MSGE

Line plots across dimensions of each concept
Line plots across concepts
Tables

Plots across concepts

IncomeStatement

Expenses

Balance Sheet

Assets

Current Assets

NonCurrent Assets

PropertyPlantAndEquipmentNet

Liabilities

Current Liabilities

Noncurrent Liabilities

Stockholders Equity

CashFlow

NetCashProvidedByUsedInOperatingActivities

NetCashProvidedByUsedInInvestingActivities

NetCashProvidedByUsedInFinancingActivities

OperatingLeaseLiability

NonoperatingIncomeExpense

LesseeOperatingLeaseLiabilityPaymentsDue

FiniteLivedIntangibleAssets

Tables

		2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassA	██▁	0.196	0.196	0.195	NA	NA	NA	0.0	NA	NA	NA
us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassB	▄▄▄	0.045	0.045	0.045	NA	NA	NA	0.0	NA	NA	NA
us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock us-gaap:CommonClassA	██▁	19.613	19.613	19.493	NA	NA	NA	NA	NA	NA	NA
us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted	▁█	24.146	24.334	NA	NA	23.992	23.992	NA	NA	NA	NA
us-gaap:EarningsPerShareBasicAndDiluted	▁▂█▁▇▃▃▄▇▄	-5.17	-3.69	5.09	-5.36	3.39	-2.33	-2.47	-0.5	3.65	-1.31

		2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
SG&A Ratio us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,msge:MadisonSquareGardenEntertainment	█▁	12.669	7.555	NA	NA	325.37	119.652	NA	NA	NA	NA
SG&A Ratio us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,msge:TaoGroupHospitality	█▁	10.491	7.221	NA	NA	69.104	58.617	NA	NA	NA	NA

		2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30

		2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
us-gaap:AllocatedShareBasedCompensationExpense	█▃▃▂▂▂▁▂	23.562	11.529	12.896	8.836	10.373	10.085	7.472	8.726	NA	NA
us-gaap:ComprehensiveIncomeNetOfTax	▂▃█▁█▃▃▅	-112.686	-75.542	121.331	-148.123	104.838	-65.646	-70.608	-5.219	NA	NA
us-gaap:ComprehensiveIncomeNetOfTax us-gaap:StatementEquityComponents us-gaap:Parent	▁█	-112.686	-75.542	NA	-148.123	104.838	-65.646	NA	-5.219	NA	NA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	▂▃█▁█▄▃▅	-116.93	-80.061	113.223	-170.375	106.176	-66.242	-76.069	-5.906	NA	NA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	▂▃█▁▇▄▃▅	-128.78	-94.201	127.599	-160.964	83.899	-56.378	-67.143	-12.147	NA	NA
us-gaap:IncomeTaxExpenseBenefit	▄▄█▁▄▄▄▄	0.323	0.163	13.732	-10.126	1.255	0.185	-0.81	0.469	NA	NA
us-gaap:IncomeTaxesPaid	▁█	0.0	15.526	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:InterestExpense	█▁▁▁▁▂▆▄	7.675	0.409	0.446	0.605	0.144	1.105	5.186	3.247	NA	NA
us-gaap:NetIncomeLoss	▁▂█▁▇▃▃▄▇▄	-124.859	-89.845	126.626	-128.586	78.915	-55.967	-59.289	-11.929	87.609	-31.345
us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents msge:MSGSportsCorpInvestment	▁█	-124.859	-89.845	NA	-128.586	81.306	-55.967	NA	-11.929	NA	NA
us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:Parent	▁█	-124.859	-89.845	NA	-128.586	81.306	-55.967	NA	-11.929	NA	NA
us-gaap:NonoperatingIncomeExpense	▁▇█▁▅▄▂▄	-16.256	32.414	41.359	-15.423	14.309	11.768	-9.055	6.472	NA	NA
us-gaap:OperatingIncomeLoss	▂▂█▁▇▃▄▅█▄	-112.524	-126.615	94.366	-145.541	67.199	-68.146	-57.213	-18.619	84.506	-51.604
us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems us-gaap:IntersegmentElimination	▁█	-0.263	-0.262	NA	NA	-0.075	-0.075	NA	NA	NA	NA
us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems us-gaap:MaterialReconcilingItems	█▁	-3.99	-4.446	NA	NA	-4.963	-3.974	NA	NA	NA	NA
us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,msge:MadisonSquareGardenEntertainment	█▁	-97.088	-110.651	NA	NA	67.132	-67.444	NA	NA	NA	NA
us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,msge:TaoGroupHospitality	█▁	-11.183	-11.256	NA	NA	7.496	3.347	NA	NA	NA	NA
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	▁█	11.883	13.951	NA	-19.946	23.186	-10.018	NA	6.383	NA	NA
us-gaap:OtherComprehensiveIncomeLossNetOfTax	▆▇▄▁█▃▃▅	12.173	14.303	-0.644	-19.537	23.532	-9.679	-9.736	6.71	NA	NA
us-gaap:OtherNonoperatingIncomeExpense	▂▇█▁▄▄▃▄	-7.362	34.224	41.748	-17.381	9.355	7.031	-1.943	4.613	NA	NA
us-gaap:ProfitLoss	▂▂█▁▇▃▃▅▇▄	-129.103	-94.364	120.095	-150.838	80.253	-56.563	-65.098	-12.616	83.957	-33.665
us-gaap:RealizedInvestmentGainsLosses	▄	-2.659	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax	▁▁▁▄█▄▅▅█▄	20.804	13.63	8.999	181.902	394.072	177.963	215.197	239.067	415.332	179.313
us-gaap:Revenues	▁▁▁▄█▄▅▅█▄	23.137	14.378	8.999	181.902	394.072	177.963	215.197	239.067	415.332	179.313
us-gaap:SellingGeneralAndAdministrativeExpense	▅▁█▇██▇▇	74.95	60.325	86.667	84.186	86.854	87.767	83.484	83.159	NA	NA

		2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30

		2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
us-gaap:Assets	█▁▃▄	4121.839	3586.238	3719.206	3827.165	NA	NA	3315.759	NA	NA	NA
us-gaap:Liabilities	█▁▂▃	1411.991	785.234	844.766	988.248	NA	NA	662.294	NA	NA	NA
us-gaap:LiabilitiesAndStockholdersEquity	█▁▃▄	4121.839	3586.238	3719.206	3827.165	NA	NA	3315.759	NA	NA	NA
us-gaap:StockholdersEquity	▁▅█▆	2684.134	2771.933	2841.637	2798.915	NA	NA	2572.048	NA	NA	NA

		2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
us-gaap:AssetsCurrent	█▁▅█	1662.293	1179.065	1426.502	1649.358	NA	NA	1346.744	NA	NA	NA
us-gaap:CashAndCashEquivalentsAtCarryingValue	█▁▁▂▂▂▃▄	1451.352	925.779	906.555	1003.893	1009.127	958.993	1082.055	1151.428	NA	NA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	█▁▁▂▂▂▃▄	1477.559	953.586	924.304	1021.848	1027.025	969.048	1092.065	1159.489	NA	NA
us-gaap:ShortTermInvestments		NA	38.888	337.192	331.019	NA	NA	108.416	NA	NA	NA
us-gaap:ShortTermInvestments us-gaap:FinancialInstrument us-gaap:Deposits		NA	38.888	37.25	NA	NA	NA	NA	NA	NA	NA
us-gaap:AccountsReceivableNetCurrent	▃▂▁█	73.711	63.71	57.184	105.212	NA	NA	81.044	NA	NA	NA
us-gaap:OtherAssetsCurrent	▃▁▃█	23.787	15.647	22.633	40.581	NA	NA	39.43	NA	NA	NA

		2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
us-gaap:PropertyPlantAndEquipmentGross	█▆▃▁	2651.884	2530.712	2416.604	2302.156	NA	NA	2081.39	NA	NA	NA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	█▅▂▁	814.812	790.957	770.489	761.37	NA	NA	732.268	NA	NA	NA
us-gaap:AmortizationOfIntangibleAssets	▂▂▁▂█▂▅▂	2.884	2.884	2.72	3.009	4.944	2.905	3.988	3.151	NA	NA
us-gaap:PropertyPlantAndEquipmentNet	█▆▃▁	1837.072	1739.755	1646.115	1540.786	NA	NA	1349.122	NA	NA	NA
us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	▁▂▃█	49.626	50.982	52.622	61.998	NA	NA	84.56	NA	NA	NA
us-gaap:Goodwill	▁▁▁█	74.309	74.309	74.309	81.996	NA	NA	165.558	NA	NA	NA
us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill	▁▁▁█	63.801	63.801	63.801	64.881	NA	NA	65.421	NA	NA	NA
us-gaap:FiniteLivedIntangibleAssetsNet	▁▃▅█	144.658	147.542	150.426	155.948	NA	NA	214.391	NA	NA	NA
us-gaap:OperatingLeaseRightOfUseAsset	▁▃▅█	198.464	208.779	220.328	234.76	NA	NA	0.0	NA	NA	NA
us-gaap:OtherAssetsNoncurrent	▅█▅▁	91.616	122.005	85.103	37.438	NA	NA	89.963	NA	NA	NA
us-gaap:EquitySecuritiesFvNi	▂█▁	63.013	90.719	57.061	NA	NA	NA	17.26	NA	NA	NA

		2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
us-gaap:AccountsPayableCurrent	▁▂▇█	4.952	7.734	17.258	18.766	NA	NA	23.974	NA	NA	NA
us-gaap:ContractWithCustomerLiabilityCurrent	█▆▁█	205.641	202.008	189.308	206.045	NA	NA	186.883	NA	NA	NA
us-gaap:LiabilitiesCurrent	▂▁▃█	472.278	451.002	509.969	625.694	NA	NA	474.047	NA	NA	NA
us-gaap:LongTermDebtCurrent	▅██▁	5.115	5.398	5.429	4.792	NA	NA	6.042	NA	NA	NA
us-gaap:OperatingLeaseLiabilityCurrent	█▁▁▆	54.963	53.356	53.388	54.506	NA	NA	0.0	NA	NA	NA
us-gaap:OtherAccruedLiabilitiesCurrent	▄▁█▅	114.326	106.131	125.452	117.207	NA	NA	88.614	NA	NA	NA

