22.12.32.32.42.42.61.51.92.22.42.31.91.51.9

None

us-gaap:AccruedIncomeTaxesCurrent

us-gaap:AccruedIncomeTaxesCurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value5.571113.8946.2666.0367.831116.0723.9051.5462.1592.7252.222.0891.921.7871.4184.4124.1954.964.5163.7323.1332.2641.0530.8460.8051.5151.972.0111.1092.5653.2663.122.5182.4573.8568.802
Percentage of AccruedIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.51.10.40.60.50.71.01.40.90.40.50.70.60.60.60.50.41.31.21.51.31.10.90.60.30.20.20.40.60.60.30.70.90.90.70.71.02.4

None

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


None
Period End2020-06-272019-12-28
Value5462000.05458000.0
Percentage of OperatingLeaseLiabilityCurrent100.0100.0
Percentage of Assets0.50.5

us-gaap:OperatingLeaseLiabilityCurrent us-gaap:BalanceSheetLocation

cohu:OtherAccruedLiabilities


None
Period End2020-03-282019-12-28
Value5592000.05458000.0
Percentage of OperatingLeaseLiabilityCurrent0.0100.0
Percentage of Assets0.50.5
Percentage of Assets cohu:OtherAccruedLiabilities0.00.0

None

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:ContractWithCustomerLiabilityCurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-30
Value17267.61616131010
Percentage of ContractWithCustomerLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.72.50.71.51.51.31.02.5

None

us-gaap:LongTermDebt us-gaap:DebtInstrument

us-gaap:LongTermDebt

cohu:KitaTermLoans


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-29
Value3.73.73.84.04.24.34.6
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.40.40.40.40.4
Percentage of Assets cohu:KitaTermLoans0.00.00.00.00.00.00.0

cohu:SecuredTermLoanFacility


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-29
Value337338339338339340340
Percentage of LongTermDebt9132.49148.68923.78470.08081.07907.07404.3
Percentage of Assets31.731.631.531.630.830.730.0
Percentage of Assets cohu:SecuredTermLoanFacility0.00.00.00.00.00.00.0

cohu:XcerraTermLoan


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292018-12-29
Value1.31.41.51.51.71.8
Percentage of LongTermDebt35.137.839.537.540.539.1
Percentage of Assets0.10.10.10.10.20.2
Percentage of Assets cohu:XcerraTermLoan0.00.00.00.00.00.0

us-gaap:LongTermDebt us-gaap:DebtInstrument, us-gaap:LongtermDebtType

cohu:LoanFacilities, us-gaap:ConstructionLoans


None
Period End2020-06-272020-03-282019-12-28
Value8.46.65.5
Percentage of LongTermDebt227.0178.4144.7
Percentage of Assets0.80.60.5
Percentage of Assets cohu:LoanFacilities us-gaap:ConstructionLoans0.00.00.0

None

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-30
Value3483463463443413423434.575
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets32.632.432.232.231.031.030.31.1

None

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


None
Period End2020-06-272020-03-282019-12-282018-12-29
Value27293138
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0
Percentage of Assets2.62.72.93.4

None

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


None
Period End2020-06-272020-03-282019-12-28
Value272828
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0
Percentage of Assets2.62.62.7

None

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-252009-12-262008-12-27
Value466464483491514528546309304298289278264245235240239236238236239234247254254249253256262264280283283290291292294274257285
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets43.843.444.845.946.747.848.269.869.970.668.868.965.964.868.269.369.067.269.071.171.070.070.869.671.472.973.375.175.476.283.981.481.581.580.578.979.275.10.00.0

None

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302016-12-312015-12-31
Value466464483491514528545309304298289235238
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets43.843.444.845.946.647.848.169.869.970.668.868.20.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302016-12-312015-12-31
Value-33.062-34.959-34.03-40.26-27.019-30.664-25.88-21.198-20.708-14.016-17.787-27.882-21.772
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-7.1-7.5-7.0-8.2-5.3-5.8-4.7-6.9-6.8-4.7-6.2-11.8-9.1
Percentage of Assets-3.1-3.3-3.2-3.8-2.4-2.8-2.3-4.8-4.8-3.3-4.2-8.10.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302016-12-312015-12-31
Value439435433428425421419130128125127111105
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest94.393.789.787.282.779.876.942.142.142.044.247.544.3
Percentage of Assets41.240.640.240.038.638.137.029.429.429.730.432.40.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302016-12-312015-12-31
Value41414141414140282828282626
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest9.09.08.68.48.07.87.59.49.59.79.911.411.0
Percentage of Assets3.93.93.83.93.73.73.66.56.66.86.87.80.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-29
Value0.00.00.0-0.356-0.356-0.356-0.299
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.00.00.0-0.1-0.1-0.1-0.1
Percentage of Assets0.00.00.0-0.0-0.0-0.0-0.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302016-12-312015-12-31
Value182242627596111171168158150124128
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest3.94.98.812.714.618.320.555.455.253.052.152.953.8
Percentage of Assets1.72.13.95.86.88.89.838.638.637.435.836.10.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:CommonStockValue

us-gaap:CommonStockValue


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value4141414141414028282828282727262626262626262525252525252424242424242424242423
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.93.93.83.93.73.73.66.56.66.86.87.06.97.27.87.77.77.57.67.97.87.77.47.07.17.47.37.37.27.17.47.07.06.86.76.56.56.6

None

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value4394354334284254214191301281251271231181121111081071041051021019897959390898886848381807877767571
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets41.240.640.240.038.638.137.029.429.429.730.430.429.629.632.431.430.829.830.631.030.129.328.126.226.126.426.025.824.924.324.923.423.222.221.520.520.219.6

None

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value182242627596111171168158150145138129124124125124128127128129134135129126131139151157170177180184189189187179
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.72.13.95.86.88.89.838.638.637.435.836.034.534.236.135.836.235.337.138.438.138.738.537.036.337.038.140.943.645.351.050.952.051.852.351.150.548.9

None

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value-33062000.0-34959000.0-34030000.0-40260000.0-27019000.0-30664000.0-25880000.0-21198000.0-20708000.0-14016000.0-17787000.0-18016000.0-20604000.0-23904000.0-27882000.0-19084000.0-19640000.0-19284000.0-21772000.0-20501000.0-16379000.0-19112000.0-10714000.0-2153000.06476000.06980000.06651000.03644000.0-1006000.0-2163000.01783000.0-171000.0-2349000.02615000.0-12000.02532000.07353000.0-197000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-3.1-3.3-3.2-3.8-2.4-2.8-2.3-4.8-4.8-3.3-4.2-4.5-5.1-6.3-8.1-5.5-5.7-5.5-6.3-6.2-4.9-5.7-3.1-0.61.82.01.91.1-0.3-0.60.5-0.0-0.70.7-0.00.72.0-0.1

None

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value3.4033.6113.2873.5063.6623.693121.8791.9481.669
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value3.4033.6113.2873.5063.6623.693121.8791.9481.669
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.0

None

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value-4.52417138.211-9.4934.725.232315-9.27716264.41-7.2026.001127.421-1.459-3.0820-0.4654.215146.0437.918-8.9421.5390.4547.927-6.5032.3824.9415.1710.6755.7033.855-4.7457.4258.4131.637
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-3.112.89.75.7-6.33.23.127.015.2-9.719.228.24.7-8.98.518.29.7-2.2-4.930.8-0.66.215.26.410.2-13.12.40.811.9-11.64.78.68.71.38.65.4-5.98.38.71.9

None

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


None
Period End2020-03-282019-09-282019-06-292019-03-302018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value1.465-4.242-4.065-3.52122-0.073-4.319-6.3483.146-0.317-3.525-13.172-11.227-0.511-8.00629-1.4883.794-1.0260.015-1.0510-0.4943.989-1.069-0.698-53.54826125.954-3.031-1.1630.6255.693-5.9615.122-10.915
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.1-3.0-2.7-2.426.4-0.1-4.5-7.53.4-0.3-4.3-18.6-16.2-0.7-12.246.9-2.25.0-1.50.0-1.113.1-0.76.2-1.8-1.0-95.651.620.910.0-5.7-1.70.97.0-6.65.3-12.7

None

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value-0.336-2.2460.2660.154-3.312-5.291331-1.937-1.104-6.5271.170.6163.392-3.033-0.634-1.365-2.74-1.968-0.535-1.469-0.209-2.769-0.863-0.441-0.603-2.269-1.08-1.285-0.368-0.419-2.423-1.354-0.759-1.227-1.141-1.314-0.564-0.845-0.6320.108
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.2-1.60.20.1-2.2-3.6194.4-2.2-1.1-6.91.40.73.6-3.7-0.9-2.0-3.6-3.0-0.8-2.2-0.3-4.1-0.9-0.5-0.8-3.3-1.7-2.1-0.6-0.7-4.8-2.3-1.3-2.3-1.7-1.8-0.7-0.9-0.70.1