		2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
us-gaap:LongTermDebt dei:LegalEntity,us-gaap:BalanceSheetLocation,us-gaap:LongtermDebtType msge:TaoGroupHospitality,us-gaap:Liability,us-gaap:SecuredDebt		NA	31.606	32.918	NA	NA	NA	NA	NA	NA	NA
us-gaap:LongTermDebt dei:LegalEntity,us-gaap:BalanceSheetLocation,us-gaap:LongtermDebtType msge:TaoGroupHospitality,us-gaap:OtherCurrentLiabilities,us-gaap:SecuredDebt		NA	4.761	4.792	NA	NA	NA	NA	NA	NA	NA
us-gaap:LongTermDebt dei:LegalEntity,us-gaap:BalanceSheetLocation,us-gaap:LongtermDebtType msge:TaoGroupHospitality,us-gaap:OtherNoncurrentLiabilities,us-gaap:SecuredDebt		NA	26.845	28.126	NA	NA	NA	NA	NA	NA	NA
us-gaap:LongTermDebtNoncurrent	█▁▁▁	649.445	26.845	28.126	29.962	NA	NA	48.556	NA	NA	NA
us-gaap:DeferredIncomeTaxLiabilitiesNet	▆▃▁█	12.927	12.632	12.45	13.131	NA	NA	22.973	NA	NA	NA
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	▁▂▂█	25.103	25.633	26.132	32.359	NA	NA	41.318	NA	NA	NA
us-gaap:MinorityInterest	▁▂▂█	11.171	11.773	12.203	17.002	NA	NA	13.79	NA	NA	NA
us-gaap:OtherLiabilitiesNoncurrent	▂█▂▁	78.138	80.19	78.279	77.77	NA	NA	59.525	NA	NA	NA
us-gaap:OperatingLeaseLiabilityNoncurrent	▁▃▅█	155.44	164.279	174.219	191.762	NA	NA	0.0	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	█▁	60.298	59.842	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree	█▁	56.801	56.368	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour	█▁	38.529	38.522	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	▁█	90.972	90.994	NA	NA	NA	NA	NA	NA	NA	NA

		2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
us-gaap:StockholdersEquity	▁▅█▆	2684.134	2771.933	2841.637	2798.915	NA	NA	2572.048	NA	NA	NA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	▅▇█▇▃▁▃▄▃	2695.305	2783.706	2853.84	2815.917	2622.692	2498.489	2585.838	2637.163	2586.607	NA
us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassA	██▁	0.196	0.196	0.195	NA	NA	NA	0.0	NA	NA	NA
us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassB	▄▄▄	0.045	0.045	0.045	NA	NA	NA	0.0	NA	NA	NA
us-gaap:AdditionalPaidInCapitalCommonStock	█▂▁	2782.042	2757.155	2751.318	NA	NA	NA	0.0	NA	NA	NA
us-gaap:RetainedEarningsAccumulatedDeficit	▁▅█	-72.768	52.091	141.936	NA	NA	NA	0.0	NA	NA	NA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax	█▅▂▂▆▁▃▅▄	-25.381	-37.554	-51.857	-52.607	-33.07	-56.602	-46.923	-37.187	-43.897	NA
us-gaap:MinorityInterest	▁▂▂█	11.171	11.773	12.203	17.002	NA	NA	13.79	NA	NA	NA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	█▁	24.892	11.808	NA	NA	NA	NA	NA	NA	NA	NA

		2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
us-gaap:NetCashProvidedByUsedInOperatingActivities	▄▁▄▆█▅▆	-51.791	-163.841	-40.92	33.193	122.929	-19.171	46.758	NA	NA	NA
us-gaap:NetCashProvidedByUsedInInvestingActivities	▅█▇▁▅▅▅	-47.648	194.33	88.327	-348.378	-62.996	-66.61	-71.212	NA	NA	NA
us-gaap:NetCashProvidedByUsedInFinancingActivities	█▂▁▅▂▂▂	621.431	-7.021	-143.962	307.785	-5.599	-35.286	-41.199	NA	NA	NA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	█▃▁▂▃▁▂	523.973	29.282	-97.544	-5.177	57.977	-123.017	-67.424	NA	NA	NA

		2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
us-gaap:DeferredIncomeTaxExpenseBenefit	██▇▁██▇	0.294	0.182	-0.679	-10.357	0.402	0.113	-1.165	NA	NA	NA
us-gaap:DepreciationDepletionAndAmortization	▁▆▂▅▇▆█▆	23.875	26.582	24.628	26.196	27.434	26.82	27.737	26.768	NA	NA
us-gaap:IncreaseDecreaseInAccountsReceivable	▇▇▃█▆▇▁	10.078	7.218	-46.805	22.454	-2.927	11.886	-70.091	NA	NA	NA
us-gaap:NetCashProvidedByUsedInOperatingActivities	▄▁▄▆█▅▆	-51.791	-163.841	-40.92	33.193	122.929	-19.171	46.758	NA	NA	NA
us-gaap:NetIncomeLoss	▁▂█▁▇▃▃▄▇▄	-124.859	-89.845	126.626	-128.586	78.915	-55.967	-59.289	-11.929	87.609	-31.345
us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents msge:MSGSportsCorpInvestment	▁█	-124.859	-89.845	NA	-128.586	81.306	-55.967	NA	-11.929	NA	NA
us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:Parent	▁█	-124.859	-89.845	NA	-128.586	81.306	-55.967	NA	-11.929	NA	NA
us-gaap:ProfitLoss	▂▂█▁▇▃▃▅▇▄	-129.103	-94.364	120.095	-150.838	80.253	-56.563	-65.098	-12.616	83.957	-33.665
us-gaap:ShareBasedCompensation	█▃▃▂▂▂▁	23.562	11.529	12.896	8.836	10.373	10.085	7.472	NA	NA	NA

		2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
us-gaap:NetCashProvidedByUsedInInvestingActivities	▅█▇▁▅▅▅	-47.648	194.33	88.327	-348.378	-62.996	-66.61	-71.212	NA	NA	NA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment	▆▆█▇▇▃▁	107.238	112.058	125.83	118.568	121.668	86.36	69.689	NA	NA	NA

		2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
us-gaap:NetCashProvidedByUsedInFinancingActivities	█▂▁▅▂▂▂	621.431	-7.021	-143.962	307.785	-5.599	-35.286	-41.199	NA	NA	NA
us-gaap:RepaymentsOfLongTermDebt		NA	1.25	NA	NA	NA	2.5	NA	NA	NA	NA

		2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30

Common Stock Value

us-gaap:CommonStockValue us-gaap:StatementClassOfStock

us-gaap:CommonStockValue

us-gaap:CommonClassA

Period End	2020-12-31	2020-09-30	2020-06-30	2019-06-30
Value	196000.0	196000.0	195000.0	0
Percentage of CommonStockValue	100.0	100.0	100.0	0.0
Percentage of Assets	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:CommonClassA	0.0	0.0	0.0	0.0

us-gaap:CommonClassB

Period End	2020-12-31	2020-09-30	2020-06-30	2019-06-30
Value	45000.0	45000.0	45000.0	0
Percentage of CommonStockValue	23.0	23.0	23.1	0.0
Percentage of Assets	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:CommonClassB	0.0	0.0	0.0	0.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonClassA

Period End	2020-12-31	2020-09-30	2020-06-30
Value	19	19	19
Percentage of CommonStockSharesOutstanding	100.0	100.0	100.0

Weighted Average Number Of Share Outstanding Basic And Diluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	24	24	23	23
Percentage of WeightedAverageNumberOfShareOutstandingBasicAndDiluted	100.0	100.0	100.0	100.0

Earnings Per Share Basic And Diluted

us-gaap:EarningsPerShareBasicAndDiluted

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	-5.17	-3.69	5.09	-5.36	3.39	-2.33	-2.47	-0.5	3.65	-1.31
Percentage of EarningsPerShareBasicAndDiluted	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	23	11	12	8.836	10	10	7.472	8.726
Percentage of AllocatedShareBasedCompensationExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	113.3	84.6	143.3	4.9	2.6	5.7	3.5	3.7

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	-112.686	-75.542	121	-148.123	104	-65.646	-70.608	-5.219
Percentage of ComprehensiveIncomeNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-541.7	-554.2	1348.3	-81.4	26.6	-36.9	-32.8	-2.2

us-gaap:ComprehensiveIncomeNetOfTax us-gaap:StatementEquityComponents

us-gaap:Parent

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	-112.686	-75.542	-148.123	104	-65.646	-5.219
Percentage of ComprehensiveIncomeNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-541.7	-554.2	-81.4	26.6	-36.9	-2.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parent	0.0	0.0	0.0	0.0	0.0	0.0

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:NoncontrollingInterest

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	-902000.0	-630000.0	195000.0	453000.0	40000.0	-680000.0
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-4.3	-4.6	0.1	0.1	0.0	-0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest	0.0	0.0	0.0	0.0	0.0	0.0

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	-116.93	-80.061	113	-170.375	106	-66.242	-76.069	-5.906
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-562.1	-587.4	1258.2	-93.7	26.9	-37.2	-35.3	-2.5

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	-128.78	-94.201	127	-160.964	83	-56.378	-67.143	-12.147
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-619.0	-691.1	1417.9	-88.5	21.3	-31.7	-31.2	-5.1

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	0.323	0.163	13	-10.126	1.255	0.185	-0.81	0.469
Percentage of IncomeTaxExpenseBenefit	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.6	1.2	152.6	-5.6	0.3	0.1	-0.4	0.2

Income Taxes Paid

us-gaap:IncomeTaxesPaid

Period End	2020-12-31	2020-09-30
Value	0.0	15
Percentage of IncomeTaxesPaid	0.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.0	113.9

Interest Expense

us-gaap:InterestExpense

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	7.675	0.409	0.446	0.605	0.144	1.105	5.186	3.247
Percentage of InterestExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	36.9	3.0	5.0	0.3	0.0	0.6	2.4	1.4

Net Income Loss

us-gaap:NetIncomeLoss

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	-124.859	-89.845	126	-128.586	78	-55.967	-59.289	-11.929	87	-31.345
Percentage of NetIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-600.2	-659.2	1407.1	-70.7	20.0	-31.4	-27.6	-5.0	21.1	-17.5

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

msge:MSGSportsCorpInvestment

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	-124.859	-89.845	-128.586	81	-55.967	-11.929
Percentage of NetIncomeLoss	100.0	100.0	100.0	103.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-600.2	-659.2	-70.7	20.6	-31.4	-5.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax msge:MSGSportsCorpInvestment	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:Parent

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	-124.859	-89.845	-128.586	81	-55.967	-11.929
Percentage of NetIncomeLoss	100.0	100.0	100.0	103.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-600.2	-659.2	-70.7	20.6	-31.4	-5.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parent	0.0	0.0	0.0	0.0	0.0	0.0

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	-16.256	32	41	-15.423	14	11	-9.055	6.472
Percentage of NonoperatingIncomeExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-78.1	237.8	459.6	-8.5	3.6	6.6	-4.2	2.7

Operating Income Loss

us-gaap:OperatingIncomeLoss

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	-112.524	-126.615	94	-145.541	67	-68.146	-57.213	-18.619	84	-51.604
Percentage of OperatingIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-540.9	-928.9	1048.6	-80.0	17.1	-38.3	-26.6	-7.8	20.3	-28.8

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	-0.263	-0.262	-0.075	-0.075
Percentage of OperatingIncomeLoss	0.2	0.2	-0.1	0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-1.3	-1.9	-0.0	-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination	1143.5	65.8	18.7	24.5

us-gaap:MaterialReconcilingItems

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	-3.99	-4.446	-4.963	-3.974
Percentage of OperatingIncomeLoss	3.5	3.5	-7.4	5.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-19.2	-32.6	-1.3	-2.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MaterialReconcilingItems	0.0	0.0	0.0	0.0

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, msge:MadisonSquareGardenEntertainment

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	-97.088	-110.651	67	-67.444
Percentage of OperatingIncomeLoss	86.3	87.4	99.9	99.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-466.7	-811.8	17.0	-37.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments msge:MadisonSquareGardenEntertainment	-939.3	-1625.5	20.6	-56.4

us-gaap:OperatingSegments, msge:TaoGroupHospitality

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	-11.183	-11.256	7.496	3.347
Percentage of OperatingIncomeLoss	9.9	8.9	11.2	-4.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-53.8	-82.6	1.9	1.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments msge:TaoGroupHospitality	-106.6	-155.9	10.8	5.7

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	11	13	-19.946	23	-10.018	6.383
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	57.1	102.4	-11.0	5.9	-5.6	2.7

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	12	14	-0.644	-19.537	23	-9.679	-9.736	6.71
Percentage of OtherComprehensiveIncomeLossNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	58.5	104.9	-7.2	-10.7	6.0	-5.4	-4.5	2.8

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	12	14	-0.644	-19.537	23	-9.679	-9.736	6.71
Percentage of OtherComprehensiveIncomeLossNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	58.5	104.9	-7.2	-10.7	6.0	-5.4	-4.5	2.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:Parent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	12	14	-0.644	-19.537	23	-9.679	-9.736	6.71
Percentage of OtherComprehensiveIncomeLossNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	58.5	104.9	-7.2	-10.7	6.0	-5.4	-4.5	2.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parent	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	-7.362	34	41	-17.381	9.355	7.031	-1.943	4.613
Percentage of OtherNonoperatingIncomeExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-35.4	251.1	463.9	-9.6	2.4	4.0	-0.9	1.9

Profit Loss

us-gaap:ProfitLoss

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	-129.103	-94.364	120	-150.838	80	-56.563	-65.098	-12.616	83	-33.665
Percentage of ProfitLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-620.6	-692.3	1334.5	-82.9	20.4	-31.8	-30.3	-5.3	20.2	-18.8

Realized Investment Gains Losses

us-gaap:RealizedInvestmentGainsLosses

Period End	2020-12-31
Value	-2659000.0
Percentage of RealizedInvestmentGainsLosses	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-12.8

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	20	13	8.999	181	394	177	215	239	415	179
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	-0.023	-0.398	-0.402	-0.306
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.1	-2.9	-0.1	-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.1	-2.9	-0.1	-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:ProductOrService

us-gaap:IntersegmentElimination, msge:RevenuesfromEntertainmentDiningandNightlifeOfferings

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	-0.044	-0.166	-0.083	-0.013
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.2	-1.2	-0.0	-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.2	-1.2	-0.0	-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination msge:RevenuesfromEntertainmentDiningandNightlifeOfferings	100.0	100.0	100.0	100.0

us-gaap:IntersegmentElimination, msge:SponsorshipandSignageSuiteandAdvertisingCommissionRevenues

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	0.021	-0.232	-0.22	-0.217
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.1	-1.7	-0.1	-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.1	-1.7	-0.1	-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination msge:SponsorshipandSignageSuiteandAdvertisingCommissionRevenues	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, msge:RevenuesfromEntertainmentDiningandNightlifeOfferings, msge:TaoGroupHospitality

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	10	7.221	69	58
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	50.4	53.0	17.5	32.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	50.4	53.0	17.5	32.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments msge:RevenuesfromEntertainmentDiningandNightlifeOfferings msge:TaoGroupHospitality	100.0	100.0	100.0	100.0

us-gaap:OperatingSegments, msge:SponsorshipandSignageSuiteandAdvertisingCommissionRevenues, msge:MadisonSquareGardenEntertainment

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	9.13	5.859	85	38
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	43.9	43.0	21.6	21.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	43.9	43.0	21.6	21.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments msge:SponsorshipandSignageSuiteandAdvertisingCommissionRevenues msge:MadisonSquareGardenEntertainment	100.0	100.0	100.0	100.0

us-gaap:OperatingSegments, msge:TicketingandVenueLicenseFeeRevenues, msge:MadisonSquareGardenEntertainment

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	0.968	0.73	199	61
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	4.7	5.4	50.7	34.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	4.7	5.4	50.7	34.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments msge:TicketingandVenueLicenseFeeRevenues msge:MadisonSquareGardenEntertainment	100.0	100.0	100.0	100.0

us-gaap:OperatingSegments, us-gaap:ProductAndServiceOther, msge:MadisonSquareGardenEntertainment

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	0.238	0.218	5.681	4.089
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.1	1.6	1.4	2.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.1	1.6	1.4	2.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:ProductAndServiceOther msge:MadisonSquareGardenEntertainment	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments, us-gaap:TimingOfTransferOfGoodOrService

us-gaap:OperatingSegments, msge:Eventrelated, msge:MadisonSquareGardenEntertainment, us-gaap:TransferredAtPointInTime

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	1.002	0.727	242	82
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	4.8	5.3	61.5	46.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	4.8	5.3	61.5	46.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments msge:Eventrelated msge:MadisonSquareGardenEntertainment us-gaap:TransferredAtPointInTime	100.0	100.0	100.0	100.0

us-gaap:OperatingSegments, msge:Eventrelated, msge:TaoGroupHospitality, us-gaap:TransferredAtPointInTime

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	9.179	5.66	63	52
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	44.1	41.5	16.1	29.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	44.1	41.5	16.1	29.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments msge:Eventrelated msge:TaoGroupHospitality us-gaap:TransferredAtPointInTime	100.0	100.0	100.0	100.0

us-gaap:OperatingSegments, msge:Sponsorshipsignageandsuitelicenses, msge:MadisonSquareGardenEntertainment, us-gaap:TransferredOverTime

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	6.064	2.46	74	35
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	29.1	18.0	18.9	19.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	29.1	18.0	18.9	19.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments msge:Sponsorshipsignageandsuitelicenses msge:MadisonSquareGardenEntertainment us-gaap:TransferredOverTime	100.0	100.0	100.0	100.0

us-gaap:OperatingSegments, msge:Sponsorshipsignageandsuitelicenses, msge:TaoGroupHospitality, us-gaap:TransferredOverTime

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	0.414	0.072	0.039	0.184
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	2.0	0.5	0.0	0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	2.0	0.5	0.0	0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments msge:Sponsorshipsignageandsuitelicenses msge:TaoGroupHospitality us-gaap:TransferredOverTime	100.0	100.0	100.0	100.0

us-gaap:OperatingSegments, us-gaap:ProductAndServiceOther, msge:MadisonSquareGardenEntertainment, us-gaap:TransferredAtPointInTime

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	3.27	3.62	8.195	1.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	15.7	26.6	2.1	0.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	15.7	26.6	2.1	0.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:ProductAndServiceOther msge:MadisonSquareGardenEntertainment us-gaap:TransferredAtPointInTime	100.0	100.0	100.0	100.0

us-gaap:OperatingSegments, us-gaap:ProductAndServiceOther, msge:TaoGroupHospitality, us-gaap:TransferredAtPointInTime

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	0.898	1.489	5.809	6.092
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	4.3	10.9	1.5	3.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	4.3	10.9	1.5	3.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments us-gaap:ProductAndServiceOther msge:TaoGroupHospitality us-gaap:TransferredAtPointInTime	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:ProductOrService, us-gaap:TimingOfTransferOfGoodOrService

us-gaap:IntersegmentElimination, msge:Eventrelated, us-gaap:TransferredAtPointInTime

Period End	2020-12-31	2019-12-31	2019-09-30
Value	-0.043	-0.083	-0.013
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.2	-0.0	-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.2	-0.0	-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination msge:Eventrelated us-gaap:TransferredAtPointInTime	100.0	100.0	100.0

us-gaap:IntersegmentElimination, msge:Sponsorshipsignageandsuitelicenses, us-gaap:TransferredOverTime

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	0.021	-0.232	-0.22	-0.217
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.1	-1.7	-0.1	-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.1	-1.7	-0.1	-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination msge:Sponsorshipsignageandsuitelicenses us-gaap:TransferredOverTime	100.0	100.0	100.0	100.0

us-gaap:IntersegmentElimination, us-gaap:ProductAndServiceOther, us-gaap:TransferredAtPointInTime

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	-0.001	-0.166	-0.099	-0.076
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.0	-1.2	-0.0	-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.0	-1.2	-0.0	-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination us-gaap:ProductAndServiceOther us-gaap:TransferredAtPointInTime	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, msge:MadisonSquareGardenEntertainment

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	10	6.807	325	119
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	49.7	49.9	82.6	67.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	49.7	49.9	82.6	67.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments msge:MadisonSquareGardenEntertainment	100.0	100.0	100.0	100.0

us-gaap:OperatingSegments, msge:TaoGroupHospitality

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	10	7.221	69	58
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	50.4	53.0	17.5	32.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	50.4	53.0	17.5	32.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments msge:TaoGroupHospitality	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

msge:RevenuesfromEntertainmentDiningandNightlifeOfferings

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	10	7.055	69	58
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	50.2	51.8	17.5	32.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	50.2	51.8	17.5	32.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax msge:RevenuesfromEntertainmentDiningandNightlifeOfferings	100.0	100.0	100.0	100.0

msge:SponsorshipandSignageSuiteandAdvertisingCommissionRevenues

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	9.151	5.627	85	37
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	44.0	41.3	21.6	21.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	44.0	41.3	21.6	21.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax msge:SponsorshipandSignageSuiteandAdvertisingCommissionRevenues	100.0	100.0	100.0	100.0

msge:TicketingandVenueLicenseFeeRevenues

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	0.968	0.73	199	61
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	4.7	5.4	50.7	34.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	4.7	5.4	50.7	34.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax msge:TicketingandVenueLicenseFeeRevenues	100.0	100.0	100.0	100.0

us-gaap:ProductAndServiceOther

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	0.238	0.218	5.582	4.013
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.1	1.6	1.4	2.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.1	1.6	1.4	2.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductAndServiceOther	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:TimingOfTransferOfGoodOrService

msge:Eventrelated, us-gaap:TransferredAtPointInTime

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	10	6.387	305	135
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	48.7	46.9	77.6	75.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	48.7	46.9	77.6	75.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax msge:Eventrelated us-gaap:TransferredAtPointInTime	100.0	100.0	100.0	100.0

msge:Sponsorshipsignageandsuitelicenses, us-gaap:TransferredOverTime

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	6.499	2.3	74	35
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	31.2	16.9	18.9	19.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	31.2	16.9	18.9	19.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax msge:Sponsorshipsignageandsuitelicenses us-gaap:TransferredOverTime	100.0	100.0	100.0	100.0

us-gaap:ProductAndServiceOther, us-gaap:TransferredAtPointInTime

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	4.167	4.943	13	7.516
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	20.0	36.3	3.5	4.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	20.0	36.3	3.5	4.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductAndServiceOther us-gaap:TransferredAtPointInTime	100.0	100.0	100.0	100.0