None

us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease

us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease


None
Period End2020-03-282019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value15-4.58-5.7744311-19.1512298.636-12.209-13.1720.5043.768-10.42526163.979-2.276102.60917-11.6255.42-1.1926.047-61.41527168.727-2.7962.1161.7580.5792.88813-8.285
Percentage of CashAndCashEquivalentsPeriodIncreaseDecrease100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax11.2-3.1-3.450.711.9-20.114.631.59.2-15.1-18.60.74.9-15.841.124.75.3-3.310.72.823.0-17.08.4-2.09.1-109.653.628.514.7-5.23.22.40.73.213.5-9.6

None

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value-4.52417138.211-9.4934.725.232315-9.27716264.41-7.2026.001127.421-1.459-3.0820-0.4654.215146.0437.918-8.9421.5390.4547.927-6.5032.3824.9415.1710.6755.7033.855-4.7457.4258.4131.637
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-3.112.89.75.7-6.33.23.127.015.2-9.719.228.24.7-8.98.518.29.7-2.2-4.930.8-0.66.215.26.410.2-13.12.40.811.9-11.64.78.68.71.38.65.4-5.98.38.71.9

None

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-06-242017-04-012017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
Value-4.74-17.276-17.266-10.468-19.323-22.643-56.7544.803118.1226.8958.75510106.7636.7632.0890.2692.607-1.9111.9491.113-0.072-2.740.3747.5194.163-3.347-6.45-10.82-4.045-12.103-5.161-1.749-2.109-3.2240.7193.3765.056.5749.4287.6116.698
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-3.3-12.4-12.2-7.3-12.9-15.3-33.35.611.78.58.29.311.111.18.38.33.00.43.4-2.93.11.6-0.1-4.00.48.05.3-4.9-10.0-18.0-6.1-21.6-10.2-3.0-3.6-6.01.14.76.27.39.78.88.9

None

us-gaap:ProfitLoss

us-gaap:ProfitLoss


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-07-012017-04-01
Value-4.74-17.276-17.32-10.326-19.359-22.687-56.9974.803118.1226.8958.755106.763
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-3.3-12.4-12.2-7.2-12.9-15.3-33.45.611.78.58.29.311.18.3

None

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value131213151515182.4022.4172.4572.4642.3922.1372.2022.3232.7242.6962.6692.742.7572.8632.9133.2993.3543.4233.4523.3923.8583.0883.1312.3152.2122.4342.4422.4712.3832.4442.7692.8522.561
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInAccountsReceivable


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value10-17.0780.607-7.0112.911-17.657-13.877-13.1978.13713-5.754-14.0937.326157.69-5.884-2.4475.2583.89-11.7915.102-6.171-12.899165.1986.2012.59-2.2323.877-1.733-6.6351.3895.937-5.67-8.115-3.289-4.434-9.039-0.3212
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:IncreaseDecreaseInInventories

us-gaap:IncreaseDecreaseInInventories


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value7.0636.067-0.686-1.8394.974-2.475-4.5981.1591.0580.3385.495-2.8564.8274.73-1.057-2.506-3.5632.5180.47-0.4091.2164.466-4.158-0.212.683.538-1.35-7.412-5.51.21-6.429-4.18-9.229-0.059-1.0087.8489.0524.973-1.6334.275
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value-2.149-2.7062.313-0.238-4.966-2.494-7.954-0.739-0.020.506-2.8590.054-0.275-0.7110.046-0.371-0.205-0.5351.3080.063-0.368-0.7810.819-0.583-0.308-0.415-0.567-0.296-0.043-0.7510.8430.086-0.325-0.023-0.263-0.728-0.254-0.431-0.666-0.629
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value3.4033.6113.5063.6623.693121.881.9481.6691.6711.861.7591.7171.8671.6681.6511.9571.6741.6371.7151.7291.7951.6221.6871.5171.5061.1861.3241.4211.3670.9591.2511.0441.3780.9230.9381.0481.00.962
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


None
Period End2020-03-282019-09-282019-06-292019-03-302018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value1.465-4.242-4.065-3.52122-0.073-4.319-6.3483.146-0.317-3.525-13.172-11.227-0.511-8.00629-1.4883.794-1.0260.015-1.0510-0.4943.989-1.069-0.698-53.54826125.954-3.031-1.1630.6255.693-5.9615.122-10.915
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.1-3.0-2.7-2.426.4-0.1-4.5-7.53.4-0.3-4.3-18.6-16.2-0.7-12.246.9-2.25.0-1.50.0-1.113.1-0.76.2-1.8-1.0-95.651.620.910.0-5.7-1.70.97.0-6.65.3-12.7

None

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value6.3791.5844.6534.954.8713.5262.4950.6120.7861.0741.3542.3240.9851.430.6551.030.8720.8952.8991.4881.1281.0710.4190.1350.3760.731.3951.261.0440.2090.8511.1270.3320.9570.1230.8580.2450.1871.1931.395
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value-0.336-2.2460.2660.154-3.312-5.291331-1.937-1.104-6.5271.170.6163.392-3.033-0.634-1.365-2.74-1.968-0.535-1.469-0.209-2.769-0.863-0.441-0.603-2.269-1.08-1.285-0.368-0.419-2.423-1.354-0.759-1.227-1.141-1.314-0.564-0.845-0.6320.108
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.2-1.60.20.1-2.2-3.6194.4-2.2-1.1-6.91.40.73.6-3.7-0.9-2.0-3.6-3.0-0.8-2.2-0.3-4.1-0.9-0.5-0.8-3.3-1.7-2.1-0.6-0.7-4.8-2.3-1.3-2.3-1.7-1.8-0.7-0.9-0.70.1

None

us-gaap:ProceedsFromIssuanceOfLongTermDebt us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:ProceedsFromIssuanceOfLongTermDebt

cohu:SecondFacility, us-gaap:ConstructionLoans


None
Period End2020-06-272020-03-282019-12-10
Value1.62.51.5
Percentage of ProceedsFromIssuanceOfLongTermDebt100.0100.0100.0

None

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value2488000.02483000.02468000.02466000.02450000.02443000.01732000.01733000.01712000.01772000.01683000.01673000.01615000.01606000.01603000.01600000.01575000.01573000.01567000.01566000.01543000.01539000.01532000.01524000.01507000.01504000.01496000.01494000.02945000.01468000.01462000.01458000.01450000.01448000.01443000.01436000.01432000.01423000.0
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentInterestRateStatedPercentage

cohu:ThirdFacility, us-gaap:ConstructionLoans


None
Period End2020-06-27
Value0.012
Percentage of DebtInstrumentInterestRateStatedPercentage100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations cohu:ThirdFacility us-gaap:ConstructionLoans0.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument, us-gaap:Range

cohu:KitaTermLoans, srt:Maximum


None
Period End2020-03-282019-12-282019-09-282019-06-292019-03-302018-12-29
Value0.00430.00430.00440.00450.00450.0045
Percentage of DebtInstrumentInterestRateStatedPercentage0.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations cohu:KitaTermLoans srt:Maximum0.00.00.00.00.00.0

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:Range, us-gaap:DebtInstrument

srt:Maximum, cohu:KitaTermLoans


None
Period End2020-06-27
Value0.004
Percentage of DebtInstrumentInterestRateStatedPercentage33.3
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:Maximum cohu:KitaTermLoans0.0

srt:Minimum, cohu:KitaTermLoans


None
Period End2020-06-27
Value0.0005
Percentage of DebtInstrumentInterestRateStatedPercentage4.2
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations srt:Minimum cohu:KitaTermLoans0.0

None

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-302018-09-292018-06-302018-03-312017-09-302017-06-242017-03-252016-09-242016-06-252016-03-282016-03-262015-09-262015-06-272015-03-282014-09-272014-06-282014-03-292013-09-282013-06-292013-03-302012-09-292012-06-302012-03-312011-09-242011-06-25
Value-0.030.054-0.1390.0450.0090.3240.1750.2080.1730.0910.1670.7960.2220.131-0.1510.4130.067-0.6130.2650.1130.0160.0940.1120.0630.0640.0670.1080.2170.151
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

us-gaap:PerformanceShares


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-302018-09-292018-06-302018-03-31
Value0200250.000167230.00088418.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.0100.00.00.0100.00.00.0100.0

us-gaap:RestrictedStockUnitsRSU


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262013-12-282013-09-282013-06-292013-03-302012-12-29
Value86990.0622760.023263.09116.0102840.0558780.0535290.01901.034466.0250340.03044.010000.040786.0299170.0-225.05617.074086.0391520.07187.012000.037500.0474310.019686.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.0311.00.00.00.0334.10.00.00.0283.10.00.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