Revenues

us-gaap:Revenues

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	23	14	8.999	181	394	177	215	239	415	179
Percentage of Revenues	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	111.2	105.5	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:Revenues us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	-0.023	-0.398	-0.402	-0.306
Percentage of Revenues	-0.1	-2.8	-0.1	-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.1	-2.9	-0.1	-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination	100.0	100.0	100.0	100.0

us-gaap:Revenues us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, msge:MadisonSquareGardenEntertainment

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	12	7.555	325	119
Percentage of Revenues	54.8	52.5	82.6	67.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	60.9	55.4	82.6	67.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments msge:MadisonSquareGardenEntertainment	122.6	111.0	100.0	100.0

us-gaap:OperatingSegments, msge:TaoGroupHospitality

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	10	7.221	69	58
Percentage of Revenues	45.3	50.2	17.5	32.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	50.4	53.0	17.5	32.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments msge:TaoGroupHospitality	100.0	100.0	100.0	100.0

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	74	60	86	84	86	87	83	83
Percentage of SellingGeneralAndAdministrativeExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	360.3	442.6	963.1	46.3	22.0	49.3	38.8	34.8

us-gaap:SellingGeneralAndAdministrativeExpense us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	0.089	0.072	-0.053	-0.012
Percentage of SellingGeneralAndAdministrativeExpense	0.1	0.1	-0.1	-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.4	0.5	-0.0	-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination	-387.0	-18.1	13.2	3.9

us-gaap:SellingGeneralAndAdministrativeExpense us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, msge:MadisonSquareGardenEntertainment

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	65	52	68	70
Percentage of SellingGeneralAndAdministrativeExpense	87.7	87.3	79.3	80.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	315.9	386.3	17.5	39.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments msge:MadisonSquareGardenEntertainment	635.9	773.5	21.2	58.8

us-gaap:OperatingSegments, msge:TaoGroupHospitality

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	9.131	7.603	18	17
Percentage of SellingGeneralAndAdministrativeExpense	12.2	12.6	20.8	19.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	43.9	55.8	4.6	9.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments msge:TaoGroupHospitality	87.0	105.3	26.1	29.7

Assets

us-gaap:Assets

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	4121	3586	3719	3827	3315
Percentage of Assets	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	100.0	100.0	100.0	100.0	100.0

Liabilities

us-gaap:Liabilities

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	1411	785	844	988	662
Percentage of Liabilities	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	34.3	21.9	22.7	25.8	20.0

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	4121	3586	3719	3827	3315
Percentage of LiabilitiesAndStockholdersEquity	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	100.0	100.0	100.0	100.0	100.0

Stockholders Equity

us-gaap:StockholdersEquity

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	2684	2771	2841	2798	2572
Percentage of StockholdersEquity	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	65.1	77.3	76.4	73.1	77.6

Assets Current

us-gaap:AssetsCurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	1662	1179	1426	1649	1346
Percentage of AssetsCurrent	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	40.3	32.9	38.4	43.1	40.6

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-06-30	2017-06-30
Value	1451	925	906	1003	1009	958	1082	1151	1225	1237
Percentage of CashAndCashEquivalentsAtCarryingValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	35.2	25.8	24.4	26.2	0.0	0.0	32.6	0.0	0.0	0.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-06-30	2017-06-30
Value	1477	953	924	1021	1027	969	1092	1159	1232	1241
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	35.8	26.6	24.9	26.7	0.0	0.0	32.9	0.0	0.0	0.0

Short Term Investments

us-gaap:ShortTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	38	337	331	108
Percentage of ShortTermInvestments	100.0	100.0	100.0	100.0
Percentage of Assets	1.1	9.1	8.6	3.3

us-gaap:ShortTermInvestments us-gaap:FinancialInstrument

us-gaap:Deposits

Period End	2020-09-30	2020-06-30
Value	38	37
Percentage of ShortTermInvestments	100.0	11.0
Percentage of Assets	1.1	1.0
Percentage of Assets us-gaap:Deposits	0.0	0.0

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	73	63	57	105	81
Percentage of AccountsReceivableNetCurrent	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	1.8	1.8	1.5	2.7	2.4

Other Assets Current

us-gaap:OtherAssetsCurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	23	15	22	40	39
Percentage of OtherAssetsCurrent	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.6	0.4	0.6	1.1	1.2

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	2651	2530	2416	2302	2081
Percentage of PropertyPlantAndEquipmentGross	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	64.3	70.6	65.0	60.2	62.8

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Building

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	994	994	993	992	1091
Percentage of PropertyPlantAndEquipmentGross	37.5	39.3	41.1	43.1	52.5
Percentage of Assets	24.1	27.7	26.7	25.9	32.9
Percentage of Assets us-gaap:Building	0.0	0.0	0.0	0.0	0.0

us-gaap:ConstructionInProgress

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	895	797	685	574	232
Percentage of PropertyPlantAndEquipmentGross	33.8	31.5	28.4	25.0	11.2
Percentage of Assets	21.7	22.2	18.4	15.0	7.0
Percentage of Assets us-gaap:ConstructionInProgress	0.0	0.0	0.0	0.0	0.0

us-gaap:Equipment

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	361	345	345	329	318
Percentage of PropertyPlantAndEquipmentGross	13.6	13.6	14.3	14.3	15.3
Percentage of Assets	8.8	9.6	9.3	8.6	9.6
Percentage of Assets us-gaap:Equipment	0.0	0.0	0.0	0.0	0.0

us-gaap:FurnitureAndFixtures

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	42	41	42	42	53
Percentage of PropertyPlantAndEquipmentGross	1.6	1.7	1.8	1.8	2.6
Percentage of Assets	1.0	1.2	1.1	1.1	1.6
Percentage of Assets us-gaap:FurnitureAndFixtures	0.0	0.0	0.0	0.0	0.0

us-gaap:Land

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	149	144	141	141	167
Percentage of PropertyPlantAndEquipmentGross	5.6	5.7	5.9	6.2	8.0
Percentage of Assets	3.6	4.0	3.8	3.7	5.0
Percentage of Assets us-gaap:Land	0.0	0.0	0.0	0.0	0.0

us-gaap:LeaseholdImprovements

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	169	168	170	183	180
Percentage of PropertyPlantAndEquipmentGross	6.4	6.7	7.1	8.0	8.7
Percentage of Assets	4.1	4.7	4.6	4.8	5.4
Percentage of Assets us-gaap:LeaseholdImprovements	0.0	0.0	0.0	0.0	0.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	814	790	770	761	732
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	19.8	22.1	20.7	19.9	22.1

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	2.884	2.884	2.72	3.009	4.944	2.905	3.988	3.151
Percentage of AmortizationOfIntangibleAssets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	1837	1739	1646	1540	1349
Percentage of PropertyPlantAndEquipmentNet	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	44.6	48.5	44.3	40.3	40.7

Investments In Affiliates Subsidiaries Associates And Joint Ventures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	49	50	52	61	84
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	1.2	1.4	1.4	1.6	2.6

Goodwill

us-gaap:Goodwill

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30	2018-06-30
Value	74	74	74	81	165	147
Percentage of Goodwill	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	1.8	2.1	2.0	2.1	5.0	0.0

Indefinite Lived Intangible Assets Excluding Goodwill

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	63	63	63	64	65
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	1.5	1.8	1.7	1.7	2.0

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass

us-gaap:ArtisticRelatedIntangibleAssets

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	1.92	1.92	1.92	3.0	3.0
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill	3.0	3.0	3.0	4.6	4.6
Percentage of Assets	0.0	0.1	0.1	0.1	0.1
Percentage of Assets us-gaap:ArtisticRelatedIntangibleAssets	0.0	0.0	0.0	0.0	0.0

us-gaap:Trademarks

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	61	61	61	61	62
Percentage of IndefiniteLivedIntangibleAssetsExcludingGoodwill	97.0	97.0	97.0	95.4	95.4
Percentage of Assets	1.5	1.7	1.7	1.6	1.9
Percentage of Assets us-gaap:Trademarks	0.0	0.0	0.0	0.0	0.0

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	144	147	150	155	214
Percentage of FiniteLivedIntangibleAssetsNet	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	3.5	4.1	4.0	4.1	6.5

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

msge:FestivalRights

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	5.654	5.789	5.924	6.06	6.463
Percentage of FiniteLivedIntangibleAssetsNet	3.9	3.9	3.9	3.9	3.0
Percentage of Assets	0.1	0.2	0.2	0.2	0.2
Percentage of Assets msge:FestivalRights	0.0	0.0	0.0	0.0	0.0

msge:VenueManagementContracts

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	61	62	63	65	69
Percentage of FiniteLivedIntangibleAssetsNet	42.3	42.2	42.2	42.1	32.2
Percentage of Assets	1.5	1.7	1.7	1.7	2.1
Percentage of Assets msge:VenueManagementContracts	0.0	0.0	0.0	0.0	0.0

us-gaap:NoncompeteAgreements

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	2.869	3.26	3.652	4.435	5.609
Percentage of FiniteLivedIntangibleAssetsNet	2.0	2.2	2.4	2.8	2.6
Percentage of Assets	0.1	0.1	0.1	0.1	0.2
Percentage of Assets us-gaap:NoncompeteAgreements	0.0	0.0	0.0	0.0	0.0

us-gaap:OtherIntangibleAssets

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	0.543	0.613	0.684	0.755	2.151
Percentage of FiniteLivedIntangibleAssetsNet	0.4	0.4	0.5	0.5	1.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.1
Percentage of Assets us-gaap:OtherIntangibleAssets	0.0	0.0	0.0	0.0	0.0

us-gaap:TradeNames

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	74	75	76	79	87
Percentage of FiniteLivedIntangibleAssetsNet	51.5	51.2	51.0	50.7	40.7
Percentage of Assets	1.8	2.1	2.1	2.1	2.6
Percentage of Assets us-gaap:TradeNames	0.0	0.0	0.0	0.0	0.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-07-01	2019-06-30
Value	198	208	220	234	259	0.0
Percentage of OperatingLeaseRightOfUseAsset	100.0	100.0	100.0	100.0	100.0	0.0
Percentage of Assets	4.8	5.8	5.9	6.1	0.0	0.0

us-gaap:OperatingLeaseRightOfUseAsset us-gaap:BalanceSheetLocation

msge:RightofUseLeaseAssets

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31
Value	198	208	220	234
Percentage of OperatingLeaseRightOfUseAsset	100.0	100.0	100.0	100.0
Percentage of Assets	4.8	5.8	5.9	6.1
Percentage of Assets msge:RightofUseLeaseAssets	0.0	0.0	0.0	0.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	91	122	85	37	89
Percentage of OtherAssetsNoncurrent	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	2.2	3.4	2.3	1.0	2.7

Equity Securities Fv Ni

us-gaap:EquitySecuritiesFvNi

Period End	2020-12-31	2020-09-30	2020-06-30	2019-06-30
Value	63	90	57	17
Percentage of EquitySecuritiesFvNi	100.0	100.0	100.0	100.0
Percentage of Assets	1.5	2.5	1.5	0.5

us-gaap:EquitySecuritiesFvNi us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument

msge:Draftkings, us-gaap:CommonStock

Period End	2020-12-31	2020-09-30	2020-06-30
Value	41	75	42
Percentage of EquitySecuritiesFvNi	66.1	83.1	74.6
Percentage of Assets	1.0	2.1	1.1
Percentage of Assets msge:Draftkings us-gaap:CommonStock	0.0	0.0	0.0

msge:Draftkings, us-gaap:Warrant

Period End	2020-09-30	2020-06-30
Value	0.425	0.132
Percentage of EquitySecuritiesFvNi	0.5	0.2
Percentage of Assets	0.0	0.0
Percentage of Assets msge:Draftkings us-gaap:Warrant	0.0	0.0

msge:Townsquare, us-gaap:CommonStock

Period End	2020-12-31	2020-09-30	2020-06-30
Value	21	14	14
Percentage of EquitySecuritiesFvNi	33.9	16.5	25.1
Percentage of Assets	0.5	0.4	0.4
Percentage of Assets msge:Townsquare us-gaap:CommonStock	0.0	0.0	0.0

Accounts Payable Current

us-gaap:AccountsPayableCurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	4.952	7.734	17	18	23
Percentage of AccountsPayableCurrent	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.1	0.2	0.5	0.5	0.7

Contract With Customer Liability Current

us-gaap:ContractWithCustomerLiabilityCurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	205	202	189	206	186
Percentage of ContractWithCustomerLiabilityCurrent	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	5.0	5.6	5.1	5.4	5.6

Liabilities Current

us-gaap:LiabilitiesCurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	472	451	509	625	474
Percentage of LiabilitiesCurrent	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	11.5	12.6	13.7	16.3	14.3

Long Term Debt Current

us-gaap:LongTermDebtCurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	5115000.0	5398000.0	5429000.0	4792000.0	6042000.0
Percentage of LongTermDebtCurrent	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.1	0.2	0.1	0.1	0.2

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-07-01	2019-06-30
Value	54	53	53	54	50	0.0
Percentage of OperatingLeaseLiabilityCurrent	100.0	100.0	100.0	100.0	100.0	0.0
Percentage of Assets	1.3	1.5	1.4	1.4	0.0	0.0

us-gaap:OperatingLeaseLiabilityCurrent us-gaap:BalanceSheetLocation

msge:Currentportionofrightofuseleaseliabilities

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31
Value	54	53	53	54
Percentage of OperatingLeaseLiabilityCurrent	100.0	100.0	100.0	100.0
Percentage of Assets	1.3	1.5	1.4	1.4
Percentage of Assets msge:Currentportionofrightofuseleaseliabilities	0.0	0.0	0.0	0.0

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	114	106	125	117	88
Percentage of OtherAccruedLiabilitiesCurrent	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	2.8	3.0	3.4	3.1	2.7

us-gaap:OtherAccruedLiabilitiesCurrent us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PropertyPlantAndEquipmentOtherTypes

Period End	2020-12-31	2020-09-30	2020-06-30
Value	76	76	78
Percentage of OtherAccruedLiabilitiesCurrent	67.3	72.5	62.7
Percentage of Assets	1.9	2.1	2.1
Percentage of Assets us-gaap:PropertyPlantAndEquipmentOtherTypes	0.0	0.0	0.0

Long Term Debt

us-gaap:LongTermDebt dei:LegalEntity, us-gaap:BalanceSheetLocation, us-gaap:LongtermDebtType

us-gaap:LongTermDebt

msge:TaoGroupHospitality, us-gaap:Liability, us-gaap:SecuredDebt

Period End	2020-09-30	2020-06-30
Value	31	32
Percentage of LongTermDebt	100.0	100.0
Percentage of Assets	0.9	0.9
Percentage of Assets msge:TaoGroupHospitality us-gaap:Liability us-gaap:SecuredDebt	0.0	0.0

msge:TaoGroupHospitality, us-gaap:OtherCurrentLiabilities, us-gaap:SecuredDebt

Period End	2020-09-30	2020-06-30
Value	4.761	4.792
Percentage of LongTermDebt	15.1	14.6
Percentage of Assets	0.1	0.1
Percentage of Assets msge:TaoGroupHospitality us-gaap:OtherCurrentLiabilities us-gaap:SecuredDebt	0.0	0.0

msge:TaoGroupHospitality, us-gaap:OtherNoncurrentLiabilities, us-gaap:SecuredDebt

Period End	2020-09-30	2020-06-30
Value	26	28
Percentage of LongTermDebt	84.9	85.4
Percentage of Assets	0.7	0.8
Percentage of Assets msge:TaoGroupHospitality us-gaap:OtherNoncurrentLiabilities us-gaap:SecuredDebt	0.0	0.0

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	649	26	28	29	48
Percentage of LongTermDebtNoncurrent	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	15.8	0.7	0.8	0.8	1.5

us-gaap:LongTermDebtNoncurrent us-gaap:StatementScenario, us-gaap:LongtermDebtType

srt:ScenarioForecast, msg:SeniorNotesOrTermLoanAndRevolverFacilities

Period End	2020-09-30
Value	500
Percentage of LongTermDebtNoncurrent	1862.5
Percentage of Assets	13.9
Percentage of Assets srt:ScenarioForecast msg:SeniorNotesOrTermLoanAndRevolverFacilities	0.0

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	12	12	12	13	22
Percentage of DeferredIncomeTaxLiabilitiesNet	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.3	0.4	0.3	0.3	0.7

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	25	25	26	32	41
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.6	0.7	0.7	0.8	1.2

Minority Interest

us-gaap:MinorityInterest

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	11	11	12	17	13
Percentage of MinorityInterest	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.3	0.3	0.3	0.4	0.4

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	78	80	78	77	59
Percentage of OtherLiabilitiesNoncurrent	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	1.9	2.2	2.1	2.0	1.8

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-07-01	2019-06-30
Value	155	164	174	191	206	0.0
Percentage of OperatingLeaseLiabilityNoncurrent	100.0	100.0	100.0	100.0	100.0	0.0
Percentage of Assets	3.8	4.6	4.7	5.0	0.0	0.0

us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:BalanceSheetLocation

msge:Longtermrightofuseleaseliabilities

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31
Value	155	164	174	191
Percentage of OperatingLeaseLiabilityNoncurrent	100.0	100.0	100.0	100.0
Percentage of Assets	3.8	4.6	4.7	5.0
Percentage of Assets msge:Longtermrightofuseleaseliabilities	0.0	0.0	0.0	0.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

Period End	2020-12-31	2020-09-30
Value	60	59
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	100.0	100.0
Percentage of Assets	1.5	1.7

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

Period End	2020-12-31	2020-09-30
Value	56	56
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree	100.0	100.0
Percentage of Assets	1.4	1.6

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

Period End	2020-12-31	2020-09-30
Value	38	38
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour	100.0	100.0
Percentage of Assets	0.9	1.1

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

Period End	2020-12-31	2020-09-30
Value	90	90
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	100.0	100.0
Percentage of Assets	2.2	2.5

Operating Lease Liability

us-gaap:OperatingLeaseLiability

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31
Value	210	217	227	246
Percentage of OperatingLeaseLiability	100.0	100.0	100.0	100.0
Percentage of Assets	5.1	6.1	6.1	6.4

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

Period End	2020-12-31	2020-09-30
Value	295	306
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue	100.0	100.0
Percentage of Assets	7.2	8.5

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

Period End	2020-12-31	2020-09-30
Value	84	88
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	100.0	100.0
Percentage of Assets	2.1	2.5

Stockholders Equity

us-gaap:StockholdersEquity

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	2684	2771	2841	2798	2572
Percentage of StockholdersEquity	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	65.1	77.3	76.4	73.1	77.6

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-06-30	2017-06-30
Value	2695	2783	2853	2815	2622	2498	2585	2637	2586	2489	2454
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	65.4	77.6	76.7	73.6	0.0	0.0	78.0	0.0	0.0	0.0	0.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

msge:MSGSportsCorpInvestment

Period End	2020-12-31	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-06-30
Value	-72.768	2851	2638	2539	2618	2657	2616	2525
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-2.7	101.3	100.6	101.6	101.3	100.8	101.1	101.4
Percentage of Assets	-1.8	74.5	0.0	0.0	79.0	0.0	0.0	0.0
Percentage of Assets msge:MSGSportsCorpInvestment	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AccumulatedOtherComprehensiveIncome

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-06-30	2017-06-30
Value	-25.381	-37.554	-51.857	-52.607	-33.07	-56.602	-46.923	-37.187	-43.897	-46.918	-34.115
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-0.9	-1.3	-1.8	-1.9	-1.3	-2.3	-1.8	-1.4	-1.7	-1.9	-1.4
Percentage of Assets	-0.6	-1.0	-1.4	-1.4	0.0	0.0	-1.4	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AdditionalPaidInCapital

Period End	2020-12-31	2020-09-30	2020-06-30	2019-06-30	2018-06-30	2017-06-30
Value	2782	2757	2751	0.0	0.0	0.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	103.2	99.0	96.4	0.0	0.0	0.0
Percentage of Assets	67.5	76.9	74.0	0.0	0.0	0.0
Percentage of Assets us-gaap:AdditionalPaidInCapital	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:CommonStock

Period End	2020-12-31	2020-09-30	2020-06-30	2019-06-30	2018-06-30	2017-06-30
Value	0.241	0.241	0.24	0.0	0.0	0.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:CommonStock	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:NoncontrollingInterest

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-06-30	2017-06-30
Value	11	11	12	17	16	15	13	16	14	11	11
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	0.4	0.4	0.4	0.6	0.6	0.6	0.5	0.6	0.6	0.5	0.5
Percentage of Assets	0.3	0.3	0.3	0.4	0.0	0.0	0.4	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:NoncontrollingInterest	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:Parent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-06-30	2017-06-30
Value	2684	2771	2841	2798	2605	2482	2572	2620	2572	2478	2442
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	99.6	99.6	99.6	99.4	99.4	99.4	99.5	99.4	99.4	99.5	99.5
Percentage of Assets	65.1	77.3	76.4	73.1	0.0	0.0	77.6	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:Parent	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:RetainedEarnings

Period End	2020-12-31	2020-09-30	2020-06-30	2019-06-30	2018-06-30	2017-06-30
Value	-72.768	52	141	0.0	0.0	0.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-2.7	1.9	5.0	0.0	0.0	0.0
Percentage of Assets	-1.8	1.5	3.8	0.0	0.0	0.0
Percentage of Assets us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0

Common Stock Value

us-gaap:CommonStockValue us-gaap:StatementClassOfStock

us-gaap:CommonStockValue

us-gaap:CommonClassA

Period End	2020-12-31	2020-09-30	2020-06-30	2019-06-30
Value	196000.0	196000.0	195000.0	0
Percentage of CommonStockValue	100.0	100.0	100.0	0.0
Percentage of Assets	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:CommonClassA	0.0	0.0	0.0	0.0

us-gaap:CommonClassB

Period End	2020-12-31	2020-09-30	2020-06-30	2019-06-30
Value	45000.0	45000.0	45000.0	0
Percentage of CommonStockValue	23.0	23.0	23.1	0.0
Percentage of Assets	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:CommonClassB	0.0	0.0	0.0	0.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