None
Period End2020-06-272019-06-29
Value162143
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0

cohu:AmortizationOfInventoryStepupAndInventoryRelatedCharges

cohu:AmortizationOfInventoryStepupAndInventoryRelatedCharges


None
Period End2020-06-272020-03-282019-06-292019-03-30
Value0.0721.603-1.2596.504
Percentage of AmortizationOfInventoryStepupAndInventoryRelatedCharges100.0100.0100.0100.0

cohu:CapitalizedCloudComputingServiceCostsButNotYetPaid us-gaap:FiniteLivedIntangibleAssetsByMajorClass

cohu:CapitalizedCloudComputingServiceCostsButNotYetPaid

cohu:LTCapitalizedCloudComputing


None
Period End2020-03-282019-03-30
Value1370000.01515000.0
Percentage of CapitalizedCloudComputingServiceCostsButNotYetPaid100.0100.0

cohu:STCapitalizedCloudComputing


None
Period End2020-03-282019-03-30
Value182000.0329000.0
Percentage of CapitalizedCloudComputingServiceCostsButNotYetPaid13.321.7

cohu:DisposalGroupIncludingDiscontinuedOperationImpairment us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:SubsequentEventType

cohu:DisposalGroupIncludingDiscontinuedOperationImpairment

cohu:FixturesServicesBusinessFSG, us-gaap:SubsequentEvent


None
Period End2020-02-28
Value1100000.0
Percentage of DisposalGroupIncludingDiscontinuedOperationImpairment100.0

cohu:IncreaseDecreaseInAccruedCompensationWarrantyAndOtherLiabilities

cohu:IncreaseDecreaseInAccruedCompensationWarrantyAndOtherLiabilities


None
Period End2020-06-272020-03-282019-06-292019-03-30
Value6319000.0-14313000.03762000.0-9002000.0
Percentage of IncreaseDecreaseInAccruedCompensationWarrantyAndOtherLiabilities100.0100.0100.0100.0

cohu:IncreaseDecreaseInCurrentAndNoncurrentOperatingLeaseLiabilities

cohu:IncreaseDecreaseInCurrentAndNoncurrentOperatingLeaseLiabilities


None
Period End2020-06-272020-03-28
Value-1836000.0-1795000.0
Percentage of IncreaseDecreaseInCurrentAndNoncurrentOperatingLeaseLiabilities100.0100.0

cohu:IncreaseDecreaseInDeferredProfit

cohu:IncreaseDecreaseInDeferredProfit


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value315000.01619000.0-99000.0-170000.0-108000.01374000.03500000.0190000.0-1188000.0-2465000.0
Percentage of IncreaseDecreaseInDeferredProfit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cohu:IncreaseDecreaseInOperatingLeaseRightOfUseAssets

cohu:IncreaseDecreaseInOperatingLeaseRightOfUseAssets


None
Period End2020-06-272020-03-28
Value-1674000.0-1843000.0
Percentage of IncreaseDecreaseInOperatingLeaseRightOfUseAssets100.0100.0

cohu:InterestCapitalizedAssociatedWithCloudComputingImplementation

cohu:InterestCapitalizedAssociatedWithCloudComputingImplementation


None
Period End2020-06-272020-03-28
Value31000.045000.0
Percentage of InterestCapitalizedAssociatedWithCloudComputingImplementation100.0100.0

cohu:InventoryCapitalizedAsPropertyPlantAndEquipment

cohu:InventoryCapitalizedAsPropertyPlantAndEquipment


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value101000.0238000.039000.066000.079000.0116000.0343000.0365000.065000.084000.077000.0-9000.080000.042000.0059000.027000.0115000.095000.048000.064000.0108000.0242000.0917000.081000.061000.085000.00182000.0390000.00152000.00415000.0414000.0204000.0463000.0299000.01163000.0247000.0
Percentage of InventoryCapitalizedAsPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0

cohu:NumberOfMajorCustomers us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:StatementBusinessSegments

cohu:NumberOfMajorCustomers

us-gaap:SalesRevenueNet, us-gaap:CustomerConcentrationRisk, cohu:SemiconductorTestAndInspection


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-302018-09-292018-06-302018-03-31
Value-1.02.001.01.01.01.01.0
Percentage of NumberOfMajorCustomers100.0100.00.0100.0100.0100.0100.0100.0

cohu:ProceedsFromRepaymentsOfBankDebt

cohu:ProceedsFromRepaymentsOfBankDebt


None
Period End2020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value-1133000.0-219000.0-987000.0-1513000.0-1098000.0-1348000.0-289000.0-331000.0-355000.0
Percentage of ProceedsFromRepaymentsOfBankDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0

cohu:ProfitLossFromOperatingSegment

cohu:ProfitLossFromOperatingSegment


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value-0.32-10.579-12.435-2.317-13.66-14.025-43.7389.9411812
Percentage of ProfitLossFromOperatingSegment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cohu:ProfitLossFromOperatingSegment us-gaap:StatementBusinessSegments

cohu:PCBTest


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-30
Value2.0110.9940.2640.6120.741.019
Percentage of ProfitLossFromOperatingSegment-628.4-9.4-2.1-26.4-5.4-7.3

cohu:SemiconductorTestAndInspection


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value-2.331-11.573-12.699-2.929-14.4-15.044-38.5849.9411812
Percentage of ProfitLossFromOperatingSegment728.4109.4102.1126.4105.4107.388.2100.0100.0100.0

us-gaap:AllocatedShareBasedCompensationExpenseNetOfTax

us-gaap:AllocatedShareBasedCompensationExpenseNetOfTax


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-25
Value3.183.4393.1263.4393.5833.4134.1181.7651.8221.3551.571.7531.511.6421.7871.5921.5781.9171.7441.5671.6791.6851.7481.5621.6311.4761.5961.1611.3241.4211.3670.9591.2511.0441.3780.9230.938
Percentage of AllocatedShareBasedCompensationExpenseNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfFinancingCostsAndDiscounts

us-gaap:AmortizationOfFinancingCostsAndDiscounts


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-09-292018-06-302018-03-31
Value302000.0290000.0284000.0300000.0300000.0300000.0000
Percentage of AmortizationOfFinancingCostsAndDiscounts100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CapitalExpendituresIncurredButNotYetPaid


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-24
Value-1043000.03370000.0748000.0-85000.065000.0873000.0288000.0145000.0-81000.0247000.0-334000.0246000.0292000.056000.0327000.0-13000.0
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:CommonStockDividendsPerShareDeclared


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-302018-09-292018-06-302018-03-312017-09-302017-06-242017-03-252016-09-242016-06-252016-03-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-252010-06-26
Value00.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.060.06
Percentage of CommonStockDividendsPerShareDeclared0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConcentrationRiskPercentage1 us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:MajorCustomers, us-gaap:StatementBusinessSegments

us-gaap:ConcentrationRiskPercentage1

us-gaap:SalesRevenueNet, us-gaap:CustomerConcentrationRisk, cohu:OneCustomer, cohu:SemiconductorTestAndInspection


None
Period End2020-03-282019-06-292019-03-302018-09-292018-06-302018-03-31
Value0.260.120.110.1120.110.12
Percentage of ConcentrationRiskPercentage1100.0100.0100.0100.0100.0100.0

us-gaap:DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax

us-gaap:DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax


None
Period End2020-06-272020-03-282019-06-292015-12-262015-09-262015-06-272014-12-272014-09-272014-06-28
Value035000.00-341000.0-222000.0-3959000.0-4942000.0-2598000.02024000.0
Percentage of DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax0.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax

us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax


None
Period End2020-06-272020-03-282019-06-292019-03-30
Value046000.038000.0189000.0
Percentage of DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax0.0100.0100.0100.0

us-gaap:DiscontinuedOperationTaxEffectOfDiscontinuedOperation

us-gaap:DiscontinuedOperationTaxEffectOfDiscontinuedOperation


None
Period End2020-06-272020-03-282019-06-292019-03-302015-12-262015-09-262014-09-272014-06-28
Value04000.014000.025000.000-105000.061000.0
Percentage of DiscontinuedOperationTaxEffectOfDiscontinuedOperation0.0100.0100.0100.00.00.0100.0100.0

us-gaap:DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss

us-gaap:DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss


None
Period End2020-06-272020-03-282019-06-292019-03-302015-12-262015-09-262015-06-272014-12-272014-09-272014-06-28
Value011000.038000.0189000.000-1049000.0-5243000.0-2598000.0-2224000.0
Percentage of DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss0.0100.0100.0100.00.00.0100.0100.0100.0100.0

us-gaap:DisposalGroupIncludingDiscontinuedOperationRevenue

us-gaap:DisposalGroupIncludingDiscontinuedOperationRevenue


None
Period End2020-06-272020-03-282019-06-292019-03-302015-09-262015-06-272014-12-272014-09-272014-06-282013-12-282013-09-282013-06-29
Value0.00.4321.7081.5920.02.3440.02.8681.9073.5353.9854.418
Percentage of DisposalGroupIncludingDiscontinuedOperationRevenue0.0100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash

us-gaap:DividendsCommonStockCash


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value02486000.02483000.02469000.02464000.02450000.02443000.01733000.01732000.01781000.0
Percentage of DividendsCommonStockCash0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value02486000.02483000.02469000.02464000.02450000.02443000.01733000.01732000.01781000.0
Percentage of DividendsCommonStockCash0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents

us-gaap:EffectOfExchangeRateOnCashAndCashEquivalents


None
Period End2020-03-282019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value-1488000.0-488000.0-2036000.0-393000.0-2143000.0973000.01339000.0-651000.01151000.01551000.0-5367000.0511000.0-402000.01008000.0-29000.0-1181000.0859000.0-2696000.0-3504000.0-1943000.0445000.080000.0972000.0708000.0-814000.0-945000.01032000.0794000.0-1639000.0787000.0-1283000.0-1408000.0195000.02269000.0173000.0885000.0
Percentage of EffectOfExchangeRateOnCashAndCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-29
Value223000.0172000.0161000.067000.079000.0280000.0438000.0115000.0126000.0314000.0101000.0107000.0249000.075000.080000.076000.073000.040000.068000.070000.067000.044000.047000.060000.056000.041000.0
Percentage of EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseInterestExpense

us-gaap:FinanceLeaseInterestExpense


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-30
Value29000.028000.029000.029000.059000.0
Percentage of FinanceLeaseInterestExpense100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseInterestPaymentOnLiability

us-gaap:FinanceLeaseInterestPaymentOnLiability


None
Period End2020-06-272020-03-282019-06-292019-03-30
Value29000.028000.036000.037000.0
Percentage of FinanceLeaseInterestPaymentOnLiability100.0100.0100.0100.0

us-gaap:FinanceLeasePrincipalPayments

us-gaap:FinanceLeasePrincipalPayments


None
Period End2020-06-272020-03-282019-06-292019-03-30
Value59000.09000.08000.09000.0
Percentage of FinanceLeasePrincipalPayments100.0100.0100.0100.0

us-gaap:FinanceLeaseRightOfUseAssetAmortization

us-gaap:FinanceLeaseRightOfUseAssetAmortization


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-30
Value28000.020000.020000.021000.041000.0
Percentage of FinanceLeaseRightOfUseAssetAmortization100.0100.0100.0100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value-640000.0-404000.0-1259000.01630000.0-546000.0218000.0439000.0-232000.03031000.0-1579000.0
Percentage of ForeignCurrencyTransactionGainLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossRealized

us-gaap:ForeignCurrencyTransactionGainLossRealized


None
Period End2020-06-272020-03-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-27
Value-600000.0-400000.0-500000.0200000.0500000.0-200000.03000000.0-1600000.05700000.0-200000.0-1200000.0-1300000.03600000.0-300000.0300000.0-500000.0300000.01500000.0-600000.0200000.01100000.01000000.0
Percentage of ForeignCurrencyTransactionGainLossRealized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnDispositionOfAssets1

us-gaap:GainLossOnDispositionOfAssets1


None
Period End2020-06-272020-03-282019-06-292019-03-30
Value-24000.0-88000.0141000.0-378000.0
Percentage of GainLossOnDispositionOfAssets1100.0100.0100.0100.0

us-gaap:GoodwillForeignCurrencyTranslationGainLoss

us-gaap:GoodwillForeignCurrencyTranslationGainLoss


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-26
Value953000.0-672000.03481000.0-5999000.01498000.0-2857000.0-1715000.0-186000.0-2019000.01171000.0618000.01124000.01252000.01116000.0-2179000.0275000.0-61000.0550000.0
Percentage of GoodwillForeignCurrencyTranslationGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillForeignCurrencyTranslationGainLoss us-gaap:ReportingUnit

cohu:PCBTest


None
Period End2020-06-272020-03-28
Value80000.0-97000.0
Percentage of GoodwillForeignCurrencyTranslationGainLoss8.414.4

cohu:SemiconductorTestAndInspection


None
Period End2020-06-272020-03-28
Value873000.0-575000.0
Percentage of GoodwillForeignCurrencyTranslationGainLoss91.685.6

us-gaap:ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill

us-gaap:ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill


None
Period End2020-06-272020-03-282019-06-29
Value03949000.00
Percentage of ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill0.0100.00.0

us-gaap:ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

cohu:IndefiniteLivedInProcessResearchAndDevelopment


None
Period End2020-03-28
Value3900000.0
Percentage of ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill98.8

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302017-12-302017-09-302017-06-242016-12-312016-09-24
Value042000.0-1039000.0154000.024000.0164000.000-278000.0-217000.051000.0
Percentage of IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity0.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302017-12-302017-09-302017-06-242016-12-312016-09-242016-06-252015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282013-12-282013-09-282013-06-29
Value00-0.01000.0100-0.01-0.0100-0.01-0.01-0.15-0.04-0.040.020.1200.010.01
Percentage of IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare0.00.0100.00.00.0100.00.00.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302017-12-302017-09-302017-06-242016-12-312016-09-242016-06-252015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282013-12-282013-09-282013-06-29
Value00-0.01000.0100-0.01-0.0100-0.02-0.01-0.15-0.04-0.040.020.1200.010.01
Percentage of IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare0.00.0100.00.00.0100.00.00.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsPayable


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value6.7330.055-0.318-6.8237.499-3.48-8.14-2.8160.9332.927.777-10.6541.5895.4457.787-2.623-4.5395.0531.157-1.346-1.715.275-8.4622.275.5870.9257.263-2.8343.211-0.982-5.2133.195-1.236-2.204-3.843.1250.6370.505-9.6361.514
Percentage of IncreaseDecreaseInAccountsPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedIncomeTaxesPayable

us-gaap:IncreaseDecreaseInAccruedIncomeTaxesPayable


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value-7635000.07454000.0-6972000.0350000.0-1883000.0-2214000.0143000.02170000.02589000.0-861000.0-2790000.0450000.0132000.0690000.0494000.0196000.0-3134000.0487000.0-2632000.0711000.0588000.0505000.058000.01028000.0252000.072000.0-250000.0-455000.0-41000.0902000.0-1634000.0-780000.0326000.0421000.0-187000.0-1391000.0-6616000.01732000.0172000.0542000.0
Percentage of IncreaseDecreaseInAccruedIncomeTaxesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInContractWithCustomerLiability

us-gaap:IncreaseDecreaseInContractWithCustomerLiability


None
Period End2020-06-272020-03-282019-06-292019-03-30
Value-8.846140.056-0.6
Percentage of IncreaseDecreaseInContractWithCustomerLiability100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherAccruedLiabilities

us-gaap:IncreaseDecreaseInOtherAccruedLiabilities


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-09-272014-06-282014-03-292013-09-282013-06-292013-03-302012-09-292012-06-302012-03-312011-09-242011-06-252011-03-26
Value-185000.0-106000.01349000.01306000.01104000.01589000.0607000.0-115000.0468000.0-762000.0552000.0119000.0173000.0135000.0-554000.0445000.0243000.028000.0-1497000.0556000.0851000.0217000.0-401000.0-88000.0133000.037000.0137000.0257000.059000.066000.033000.0127000.078000.02000.0
Percentage of IncreaseDecreaseInOtherAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherCurrentAssets

us-gaap:IncreaseDecreaseInOtherCurrentAssets


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292015-09-262015-06-272015-03-282014-09-272014-06-282014-03-29
Value-5529000.05888000.0-1308000.0-1305000.04587000.04022000.0180000.0-2760000.0-1983000.0-230000.0-678000.0-913000.0-574000.01147000.0
Percentage of IncreaseDecreaseInOtherCurrentAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherNoncurrentAssets

us-gaap:IncreaseDecreaseInOtherNoncurrentAssets


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-28
Value-436000.0-810000.0191000.01882000.01284000.0-313000.02294000.0345000.0587000.0-265000.0-929000.0-482000.0-523000.0433000.0-447000.02000.04000.026000.0-196000.0364000.080000.078000.0
Percentage of IncreaseDecreaseInOtherNoncurrentAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInterestAndDividend

us-gaap:InvestmentIncomeInterestAndDividend


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value21000.0147000.0161000.0190000.0191000.0222000.0274000.0337000.0329000.0247000.0
Percentage of InvestmentIncomeInterestAndDividend100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LeaseCost

us-gaap:LeaseCost


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-30
Value2704000.02718000.02810000.02856000.02830000.0
Percentage of LeaseCost100.0100.0100.0100.0100.0

us-gaap:NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest

us-gaap:NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value-4.74-17.276-17.32-10.326-19.359-22.687-56.9974.803118.122
Percentage of NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value-4.74-17.276-17.32-10.326-19.359-22.687-56.9974.803118.122
Percentage of NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseCost


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-30
Value2112000.02151000.02142000.02139000.02122000.0
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


None
Period End2020-06-272020-03-282019-06-292019-03-30
Value1990000.02133000.01747000.01881000.0
Percentage of OperatingLeasePayments100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent


None
Period End2020-06-272020-03-282019-06-292019-03-30
Value1.897-0.9293.684-5.262
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


None
Period End2020-06-272019-06-292019-03-30
Value1.8973.684-5.258
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent100.0100.099.9

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest


None
Period End2020-06-272019-12-282019-09-282019-06-292019-03-30
Value0000-4000.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest0.00.00.00.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-26
Value1.897-0.9296.234-13.2413.645-4.784-4.682-0.49-6.6923.7710.2292.5883.33.978-8.7980.556-0.3562.488-1.271-4.1222.733-8.398-8.561-8.629-0.5040.3293.0074.651.157-3.9461.9542.178-4.9642.627-2.544-4.8210.6626.888
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax


None
Period End2020-06-272019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-24
Value01098000.0-35000.039000.0-474000.0-788000.024000.0-114000.073000.01132000.0-12000.059000.069000.0281000.02000.015000.018000.025000.0-99000.077000.055000.03086000.092000.0124000.0-44000.0-1496000.0-18000.0-31000.0-59000.0-13000.0-33000.0-44000.0-32000.0-1202000.0-47000.0
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForRestructuring us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan

us-gaap:PaymentsForRestructuring

cohu:EmployeeSeveranceAndOtherExitCosts, cohu:IntegrationProgram


None
Period End2020-06-272020-03-282019-06-292019-03-30
Value0.4441.3874.1471.637
Percentage of PaymentsForRestructuring100.0100.0100.0100.0

us-gaap:EmployeeSeverance, cohu:IntegrationProgram


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-30
Value0.2281.2185.6583.9614.2611.029
Percentage of PaymentsForRestructuring51.487.80.00.0102.762.9

us-gaap:OtherRestructuring, cohu:IntegrationProgram


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-30
Value0.2160.1690.7610.059-0.1140.608
Percentage of PaymentsForRestructuring48.612.20.00.0-2.737.1

us-gaap:PensionAndOtherPostretirementBenefitExpense

us-gaap:PensionAndOtherPostretirementBenefitExpense


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-30
Value198000.0254000.0736000.0-162000.0251000.0192000.0
Percentage of PensionAndOtherPostretirementBenefitExpense100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromConstructionLoansPayable

us-gaap:ProceedsFromConstructionLoansPayable


None
Period End2020-03-28
Value1117000.0
Percentage of ProceedsFromConstructionLoansPayable100.0

us-gaap:ProceedsFromDivestitureOfBusinessesNetOfCashDivested

us-gaap:ProceedsFromDivestitureOfBusinessesNetOfCashDivested


None
Period End2020-06-272020-03-28
Value02975000.0
Percentage of ProceedsFromDivestitureOfBusinessesNetOfCashDivested0.0100.0

us-gaap:ProceedsFromRepurchaseOfEquity

us-gaap:ProceedsFromRepurchaseOfEquity


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262014-12-272014-09-272013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252011-03-262010-12-252010-09-25
Value-0.0470.2531.196-0.1130.651-1.75-6.4250.0850.939-3.5773.2042.7295.377-0.9570.9690.235-1.165-0.3951.0320.0970.6691.0830.4160.2091.11-0.4190.5220.1140.7030.2310.3770.1260.8460.5620.7211.53
Percentage of ProceedsFromRepurchaseOfEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSalesOfAssetsInvestingActivities

us-gaap:ProceedsFromSalesOfAssetsInvestingActivities


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-302018-09-292018-06-302018-03-312017-09-302016-09-242016-06-252016-03-26
Value2451000.074000.0708000.0806000.05000.021000.0-16000.020000.0039000.00813000.0
Percentage of ProceedsFromSalesOfAssetsInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0

us-gaap:ProductWarrantyAccrualPayments

us-gaap:ProductWarrantyAccrualPayments


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-312017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-25
Value1316000.01778000.01782000.02071000.02066000.02654000.03124000.01946000.01774000.01515000.01487000.01773000.01865000.01191000.01191000.02189000.01401000.01546000.01488000.01973000.01905000.02067000.01891000.01332000.01252000.01371000.01549000.02399000.01402000.01457000.01409000.01303000.01540000.01741000.01739000.02434000.02383000.02401000.0
Percentage of ProductWarrantyAccrualPayments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductWarrantyAccrualWarrantiesIssued

us-gaap:ProductWarrantyAccrualWarrantiesIssued


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-312017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-25
Value1.0441.8912.0191.1371.831.7282.1661.61.8061.5821.3191.721.991.7361.7361.5021.321.4461.821.6851.8671.9281.4392.5531.6331.1371.2112.5450.6971.9210.240.3951.0061.1481.6652.9512.5872.178
Percentage of ProductWarrantyAccrualWarrantiesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestructuringCharges

us-gaap:RestructuringCharges


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292014-06-28
Value0.5850.4032.7640.8148.5451.361180.427
Percentage of RestructuringCharges100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestructuringCharges us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan

cohu:EmployeeSeveranceAndOtherExitCosts, cohu:IntegrationProgram


None
Period End2020-06-272020-03-282019-06-292019-03-30
Value0.5850.4038.5451.361
Percentage of RestructuringCharges100.0100.0100.0100.0

us-gaap:EmployeeSeverance, cohu:IntegrationProgram


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-30
Value0.00.2342.0030.7558.6590.753
Percentage of RestructuringCharges0.058.172.592.8101.355.3

us-gaap:OtherRestructuring, cohu:IntegrationProgram


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-30
Value0.5850.1690.7610.059-0.1140.608
Percentage of RestructuringCharges100.041.927.57.2-1.344.7

us-gaap:RestructuringCharges us-gaap:RestructuringPlan

cohu:IntegrationProgram


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-30
Value0.72.05.4930.8148.5451.361
Percentage of RestructuringCharges119.7496.3198.7100.0100.0100.0

us-gaap:RestructuringReserveTranslationAndOtherAdjustment us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan

us-gaap:RestructuringReserveTranslationAndOtherAdjustment

cohu:EmployeeSeveranceAndOtherExitCosts, cohu:IntegrationProgram


None
Period End2020-06-272020-03-282019-06-292019-03-30
Value16000.0-33000.022000.04000.0
Percentage of RestructuringReserveTranslationAndOtherAdjustment100.0100.0100.0100.0

us-gaap:EmployeeSeverance, cohu:IntegrationProgram


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-30
Value16000.0-33000.086000.0-163000.022000.04000.0
Percentage of RestructuringReserveTranslationAndOtherAdjustment100.0100.00.00.0100.0100.0

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability


None
Period End2020-06-272020-03-28
Value-13000.0373000.0
Percentage of RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability100.0100.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


None
Period End2020-06-272020-03-282019-06-292019-03-30
Value0.5141.0626.97931
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod

us-gaap:PerformanceShares


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-302018-09-292018-06-302018-03-31
Value4995.034080.01404.04689.029603.001466.039174.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-24
Value79484.0369130.02205.0201430.024326.0335040.067969.04804.018012.0409220.010471.05905.0118060.0274560.012775.06250.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod1591.31083.10.014346.7518.81131.80.00.01228.61044.60.00.00.00.00.00.0

us-gaap:ShortTermLeaseCost

us-gaap:ShortTermLeaseCost


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-30
Value19000.019000.080000.066000.078000.0
Percentage of ShortTermLeaseCost100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan


None
Period End2020-06-272019-12-282019-09-282019-06-292018-12-292018-09-292018-06-30
Value1602000.01539000.00807000.0761000.00762000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.0100.00.0100.0100.00.0100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


None
Period End2020-06-272019-12-282019-09-282019-06-292018-12-292018-09-292018-06-30
Value1488000.01416000.00743000.0717000.00721000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan92.992.00.092.194.20.094.6

us-gaap:CommonStock


None
Period End2020-06-272019-12-282019-09-282019-06-292018-12-292018-09-292018-06-30
Value114000.0123000.0064000.044000.0041000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan7.18.00.07.95.80.05.4

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardGross us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardGross

us-gaap:AdditionalPaidInCapital


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value-84000.0-403000.0-2000.0-203000.0-29000.0-365000.0-68000.0-5000.0-20000.0-448000.0
Percentage of StockIssuedDuringPeriodValueRestrictedStockAwardGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStock


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value84000.0403000.02000.0203000.029000.0365000.068000.05000.020000.0448000.0
Percentage of StockIssuedDuringPeriodValueRestrictedStockAwardGross-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value0.00.2890.0790.2080.0440.0780.040.1260.3110.203
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value0.00.2670.0740.1860.0390.0680.0380.1110.280.184
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised0.092.493.789.488.687.295.088.190.090.6

us-gaap:CommonStock


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value0.00.0220.0050.0220.0050.010.0020.0150.0310.019
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised0.07.66.310.611.412.85.011.910.09.4