Period End	2020-12-31	2020-09-30	2020-06-30	2019-06-30
Value	2782	2757	2751	0.0
Percentage of AdditionalPaidInCapitalCommonStock	100.0	100.0	100.0	0.0
Percentage of Assets	67.5	76.9	74.0	0.0

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

Period End	2020-12-31	2020-09-30	2020-06-30	2019-06-30
Value	-72.768	52	141	0.0
Percentage of RetainedEarningsAccumulatedDeficit	100.0	100.0	100.0	0.0
Percentage of Assets	-1.8	1.5	3.8	0.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-06-30
Value	-25381000.0	-37554000.0	-51857000.0	-52607000.0	-33070000.0	-56602000.0	-46923000.0	-37187000.0	-43897000.0	-46918000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	-0.6	-1.0	-1.4	-1.4	0.0	0.0	-1.4	0.0	0.0	0.0

Minority Interest

us-gaap:MinorityInterest

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	11	11	12	17	13
Percentage of MinorityInterest	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.3	0.3	0.3	0.4	0.4

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

Period End	2020-12-31	2020-09-30
Value	24	11
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	100.0	100.0
Percentage of Assets	0.0	0.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2020-12-31	2020-09-30
Value	24	11
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	100.0	100.0
Percentage of Assets	0.0	0.0
Percentage of Assets us-gaap:AdditionalPaidInCapital	0.0	0.0

us-gaap:Parent

Period End	2020-12-31	2020-09-30
Value	24	11
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	100.0	100.0
Percentage of Assets	0.0	0.0
Percentage of Assets us-gaap:Parent	0.0	0.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	-51.791	-163.841	-40.92	33	122	-19.171	46
Percentage of NetCashProvidedByUsedInOperatingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-248.9	-1202.1	-454.7	18.2	31.2	-10.8	21.7

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	-47.648	194	88	-348.378	-62.996	-66.61	-71.212
Percentage of NetCashProvidedByUsedInInvestingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-229.0	1425.8	981.5	-191.5	-16.0	-37.4	-33.1

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	621	-7.021	-143.962	307	-5.599	-35.286	-41.199
Percentage of NetCashProvidedByUsedInFinancingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	2987.1	-51.5	-1599.8	169.2	-1.4	-19.8	-19.1

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	523	29	-97.544	-5.177	57	-123.017	-67.424
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	2518.6	214.8	-1083.9	-2.8	14.7	-69.1	-31.3

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	294000.0	182000.0	-679000.0	-10357000.0	402000.0	113000.0	-1165000.0
Percentage of DeferredIncomeTaxExpenseBenefit	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	23	26	24	26	27	26	27	26
Percentage of DepreciationDepletionAndAmortization	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DepreciationDepletionAndAmortization us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	3.066	3.522	3.895	2.854
Percentage of DepreciationDepletionAndAmortization	12.8	13.2	14.2	10.6

us-gaap:DepreciationDepletionAndAmortization us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, msge:MadisonSquareGardenEntertainment

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	19	22	21	21
Percentage of DepreciationDepletionAndAmortization	80.6	82.8	77.0	81.2

us-gaap:OperatingSegments, msge:TaoGroupHospitality

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	1.563	1.046	2.411	2.179
Percentage of DepreciationDepletionAndAmortization	6.5	3.9	8.8	8.1

Increase Decrease In Accounts Receivable

us-gaap:IncreaseDecreaseInAccountsReceivable

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	10	7.218	-46.805	22	-2.927	11	-70.091
Percentage of IncreaseDecreaseInAccountsReceivable	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	-51.791	-163.841	-40.92	33	122	-19.171	46
Percentage of NetCashProvidedByUsedInOperatingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-248.9	-1202.1	-454.7	18.2	31.2	-10.8	21.7

Net Income Loss

us-gaap:NetIncomeLoss

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	-124.859	-89.845	126	-128.586	78	-55.967	-59.289	-11.929	87	-31.345
Percentage of NetIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-600.2	-659.2	1407.1	-70.7	20.0	-31.4	-27.6	-5.0	21.1	-17.5

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

msge:MSGSportsCorpInvestment

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	-124.859	-89.845	-128.586	81	-55.967	-11.929
Percentage of NetIncomeLoss	100.0	100.0	100.0	103.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-600.2	-659.2	-70.7	20.6	-31.4	-5.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax msge:MSGSportsCorpInvestment	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:Parent

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	-124.859	-89.845	-128.586	81	-55.967	-11.929
Percentage of NetIncomeLoss	100.0	100.0	100.0	103.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-600.2	-659.2	-70.7	20.6	-31.4	-5.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parent	0.0	0.0	0.0	0.0	0.0	0.0

Profit Loss

us-gaap:ProfitLoss

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	-129.103	-94.364	120	-150.838	80	-56.563	-65.098	-12.616	83	-33.665
Percentage of ProfitLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-620.6	-692.3	1334.5	-82.9	20.4	-31.8	-30.3	-5.3	20.2	-18.8

Share Based Compensation

us-gaap:ShareBasedCompensation

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	23	11	12	8.836	10	10	7.472
Percentage of ShareBasedCompensation	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ShareBasedCompensation us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, msge:MadisonSquareGardenEntertainment

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	22	10	10	10
Percentage of ShareBasedCompensation	95.0	90.5	100.0	99.7

us-gaap:OperatingSegments, msge:TaoGroupHospitality

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	1.188	1.096	0.0	0.028
Percentage of ShareBasedCompensation	5.0	9.5	0.0	0.3

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	-47.648	194	88	-348.378	-62.996	-66.61	-71.212
Percentage of NetCashProvidedByUsedInInvestingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-229.0	1425.8	981.5	-191.5	-16.0	-37.4	-33.1

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	107	112	125	118	121	86	69
Percentage of PaymentsToAcquirePropertyPlantAndEquipment	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, msge:MadisonSquareGardenEntertainment

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	106	111	120	85
Percentage of PaymentsToAcquirePropertyPlantAndEquipment	99.7	99.4	99.1	98.6

us-gaap:OperatingSegments, msge:TaoGroupHospitality

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	0.293	0.659	1.139	1.203
Percentage of PaymentsToAcquirePropertyPlantAndEquipment	0.3	0.6	0.9	1.4

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	621	-7.021	-143.962	307	-5.599	-35.286	-41.199
Percentage of NetCashProvidedByUsedInFinancingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	2987.1	-51.5	-1599.8	169.2	-1.4	-19.8	-19.1

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

Period End	2020-09-30	2019-09-30
Value	1.25	2.5
Percentage of RepaymentsOfLongTermDebt	100.0	100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber msge:TypesOfVesting

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

msge:NonPerformanceVesting

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	94000.0	543000.0	543000.0	543000.0	543000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	100.0	100.0	100.0	100.0	100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	64.36	99.68	99.27	325.47	325.47
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	100.0	100.0	100.0	100.0	100.0

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod msge:TypesOfVesting, us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

msge:NonPerformanceVesting, us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31	2020-09-30
Value	48000.0	339000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	100.0	100.0

msge:PerformanceVesting, us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31	2020-09-30
Value	3000.0	325000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	6.2	95.9

msge:AdjustedOperatingIncomeLoss

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	-63.967	-67.653	108	-30.121
Percentage of AdjustedOperatingIncomeLoss	100.0	100.0	100.0	100.0

msge:AdjustedOperatingIncomeLoss us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	-0.263	-0.262	-0.075	-0.075
Percentage of AdjustedOperatingIncomeLoss	0.4	0.4	-0.1	0.2

msge:AdjustedOperatingIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, msge:MadisonSquareGardenEntertainment

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	-55.272	-58.277	98	-35.6
Percentage of AdjustedOperatingIncomeLoss	86.4	86.1	90.9	118.2

us-gaap:OperatingSegments, msge:TaoGroupHospitality

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	-8.432	-9.114	9.907	5.554
Percentage of AdjustedOperatingIncomeLoss	13.2	13.5	9.1	-18.4

msge:AmortizationOfPurchasePriceAccountingAdjustments

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	924000.0	924000.0	1068000.0	1120000.0
Percentage of AmortizationOfPurchasePriceAccountingAdjustments	100.0	100.0	100.0	100.0

msge:AmortizationOfPurchasePriceAccountingAdjustments us-gaap:ConsolidationItems

us-gaap:MaterialReconcilingItems

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	924000.0	924000.0	1068000.0	1120000.0
Percentage of AmortizationOfPurchasePriceAccountingAdjustments	100.0	100.0	100.0	100.0

msge:AmortizationofPurchasePriceAccountingAdjustmentsRentRelatedMatter

Period End	2020-09-30	2019-09-30
Value	924000.0	2276000.0
Percentage of AmortizationofPurchasePriceAccountingAdjustmentsRentRelatedMatter	100.0	100.0

msge:ComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToTheParentAndNonredeemableControllingInterest

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	-113.588	-76.172	-147.928	105	-65.606	-5.899
Percentage of ComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToTheParentAndNonredeemableControllingInterest	100.0	100.0	100.0	100.0	100.0	100.0

msge:ComprehensiveIncomeLossNetofTaxAttributabletoNonredeemableNoncontrollingInterests

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	-902000.0	-630000.0	195000.0	453000.0	40000.0	-680000.0
Percentage of ComprehensiveIncomeLossNetofTaxAttributabletoNonredeemableNoncontrollingInterests	100.0	100.0	100.0	100.0	100.0	100.0

msge:ComprehensiveIncomeLossNetofTaxAttributabletoRedeemableNoncontrollingInterests

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	-3342000.0	-3889000.0	-22447000.0	885000.0	-636000.0	-7000.0
Percentage of ComprehensiveIncomeLossNetofTaxAttributabletoRedeemableNoncontrollingInterests	100.0	100.0	100.0	100.0	100.0	100.0

msge:ComprehensiveIncomeLossNetofTaxAttributabletoRedeemableNoncontrollingInterests us-gaap:StatementEquityComponents

msge:LiabilitiesRedeemableNoncontrollingInterestsandEquity

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	-3342000.0	-3889000.0	-22447000.0	885000.0	-636000.0	-7000.0
Percentage of ComprehensiveIncomeLossNetofTaxAttributabletoRedeemableNoncontrollingInterests	100.0	100.0	100.0	100.0	100.0	100.0

msge:EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOfficerCompensationAmountofTaxExpense

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	799000.0	870000.0	1296000.0	1318000.0	1232000.0	1422000.0
Percentage of EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOfficerCompensationAmountofTaxExpense	100.0	100.0	100.0	100.0	100.0	100.0

msge:EffectiveIncomeTaxRateReconciliationReversalOfShareBasedCompensationCancellation

Period End	2020-12-31
Value	2337000.0
Percentage of EffectiveIncomeTaxRateReconciliationReversalOfShareBasedCompensationCancellation	100.0

msge:Increasedecreaseincollectionsduetopromoters

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30
Value	1.674	-8.498	22	-4.289	-2.108
Percentage of Increasedecreaseincollectionsduetopromoters	100.0	100.0	100.0	100.0	100.0

msge:Increasedecreaseinrightofuseassetsandliabilities

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	4007000.0	653000.0	4108000.0	-69000.0
Percentage of Increasedecreaseinrightofuseassetsandliabilities	100.0	100.0	100.0	100.0

msge:NonCashPortionOfArenaLicenseFees

Period End	2020-12-31
Value	-1176000.0
Percentage of NonCashPortionOfArenaLicenseFees	100.0

msge:NonCashPortionOfArenaLicenseFees us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, msge:MadisonSquareGardenEntertainment

Period End	2020-12-31
Value	-1176000.0
Percentage of NonCashPortionOfArenaLicenseFees	100.0

msge:NonServiceCostPeriodicPensionAndPostretirementBenefitCosts

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	178000.0	116000.0	-317000.0	-309000.0
Percentage of NonServiceCostPeriodicPensionAndPostretirementBenefitCosts	100.0	100.0	100.0	100.0

msge:OtherIncomeExpenseMiscellaneous

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	-313000.0	450000.0	0	2338000.0
Percentage of OtherIncomeExpenseMiscellaneous	100.0	100.0	0.0	100.0

msge:RelatedPartyServicesAgreement us-gaap:RelatedPartyTransactionsByRelatedParty

msge:RelatedPartyServicesAgreement

msge:MSGNetworks

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	2.374	2.374	2.641	2.641
Percentage of RelatedPartyServicesAgreement	100.0	100.0	100.0	100.0

msge:MadisonSquareGardenSports

Period End	2020-12-31	2020-09-30
Value	8.71	11
Percentage of RelatedPartyServicesAgreement	366.9	466.0

msge:RelatedPartyTransactionCorporateGeneralAndAdministrativeExpenseCredit us-gaap:RelatedPartyTransactionsByRelatedParty

msge:RelatedPartyTransactionCorporateGeneralAndAdministrativeExpenseCredit

msge:MSGNetworks

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	-2334000.0	-2543000.0	-2672000.0	-2602000.0	-2602000.0	-2514000.0
Percentage of RelatedPartyTransactionCorporateGeneralAndAdministrativeExpenseCredit	100.0	100.0	100.0	100.0	100.0	100.0

msge:MadisonSquareGardenSports

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	-8445000.0	-10180000.0	-32720000.0	-31093000.0
Percentage of RelatedPartyTransactionCorporateGeneralAndAdministrativeExpenseCredit	361.8	400.3	1257.5	1195.0

msge:RelatedPartyTransactionDirectOperatingExpensesFromTransactionsWithRelatedParty

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	0.015	0.081	13	23	16	31
Percentage of RelatedPartyTransactionDirectOperatingExpensesFromTransactionsWithRelatedParty	100.0	100.0	100.0	100.0	100.0	100.0

msge:RelatedPartyTransactionOtherExpensesCreditsFromTransactionsWithRelatedParty

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	693000.0	840000.0	174000.0	34000.0	89000.0	-49000.0
Percentage of RelatedPartyTransactionOtherExpensesCreditsFromTransactionsWithRelatedParty	100.0	100.0	100.0	100.0	100.0	100.0

msge:RelatedPartyTransactionSellingGeneralandAdministrativeExpensesNetofChargestofromTransactionswithRelatedParty

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	10	11	32	31	33	30
Percentage of RelatedPartyTransactionSellingGeneralandAdministrativeExpensesNetofChargestofromTransactionswithRelatedParty	100.0	100.0	100.0	100.0	100.0	100.0

msge:SharesOfInvestmentSold

Period End	2020-12-31
Value	395000.0
Percentage of SharesOfInvestmentSold	100.0

msge:StockBasedAwardsForfeiture us-gaap:SubsequentEventType

msge:StockBasedAwardsForfeiture

us-gaap:SubsequentEvent

Period End	2020-12-31
Value	11
Percentage of StockBasedAwardsForfeiture	100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

Period End	2020-12-31	2020-09-30
Value	5000.0	5970000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	100.0	100.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2020-12-31	2020-09-30
Value	5000.0	5971000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	100.0	100.0

us-gaap:CommonStock

Period End	2020-12-31	2020-09-30
Value	0	1000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	0.0	0.0

us-gaap:Parent

Period End	2020-12-31	2020-09-30
Value	5000.0	5970000.0
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	100.0	100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	0.587	76	2.852	29	6.559	39	14
Percentage of CapitalExpendituresIncurredButNotYetPaid	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid us-gaap:RelatedPartyTransactionsByRelatedParty

msge:Othernonconsolidatedaffiliate

Period End	2020-12-31	2020-09-30	2020-06-30
Value	9.151	12	2.121
Percentage of CapitalExpendituresIncurredButNotYetPaid	1558.9	16.8	74.4

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

Period End	2020-12-31	2020-09-30
Value	3009000.0	2060000.0
Percentage of ContractWithCustomerLiabilityRevenueRecognized	100.0	100.0

us-gaap:DebtAndEquitySecuritiesGainLoss

Period End	2020-12-31	2019-12-31
Value	-7.227	9.432
Percentage of DebtAndEquitySecuritiesGainLoss	100.0	100.0

us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	-7.227	33	40	-17.196	9.432	5.293	-1.091
Percentage of DebtAndEquitySecuritiesUnrealizedGainLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DebtInstrumentIncreaseDecreaseOtherNet dei:LegalEntity

us-gaap:DebtInstrumentIncreaseDecreaseOtherNet

msge:MSGNationalPropertiesLLC

Period End	2020-11-30
Value	650
Percentage of DebtInstrumentIncreaseDecreaseOtherNet	100.0

us-gaap:DebtInstrumentIncreaseDecreaseOtherNet dei:LegalEntity, us-gaap:SubsequentEventType

msge:MSGNationalPropertiesLLC, us-gaap:SubsequentEvent

Period End	2020-11-30
Value	650
Percentage of DebtInstrumentIncreaseDecreaseOtherNet	100.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	-20000.0	-20000.0	2000.0	-3000.0	-2000.0	-3000.0	25000.0	-10000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	-270000.0	-332000.0	-317000.0	-339000.0	-344000.0	-336000.0	-327000.0	-318000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses	1350.0	1660.0	-15850.0	11300.0	17200.0	11200.0	-1308.0	3180.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	1324000.0	1324000.0	1330000.0	1330000.0	1328000.0	1331000.0	789000.0	781000.0
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	10000.0	10000.0	25000.0	28000.0	27000.0	28000.0	-23000.0	58000.0
Percentage of DefinedBenefitPlanInterestCost	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	845000.0	845000.0	1279000.0	1326000.0	1328000.0	1328000.0	1476000.0	1473000.0
Percentage of DefinedBenefitPlanInterestCost	8450.0	8450.0	5116.0	4735.7	4918.5	4742.9	-6417.4	2539.7

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost dei:LegalEntity, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

msge:MadisonSquareGardenEntertainment, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	43000.0	43000.0	41000.0	38000.0	41000.0	78000.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost	100.0	100.0	100.0	100.0	100.0	100.0

msge:MadisonSquareGardenEntertainment, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	-187000.0	-127000.0	364000.0	312000.0	309000.0	859000.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost	-434.9	-295.3	887.8	821.1	753.7	1101.3

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	43000.0	43000.0	26000.0	49000.0	46000.0	49000.0	-1590000.0	95000.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost	100.0	100.0	0.0	119.5	121.1	119.5	0.0	121.8

us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	-187000.0	-127000.0	289000.0	426000.0	364000.0	361000.0	1097000.0	1030000.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost	-434.9	-295.3	0.0	1039.0	957.9	880.5	0.0	1320.5

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	13000.0	13000.0	3000.0	18000.0	17000.0	18000.0	-26000.0	28000.0
Percentage of DefinedBenefitPlanServiceCost	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	22000.0	20000.0	23000.0	24000.0	20000.0	28000.0	31000.0	20000.0
Percentage of DefinedBenefitPlanServiceCost	169.2	153.8	766.7	133.3	117.6	155.6	-119.2	71.4

us-gaap:DefinedContributionPlanIncreaseDecreaseCost us-gaap:RetirementPlanName

us-gaap:DefinedContributionPlanIncreaseDecreaseCost

msge:MSGSavingsPlans

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	1457000.0	1190000.0	-1307000.0	2435000.0	2160000.0	1854000.0
Percentage of DefinedContributionPlanIncreaseDecreaseCost	100.0	100.0	100.0	100.0	100.0	100.0

msge:MSGUnionPlan

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	10000.0	9000.0	469000.0	31000.0	22000.0	450000.0
Percentage of DefinedContributionPlanIncreaseDecreaseCost	0.7	0.8	-35.9	1.3	1.0	24.3

us-gaap:Depreciation

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	20	23	23	22	23	23
Percentage of Depreciation	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DirectOperatingCosts

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	35	34	35	132	210	131	163	158
Percentage of DirectOperatingCosts	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DirectOperatingCosts us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	0.151	-0.208	-0.274	-0.219
Percentage of DirectOperatingCosts	0.4	-0.6	-0.1	-0.2

us-gaap:MaterialReconcilingItems

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	0.924	0.924	1.068	1.114
Percentage of DirectOperatingCosts	2.6	2.7	0.5	0.8

us-gaap:DirectOperatingCosts us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, msge:MadisonSquareGardenEntertainment

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	23	23	168	94
Percentage of DirectOperatingCosts	66.0	69.1	80.0	72.2

us-gaap:OperatingSegments, msge:TaoGroupHospitality

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	10	9.828	41	35
Percentage of DirectOperatingCosts	31.0	28.8	19.6	27.1

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	1981000.0	5814000.0	-989000.0	2223000.0	3643000.0	-1950000.0	-1771000.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	1918000.0	866000.0	1261000.0	1308000.0	1232000.0	1250000.0	2020000.0	1926000.0
Percentage of EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncomeLossFromEquityMethodInvestments

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	-1.568	-1.696	-0.694	-1.096	-1.17	-1.473	-10.069	-2.881
Percentage of IncomeLossFromEquityMethodInvestments	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	-1.568	-1.696	-0.694	-1.096	-1.17	-1.473	-10.819
Percentage of IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	-35.819	-28.432	7.823	-30.968	27	-18.149	-19.242	-1.699
Percentage of IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncomeTaxReconciliationMinorityInterestIncomeExpense

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30	2019-03-31
Value	891000.0	949000.0	-11702000.0	4673000.0	-3995000.0	144000.0
Percentage of IncomeTaxReconciliationMinorityInterestIncomeExpense	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncomeTaxReconciliationStateAndLocalIncomeTaxes

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	12	-9.815	13	-14.084	-9.621	-5.298	-6.474	-0.431
Percentage of IncomeTaxReconciliationStateAndLocalIncomeTaxes	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncreaseDecreaseInAccountsPayableTrade