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value288000.01397000.013000.0730000.0200000.0-1828000.0-15555000.041000.0134000.0-3780000.0
Percentage of StockRepurchasedAndRetiredDuringPeriodValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value266000.01263000.013000.0670000.0187000.0-1705000.0-15193000.039000.0129000.0-3620000.0
Percentage of StockRepurchasedAndRetiredDuringPeriodValue92.490.4100.091.893.593.397.795.196.395.8

us-gaap:CommonStock


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-31
Value22000.0134000.0060000.013000.0-123000.0-362000.02000.05000.0-160000.0
Percentage of StockRepurchasedAndRetiredDuringPeriodValue7.69.60.08.26.56.72.34.93.74.2

us-gaap:SubleaseIncome

us-gaap:SubleaseIncome


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-30
Value31000.032000.031000.034000.036000.0
Percentage of SubleaseIncome100.0100.0100.0100.0100.0

us-gaap:UnrecognizedTaxBenefitsPeriodIncreaseDecrease

us-gaap:UnrecognizedTaxBenefitsPeriodIncreaseDecrease


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-302018-09-292018-06-302018-03-312017-09-302017-06-242017-03-252014-09-272014-06-28
Value-200000.0-200000.000000000000
Percentage of UnrecognizedTaxBenefitsPeriodIncreaseDecrease100.0100.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:VariableLeaseCost

us-gaap:VariableLeaseCost


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-30
Value547000.0532000.0570000.0635000.0566000.0
Percentage of VariableLeaseCost100.0100.0100.0100.0100.0

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment

us-gaap:WeightedAverageNumberDilutedSharesOutstandingAdjustment


None
Period End2020-06-272019-06-292018-09-292018-06-302018-03-312017-09-302017-06-242017-03-252016-09-242016-06-252015-09-262015-06-272015-03-282014-09-272014-06-282014-03-292011-09-242011-06-25
Value00822000.0758000.0929000.0950000.01017000.01274000.0606000.0647000.0621000.0663000.00693000.0473000.00320000.0381000.0
Percentage of WeightedAverageNumberDilutedSharesOutstandingAdjustment0.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0

cohu:AvailableForSaleSecuritiesDebtMaturitiesDueAfterOneYearThroughThreeYearsEstimatedFairValue

cohu:AvailableForSaleSecuritiesDebtMaturitiesDueAfterOneYearThroughThreeYearsEstimatedFairValue


None
Period End2020-06-272019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-30
Value0904000.0573000.0581000.0565000.0560000.0549000.0556000.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesDueAfterOneYearThroughThreeYearsEstimatedFairValue0.0100.0100.0100.0100.0100.0100.0100.0

cohu:AvailableforsaleSecuritiesDebtMaturitiesYearTwoThroughThreeAmortizedCostBasis

cohu:AvailableforsaleSecuritiesDebtMaturitiesYearTwoThroughThreeAmortizedCostBasis


None
Period End2020-06-272019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302017-06-242017-03-252016-12-312015-12-26
Value0904000.0573000.0581000.0565000.0560000.0549000.0556000.0616000.0615000.0623000.0202000.0
Percentage of AvailableforsaleSecuritiesDebtMaturitiesYearTwoThroughThreeAmortizedCostBasis0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cohu:DebtLongtermAndShorttermCombinedAmountGross

cohu:DebtLongtermAndShorttermCombinedAmountGross


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-30
Value3623603603593563573588.963
Percentage of DebtLongtermAndShorttermCombinedAmountGross100.0100.0100.0100.0100.0100.0100.0100.0

cohu:DeferredProfit

cohu:DeferredProfit


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302011-12-31
Value9.6149.3137.6457.9528.1638.2686.8961.8941.7092.9146.6086.7216.3474.7956.8865.7266.8765.5643.735.7327.6487.7237.445118.8586.3316.0665.4826.9495.5612.1391.8024.1592.821
Percentage of DeferredProfit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cohu:DeferredProfitLongterm

cohu:DeferredProfitLongterm


None
Period End2020-06-272020-03-282019-12-28
Value6900000.07100000.07200000.0
Percentage of DeferredProfitLongterm100.0100.0100.0

cohu:LeaseLiability

cohu:LeaseLiability


None
Period End2020-06-272020-03-282019-12-28
Value353636
Percentage of LeaseLiability100.0100.0100.0

cohu:LeaseLiabilityNoncurrent

cohu:LeaseLiabilityNoncurrent


None
Period End2020-06-272020-03-282019-12-28
Value272828
Percentage of LeaseLiabilityNoncurrent100.0100.0100.0

cohu:LeaseRightofuseAsset

cohu:LeaseRightofuseAsset


None
Period End2020-06-272020-03-282019-12-28
Value343535
Percentage of LeaseRightofuseAsset100.0100.0100.0

cohu:ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfSharesAvailableForIssue us-gaap:Range, us-gaap:AwardType

cohu:ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfSharesAvailableForIssue

srt:Maximum, us-gaap:PerformanceShares


None
Period End2020-06-27
Value2.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfSharesAvailableForIssue100.0

srt:Minimum, us-gaap:PerformanceShares


None
Period End2020-06-27
Value0.25
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfSharesAvailableForIssue12.5

us-gaap:AccountsAndOtherReceivablesNetCurrent

us-gaap:AccountsAndOtherReceivablesNetCurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value12211112712613413114978918571769082635662655956696773866966605860563643423641505366
Percentage of AccountsAndOtherReceivablesNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccruedIncomeTaxesNoncurrent

us-gaap:AccruedIncomeTaxesNoncurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282012-12-29
Value6814000.08203000.08438000.09459000.09591000.09847000.09711000.06293000.06297000.06435000.06270000.06600000.07280000.07149000.06375000.06807000.06832000.07193000.06761000.06542000.07046000.07125000.07321000.07289000.07567000.07488000.07463000.02118000.0
Percentage of AccruedIncomeTaxesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetsFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312015-12-26
Value11216314713213013914414199841009873577073
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312015-12-26
Value518.5958.57513132020305154543940485743
Percentage of AssetsFairValueDisclosure45.45.25.810.310.414.614.021.451.864.854.340.255.083.882.258.7

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312015-12-26
Value163172156145143160165171150139155138114106128117
Percentage of AssetsFairValueDisclosure145.4105.2105.8110.3110.4114.6114.0121.4151.8164.8154.3140.2155.0183.8182.2158.7

us-gaap:AssetsHeldForSaleNotPartOfDisposalGroupCurrent

us-gaap:AssetsHeldForSaleNotPartOfDisposalGroupCurrent


None
Period End2020-06-272020-03-282019-12-28
Value6905000.08346000.0827000.0
Percentage of AssetsHeldForSaleNotPartOfDisposalGroupCurrent100.0100.0100.0

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperation

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperation


None
Period End2020-06-272019-12-282019-09-282019-06-292019-03-302018-12-292013-12-282012-12-29
Value0.03.6183.8634.1654.2163.826.7037.862
Percentage of AssetsOfDisposalGroupIncludingDiscontinuedOperation0.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent


None
Period End2020-06-272019-12-282019-09-282019-06-292019-03-302018-12-292014-12-272013-12-28
Value0.03.5033.7334.14.1223.741106.272
Percentage of AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent0.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecurities us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:AvailableForSaleSecurities

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:ForeignGovernmentDebtSecurities


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312015-12-26
Value0.920.9010.9040.5730.5810.5650.560.5490.5560.5950.6190.6030.6160.6150.6230.65
Percentage of AvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecurities us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:FairValueMeasurementsRecurring, us-gaap:ForeignGovernmentDebtSecurities


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312015-12-26
Value0.920.9010.9040.5730.5810.5650.560.5490.5560.5950.6190.6030.6160.6150.6230.65
Percentage of AvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesAmortizedCost us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesAmortizedCost

us-gaap:ForeignGovernmentDebtSecurities


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-27
Value0.920.9010.9040.5730.5810.5650.560.5490.5560.5940.6190.6030.6160.6150.6230.6390.6550.6610.650.4650.453
Percentage of AvailableForSaleSecuritiesAmortizedCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue

us-gaap:AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242015-12-262012-09-292012-06-302011-12-31
Value0.00.00.00.00.00.00.00.01423137.5161826100.00.05.912
Percentage of AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue0.00.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0

us-gaap:AvailableForSaleSecuritiesCurrent

us-gaap:AvailableForSaleSecuritiesCurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value0.920.9010.9040.5730.5810.5650.560.54923242116212231199.2159.5761.6521.4671.4531.111.1551.1550.21.0751.26.6096.7897.3087.42134475351505252
Percentage of AvailableForSaleSecuritiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesCurrent us-gaap:InvestmentType

us-gaap:ForeignGovernmentDebtSecurities


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-27
Value0.920.9010.9040.5730.5810.5650.560.5490.5560.5940.6190.6030.6160.6150.6230.6390.6550.6610.650.4650.453
Percentage of AvailableForSaleSecuritiesCurrent100.0100.0100.0100.0100.0100.0100.0100.02.32.42.93.72.82.71.93.37.16.939.331.731.2

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate


None
Period End2020-06-272020-03-282019-12-28
Value920000.0901000.0904000.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis


None
Period End2020-06-272020-03-282019-12-28
Value920000.0901000.0904000.0
Percentage of AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost


None
Period End2020-06-272020-03-282019-12-282018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-28
Value0.920.9010.023242116212131199.2159.5751.451.4671.4531.111.1551.1550.21.0751.2
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue


None
Period End2020-06-272020-03-282019-12-282018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-28
Value0.920.9010.023242116212131199.2159.5761.451.4671.4531.111.1551.1550.21.0751.2
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:CashAndCashEquivalents, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:CashAndCashEquivalentsFairValueDisclosure

us-gaap:Cash, us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312015-12-26
Value11216314713213013914414199841009873577073
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MoneyMarketFunds, us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312015-12-26
Value507.6947.67113121919291915221314172441
Percentage of CashAndCashEquivalentsFairValueDisclosure44.64.75.29.910.014.213.721.019.418.122.014.019.330.934.456.4

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:CashAndCashEquivalents, us-gaap:FairValueByMeasurementFrequency

us-gaap:Cash, us-gaap:FairValueMeasurementsRecurring


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312015-12-26
Value11216314713213013914414199841009873577073
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MoneyMarketFunds, us-gaap:FairValueMeasurementsRecurring


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312015-12-26
Value507.6947.67113121919291915221314172441
Percentage of CashAndCashEquivalentsFairValueDisclosure44.64.75.29.910.014.213.721.019.418.122.014.019.330.934.456.4

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302016-12-31
Value16217115514614316016417012711513496
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:DebtInstrument

us-gaap:DebtInstrumentCarryingAmount

cohu:ConstructionLoan


None
Period End2020-06-272019-12-28
Value8.4085.476
Percentage of DebtInstrumentCarryingAmount100.0100.0

cohu:KitaTermLoans


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-30
Value3.6673.7453.834.0424.184.3544.5765.855
Percentage of DebtInstrumentCarryingAmount43.60.069.90.00.00.00.00.0

cohu:RascoConstructionLoan


None
Period End2020-03-282019-12-28
Value6.5885.476
Percentage of DebtInstrumentCarryingAmount0.0100.0

cohu:SecuredTermLoanFacility


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-29
Value344345346346347348349
Percentage of DebtInstrumentCarryingAmount4100.30.06327.60.00.00.00.0

cohu:Xcerra


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-29
Value1.3161.3921.4751.5241.671.7291.839
Percentage of DebtInstrumentCarryingAmount15.70.026.90.00.00.00.0

us-gaap:DebtInstrumentFaceAmount us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentFaceAmount

cohu:ThirdFacility, us-gaap:ConstructionLoans


None
Period End2020-06-16
Value1.5
Percentage of DebtInstrumentFaceAmount100.0

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-29
Value6851000.07151000.07441000.07725000.08004000.08280000.08551000.0
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncome

us-gaap:DeferredIncome


None
Period End2020-06-272020-03-282019-12-28
Value181816
Percentage of DeferredIncome100.0100.0100.0

us-gaap:DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent

us-gaap:DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent


None
Period End2020-06-272019-12-282019-09-282019-06-292019-03-302018-12-29
Value0115000.0130000.065000.094000.079000.0
Percentage of DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent0.0100.0100.0100.0100.0100.0

us-gaap:DisposalGroupIncludingDiscontinuedOperationCash

us-gaap:DisposalGroupIncludingDiscontinuedOperationCash


None
Period End2020-06-272019-12-282019-09-282019-06-292019-03-302018-12-29
Value0736000.01176000.0750000.0820000.0461000.0
Percentage of DisposalGroupIncludingDiscontinuedOperationCash0.0100.0100.0100.0100.0100.0

us-gaap:DividendsPayableCurrentAndNoncurrent

us-gaap:DividendsPayableCurrentAndNoncurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-09-292012-06-302012-03-312011-12-312011-09-242010-12-25
Value02488000.02484000.02468000.02466000.02449000.02445000.01734000.01733000.01713000.01705000.01683000.01673000.01614000.01606000.01603000.01601000.01575000.01573000.01567000.01566000.01543000.01539000.01532000.01524000.01507000.01504000.01496000.01494000.01478000.01468000.01468000.01462000.01455000.01450000.01434000.0
Percentage of DividendsPayableCurrentAndNoncurrent0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value2520232524212917161320181615141714141516131319201614151513141011101012141416
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityCurrent


None
Period End2020-06-272019-12-28
Value2691000.02574000.0
Percentage of FinanceLeaseLiabilityCurrent100.0100.0

us-gaap:FinanceLeaseLiabilityCurrent us-gaap:BalanceSheetLocation

cohu:OtherAccruedLiabilities


None
Period End2020-03-282019-12-28
Value2688000.02574000.0
Percentage of FinanceLeaseLiabilityCurrent0.0100.0

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:FinanceLeaseLiabilityNoncurrent


None
Period End2020-06-272020-03-282019-12-28
Value198000.0249000.00
Percentage of FinanceLeaseLiabilityNoncurrent100.0100.00.0

us-gaap:FinanceLeaseRightOfUseAsset

us-gaap:FinanceLeaseRightOfUseAsset


None
Period End2020-06-272020-03-282019-12-28
Value2841000.02865000.02515000.0
Percentage of FinanceLeaseRightOfUseAsset100.0100.0100.0

us-gaap:FinanceLeaseRightOfUseAssetAccumulatedAmortization

us-gaap:FinanceLeaseRightOfUseAssetAccumulatedAmortization


None
Period End2020-06-272020-03-282019-12-28
Value200000.0100000.0100000.0
Percentage of FinanceLeaseRightOfUseAssetAccumulatedAmortization100.0100.0100.0

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent


None
Period End2020-06-272020-03-282019-12-28
Value0.040.0390.045
Percentage of FinanceLeaseWeightedAverageDiscountRatePercent100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-312013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292011-12-31
Value88787464554435181716153940383634323129302929272525231917161512
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerRelationships


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-302017-09-302017-06-242016-12-31
Value18161412119.1987.3784.8384.5824.3483.644
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization20.620.819.819.920.120.421.026.226.226.39.2

us-gaap:DevelopedTechnologyRights


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-302017-09-302017-06-242016-12-31
Value655749423527211211119.597
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization73.773.466.565.163.562.260.268.468.468.924.3

us-gaap:NoncompeteAgreements


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-302017-09-30
Value0.1150.1060.0960.090.0820.0720.0630.0310.023
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization0.10.10.10.10.10.20.20.20.1

us-gaap:TradeNames


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-26
Value4.9784.4433.8923.3392.8722.3171.8070.9720.8490.7340.5730.4680.4010.3050.2120.092
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization5.65.75.25.25.25.15.15.34.84.43.81.21.00.80.60.3

us-gaap:FiniteLivedIntangibleAssetsGross

us-gaap:FiniteLivedIntangibleAssetsGross


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-312013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292011-12-31
Value323322322324319314317353535325760606059545554575964646464635251333231
Percentage of FiniteLivedIntangibleAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsGross us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerRelationships


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-302017-09-302017-06-242016-12-31
Value717172717372737.9347.9357.9836.996
Percentage of FiniteLivedIntangibleAssetsGross22.222.222.422.122.923.123.022.522.522.612.2

us-gaap:DevelopedTechnologyRights


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-302017-09-302017-06-242016-12-31
Value22822822722321621221420202119
Percentage of FiniteLivedIntangibleAssetsGross70.670.670.568.967.867.667.459.058.959.633.5

us-gaap:NoncompeteAgreements


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-302017-09-30
Value0.3290.3270.3220.3260.3270.3180.3140.3130.312
Percentage of FiniteLivedIntangibleAssetsGross0.10.10.10.10.10.10.10.90.9

us-gaap:TradeNames


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262014-12-27
Value222222222222226.1856.1396.1765.4985.3535.6515.6285.6145.5475.723
Percentage of FiniteLivedIntangibleAssetsGross7.07.07.06.97.17.27.117.617.417.517.09.39.39.39.39.39.9

us-gaap:InventoryFinishedGoodsNetOfReserves

us-gaap:InventoryFinishedGoodsNetOfReserves


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292011-12-31
Value171714181615218.84410109.0377.236.5865.7264.8665.2565.2484.6136.8017.36.6676.5957.0738.6547.8621211118.55210101219
Percentage of InventoryFinishedGoodsNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryRawMaterialsAndSuppliesNetOfReserves

us-gaap:InventoryRawMaterialsAndSuppliesNetOfReserves


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-30
Value7873697068636030282727
Percentage of InventoryRawMaterialsAndSuppliesNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryWorkInProcessNetOfReserves

us-gaap:InventoryWorkInProcessNetOfReserves


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292011-12-31
Value454446445251572423252522252117182022201818222122232418171820141515
Percentage of InventoryWorkInProcessNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent

us-gaap:LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent


None
Period End2020-06-272019-12-282019-09-282019-06-292019-03-302018-12-292014-12-272013-12-28
Value0599000.0564000.0624000.0596000.0518000.02783000.01747000.0
Percentage of LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent0.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent

us-gaap:LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent


None
Period End2020-06-272019-12-282019-09-282014-12-27
Value024000.034000.0706000.0
Percentage of LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent0.0100.0100.0100.0

us-gaap:LineOfCredit

us-gaap:LineOfCredit


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262014-12-27
Value4665000.03244000.03195000.03241000.03244000.03161000.03115000.03108000.0000000000
Percentage of LineOfCredit100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.0

us-gaap:LineOfCredit us-gaap:CreditFacility

us-gaap:RevolvingCreditFacility


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-09-302017-06-242017-03-25
Value4700000.03200000.03200000.03300000.03200000.03200000.03100000.03100000.03200000.03200000.0
Percentage of LineOfCredit100.898.6100.2101.898.6101.299.50.00.00.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:CreditFacility

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

us-gaap:RevolvingCreditFacility


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-09-302017-06-242017-03-25
Value9000000.08900000.08800000.08900000.06500000.06300000.06200000.06200000.06300000.06300000.0
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LoansPayableToBankCurrent

us-gaap:LoansPayableToBankCurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-25
Value3254000.03322000.03322000.03141000.03243000.03422000.03672000.01021000.01185000.01291000.01280000.01300000.01409000.01190000.0
Percentage of LoansPayableToBankCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermLoansFromBank

us-gaap:LongTermLoansFromBank


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-25
Value3483463463443413423463.844.0944.5474.5754.8535.2655.894
Percentage of LongTermLoansFromBank100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherAccruedLiabilitiesNoncurrent

us-gaap:OtherAccruedLiabilitiesNoncurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-25
Value8.388.548.6567.2095.7954.6244.2592.8523.1462.5633.5562.293.4553.3351.7652.0891.81.7281.7641.8651.9041.1931.0751714135.8476.0375.9516.0035.9646.2656.0995.931
Percentage of OtherAccruedLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PostemploymentBenefitsLiabilityNoncurrent

us-gaap:PostemploymentBenefitsLiabilityNoncurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282012-12-29
Value2222212020191918181818171616151615151514151513101010103.729
Percentage of PostemploymentBenefitsLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PrepaidExpenseCurrent

us-gaap:PrepaidExpenseCurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292017-12-30
Value202017192218268.338
Percentage of PrepaidExpenseCurrent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductWarrantyAccrual

us-gaap:ProductWarrantyAccrual


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-312017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282012-12-292012-06-302012-03-312011-12-312011-06-252011-03-262010-12-25
Value5996000.06268000.06155000.05918000.06852000.07088000.08014000.04602000.04948000.04916000.04849000.05017000.05070000.04945000.04945000.04350000.05037000.05118000.05218000.04886000.05174000.05212000.05732000.06184000.04682000.04244000.04816000.05155000.04206000.06134000.06727000.06801000.06080000.06303000.05016000.0
Percentage of ProductWarrantyAccrual100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductWarrantyAccrualClassifiedCurrent

us-gaap:ProductWarrantyAccrualClassifiedCurrent


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282013-09-282013-06-292013-03-302012-12-292012-09-292012-06-302012-03-312011-12-312011-09-242011-06-252010-12-252009-12-26
Value5814000.06066000.05893000.05716000.06616000.06859000.07769000.04357000.04402000.04570000.04280000.04344000.04393000.04263000.03737000.03787000.04113000.04246000.03785000.03991000.03308000.04539000.06184000.04963000.04582000.04914000.05252000.05106000.05811000.05340000.04692000.05600000.06134000.06727000.06801000.06284000.06080000.05016000.03747000.0
Percentage of ProductWarrantyAccrualClassifiedCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductWarrantyAccrualNoncurrent us-gaap:BalanceSheetLocation

us-gaap:ProductWarrantyAccrualNoncurrent

cohu:NoncurrentOtherAccruedLiabilities


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272014-12-27
Value200000.0200000.0300000.0200000.0200000.0200000.0200000.0200000.0500000.0300000.0600000.0700000.0700000.0700000.0600000.01300000.01000000.01000000.01100000.01200000.01900000.01100000.0
Percentage of ProductWarrantyAccrualNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestructuringReserve us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan

us-gaap:RestructuringReserve

cohu:EmployeeSeveranceAndOtherExitCosts, cohu:IntegrationProgram


None
Period End2020-06-272020-03-282019-12-282019-06-292019-03-302018-12-29
Value376000.0219000.01236000.08174000.03754000.04026000.0
Percentage of RestructuringReserve100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeSeverance, cohu:IntegrationProgram


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-29
Value7000.0219000.01236000.04805000.08174000.03754000.04026000.0
Percentage of RestructuringReserve1.9100.0100.00.0100.0100.0100.0

us-gaap:OtherRestructuring, cohu:IntegrationProgram


None
Period End2020-06-272019-12-282019-06-292019-03-302018-12-29
Value369000.00000
Percentage of RestructuringReserve98.10.00.00.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

us-gaap:PerformanceShares


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-302018-09-292018-06-302018-03-312017-09-302014-12-272013-12-282012-12-29
Value443150.0465170.0364190.0369810.0388570.0339770.0339770.0343770.0357330.0334000.0238000.0122000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272015-03-282014-12-272014-09-272014-06-282014-03-292013-12-282012-12-292011-12-312010-12-25
Value1565900.01575000.01328000.01331400.01539100.01477100.01265000.0800860.0808090.0812640.0981000.01014100.01017900.01105100.01083000.01115400.01138300.01108700.01078000.01097400.01112500.01169700.01026000.01101200.01109300.01131900.0887000.0615000.0299000.0373000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber353.4338.60.0365.6416.2380.10.0235.7237.8236.40.0283.80.00.00.00.00.00.00.00.00.00.0307.20.00.00.0372.7504.10.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

cohu:EmployeeStockPurchasePlan


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-252016-12-312016-09-242016-06-252016-03-262015-12-262015-09-262015-06-272014-12-27
Value797730.0911340.0911340.01034600.01034600.0598610.0598610.0559650.0559650.0601340.0601340.0639170.0639170.0700480.0700480.0754780.0754780.0811060.0811060.0864320.0864320.0183590.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cohu:EquityIncentivePlan2005


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-03-252016-12-312016-09-242016-06-252016-03-262015-12-26
Value1704400.01761400.02503900.02507000.02500300.0575850.01198100.01204800.01203300.01215400.01503100.01421300.01853500.01815500.01612800.01698100.02255700.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant213.7193.3274.8242.3241.796.2200.1215.3215.0202.1250.0202.9264.6240.5213.7209.4278.1

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding us-gaap:AwardType

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding

us-gaap:PerformanceShares


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-302018-09-292018-06-302018-03-312017-09-30
Value7.16.14.95.76.68.58.37.86.2
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


None
Period End2020-06-272020-03-282019-09-282019-06-292019-03-302018-09-292018-06-302018-03-312017-09-302017-06-242017-03-252016-09-242016-06-252016-03-26
Value2520172325201918171719121212
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding353.5337.7363.3419.3381.8236.5238.6237.2285.50.00.00.00.00.0

us-gaap:ShortTermBankLoansAndNotesPayable

us-gaap:ShortTermBankLoansAndNotesPayable


None
Period End2020-06-272020-03-282019-12-282019-09-282019-06-292019-03-302018-12-292018-09-292018-06-302018-03-312017-12-302017-09-302017-06-242017-03-25
Value4665000.03244000.03195000.03241000.03244000.03160000.03115000.03080000.03160000.03293000.03108000.03130000.03172000.03178000.0
Percentage of ShortTermBankLoansAndNotesPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Line plots across dimensions of each concept


us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:StatementGeographical
(None,)
None
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:StatementBusinessSegments
(None,)
None
us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:IncomeStatementLocation
(None,)
None
us-gaap:Assets
us-gaap:StatementBusinessSegments
(None,)
None
us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
(None,)
None
us-gaap:Goodwill
us-gaap:ReportingUnit
(None,)
None
us-gaap:LongTermDebtCurrent
us-gaap:DebtInstrument
(None,)
None
us-gaap:LongTermDebt
us-gaap:DebtInstrument
(None,)
None
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents
(None,)
None