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	-2.782	-9.524	-9.643	-14.597	16	1.593	0.278
Percentage of IncreaseDecreaseInAccountsPayableTrade	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	12	-40.323	5.264	26	24	-5.092	5.149
Percentage of IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncreaseDecreaseInDeferredLiabilities

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30
Value	2.836	11	37	-43.431	40
Percentage of IncreaseDecreaseInDeferredLiabilities	100.0	100.0	100.0	100.0	100.0

us-gaap:IncreaseDecreaseInDueFromAffiliatesCurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	-11.457	21	19	9.882	-24.096	14	0.278
Percentage of IncreaseDecreaseInDueFromAffiliatesCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	-0.273	2.537	-10.415	9.014	15	7.482	-27.612
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:InterestPaid dei:LegalEntity, us-gaap:DebtInstrument

us-gaap:InterestPaid

msge:TaoGroupHospitality, msge:TAO2019SeniorCreditAgreement

Period End	2020-12-31	2020-09-30
Value	0.22	0.334
Percentage of InterestPaid	100.0	100.0

us-gaap:InvestmentIncomeInterest

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	0.349	0.295	0.751	3.659	6.268	7.315	8.143	7.987
Percentage of InvestmentIncomeInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:LeaseCost

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30
Value	11	11	14	18	14
Percentage of LeaseCost	100.0	100.0	100.0	100.0	100.0

us-gaap:NetIncomeLossAttributableToNonredeemableNoncontrollingInterest

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	-902000.0	-630000.0	-1572000.0	195000.0	453000.0	40000.0	-1824000.0	-680000.0
Percentage of NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:NetIncomeLossAttributableToNonredeemableNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30
Value	-902000.0	-630000.0	195000.0	453000.0	40000.0
Percentage of NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	100.0	100.0	100.0	100.0	100.0

us-gaap:NetIncomeLossAttributableToRedeemableNoncontrollingInterest

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	-3342000.0	-3889000.0	-6536000.0	-22447000.0	885000.0	-636000.0	-3637000.0	-7000.0
Percentage of NetIncomeLossAttributableToRedeemableNoncontrollingInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:NetIncomeLossAttributableToRedeemableNoncontrollingInterest us-gaap:StatementEquityComponents

msge:LiabilitiesRedeemableNoncontrollingInterestsandEquity

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30
Value	-3342000.0	-3889000.0	-22447000.0	885000.0	-636000.0
Percentage of NetIncomeLossAttributableToRedeemableNoncontrollingInterest	100.0	100.0	100.0	100.0	100.0

us-gaap:NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	-125.761	-90.475	120	-128.391	81	-55.927	-62.696	-12.609
Percentage of NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	300000.0	200000.0	300000.0	0	2000000.0	1709000.0	46000.0	3156000.0
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	300000.0	200000.0	300000.0	0	2000000.0	1709000.0	46000.0	3156000.0
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0

us-gaap:OperatingLeaseCost us-gaap:IncomeStatementLocation

us-gaap:OperatingLeaseCost

msge:DirectOperatingExpenses

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30
Value	6.545	6.407	8.09	11	8.241
Percentage of OperatingLeaseCost	100.0	100.0	100.0	100.0	100.0

us-gaap:SellingGeneralAndAdministrativeExpenses

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	5.029	5.095	4.459	5.348	5.102	4.815
Percentage of OperatingLeaseCost	76.8	79.5	0.0	66.1	45.0	58.4

us-gaap:OperatingLeaseLeaseIncome us-gaap:PropertySubjectToOrAvailableForOperatingLease

us-gaap:OperatingLeaseLeaseIncome

msge:TheGarden

Period End	2020-12-31
Value	1585000.0
Percentage of OperatingLeaseLeaseIncome	100.0

us-gaap:OperatingLeasePayments

Period End	2020-12-31	2020-09-30
Value	12	12
Percentage of OperatingLeasePayments	100.0	100.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	11	13	-0.914	-19.946	23	-10.018	-7.522	6.383
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	11	13	-19.946	23	-10.018	6.383
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossBeforeTax

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	12	14	23	-9.679
Percentage of OtherComprehensiveIncomeLossBeforeTax	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax

Period End	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31
Value	-352000.0	-270000.0	-409000.0	-339000.0	2214000.0	-327000.0
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	-290000.0	-352000.0	2488000.0	-409000.0	-346000.0	-339000.0	-327000.0
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	290000.0	352000.0	409000.0	346000.0	339000.0	327000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	-290000.0	-352000.0	-342000.0	-346000.0	-339000.0	-328000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherNoncashIncomeExpense

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30
Value	-1598000.0	244000.0	2195000.0	-543000.0	-164000.0
Percentage of OtherNoncashIncomeExpense	100.0	100.0	100.0	100.0	100.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	103000.0	-60000.0	63000.0	-476000.0
Percentage of PaymentsForProceedsFromOtherInvestingActivities	100.0	100.0	100.0	100.0

us-gaap:PaymentsForRestructuring

Period End	2020-12-31	2020-09-30
Value	4.304	15
Percentage of PaymentsForRestructuring	100.0	100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

Period End	2020-12-31	2020-09-30
Value	4000.0	5971000.0
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation	100.0	100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation us-gaap:AwardType

us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31	2020-09-30
Value	5000.0	5971000.0
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation	125.0	100.0

us-gaap:ProceedsFromCollectionOfNotesReceivable

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	0.0	6.328	0.0	0.75
Percentage of ProceedsFromCollectionOfNotesReceivable	0.0	100.0	0.0	100.0

us-gaap:ProceedsFromMinorityShareholders

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	300000.0	200000.0	300000.0	2000000.0	0	2000000.0	750000.0
Percentage of ProceedsFromMinorityShareholders	100.0	100.0	100.0	100.0	0.0	100.0	100.0

us-gaap:ProceedsFromSaleAndMaturityOfMarketableSecurities

Period End	2020-12-31
Value	20
Percentage of ProceedsFromSaleAndMaturityOfMarketableSecurities	100.0

us-gaap:ProceedsFromSaleAndMaturityOfOtherInvestments

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30
Value	39	300	70	0.0	106
Percentage of ProceedsFromSaleAndMaturityOfOtherInvestments	100.0	100.0	100.0	0.0	100.0

us-gaap:PropertyPlantAndEquipmentAdditions us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:PropertyPlantAndEquipmentAdditions

msge:Othernonconsolidatedaffiliate

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	13	11	4.171	3.199
Percentage of PropertyPlantAndEquipmentAdditions	100.0	100.0	100.0	100.0

us-gaap:ProvisionForDoubtfulAccounts

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	78000.0	692000.0	2991000.0	2504000.0	3390000.0	1060000.0	691000.0
Percentage of ProvisionForDoubtfulAccounts	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30	2019-03-31
Value	-290000.0	-352000.0	-409000.0	-346000.0	-339000.0	-327000.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RelatedPartyCosts us-gaap:RelatedPartyTransaction, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:RelatedPartyCosts

msge:RevenueSharingExpense, msge:MadisonSquareGardenSports

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	0.015	0.081	47	18
Percentage of RelatedPartyCosts	100.0	100.0	100.0	100.0

us-gaap:RestructuringAndRelatedCostIncurredCost

Period End	2020-09-30
Value	19
Percentage of RestructuringAndRelatedCostIncurredCost	100.0

us-gaap:RestructuringAndRelatedCostNumberOfPositionsEliminated

Period End	2020-11-30	2020-08-31	2020-09-30	2020-05-31
Value	10.0	350.0	350.0	6000.0
Percentage of RestructuringAndRelatedCostNumberOfPositionsEliminated	100.0	100.0	100.0	100.0

us-gaap:RestructuringAndRelatedCostNumberOfPositionsEliminated msge:TypeOfEmployees

msge:CorporateEmployee

Period End	2020-08-04
Value	350.0
Percentage of RestructuringAndRelatedCostNumberOfPositionsEliminated	0.0

us-gaap:RestructuringAndRelatedCostNumberOfPositionsEliminated us-gaap:StatementScenario, us-gaap:SubsequentEventType

srt:ScenarioForecast, us-gaap:SubsequentEvent

Period End	2020-08-31
Value	350.0
Percentage of RestructuringAndRelatedCostNumberOfPositionsEliminated	100.0

us-gaap:RestructuringCharges

Period End	2020-12-31	2020-09-30
Value	1.372	19
Percentage of RestructuringCharges	100.0	100.0

us-gaap:RestructuringCharges us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, msge:MadisonSquareGardenEntertainment

Period End	2020-12-31	2020-09-30
Value	1.372	19
Percentage of RestructuringCharges	100.0	100.0

us-gaap:RevenueFromRelatedParties

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	5.262	4.018	4.616	6.333	0.984	6.475	2.497	7.906
Percentage of RevenueFromRelatedParties	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RevenueNotFromContractWithCustomerOther

Period End	2020-12-31
Value	2333000.0
Percentage of RevenueNotFromContractWithCustomerOther	100.0

us-gaap:SeveranceCosts1

Period End	2020-12-31
Value	1.372
Percentage of SeveranceCosts1	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost

Period End	2020-12-31
Value	11
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod msge:TypesOfVesting, us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod

msge:NonPerformanceVesting, us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31	2020-09-30
Value	19000.0	7000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	100.0	100.0

msge:PerformanceVesting, us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31	2020-09-30
Value	20000.0	9000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	105.3	128.6

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod us-gaap:SubsequentEventType

us-gaap:SubsequentEvent

Period End	2020-10-08
Value	32471.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	0.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue

us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31	2020-09-30
Value	-2.63	75.26
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31	2020-09-30
Value	2.53	69.07
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod msge:TypesOfVesting, us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod

msge:NonPerformanceVesting, us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31	2020-09-30
Value	21000.0	113000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	100.0	100.0

msge:PerformanceVesting, us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31	2020-09-30
Value	0	85000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	0.0	75.2

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue

us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31	2020-09-30
Value	1.663	14
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31	2020-09-30
Value	1.0	68.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod us-gaap:SubsequentEventType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod

us-gaap:SubsequentEvent

Period End	2020-10-08
Value	448990.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	100.0

us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation us-gaap:AwardType

us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation

us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31	2020-09-30
Value	0	81000.0
Percentage of SharesPaidForTaxWithholdingForShareBasedCompensation	0.0	100.0

us-gaap:SubleaseIncome us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:SubleaseIncome

msge:OtherRelatedParties

Period End	2020-12-31	2020-09-30
Value	611000.0	618000.0
Percentage of SubleaseIncome	100.0	100.0

us-gaap:UnrealizedGainOnSecurities

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30
Value	4.568	33	9.432	5.293
Percentage of UnrealizedGainOnSecurities	100.0	100.0	100.0	100.0

us-gaap:VariableLeaseCost us-gaap:IncomeStatementLocation

us-gaap:VariableLeaseCost

msge:DirectOperatingExpenses

Period End	2020-12-31	2020-09-30	2020-03-31	2019-12-31	2019-09-30
Value	271000.0	276000.0	830000.0	1696000.0	1534000.0
Percentage of VariableLeaseCost	100.0	100.0	100.0	100.0	100.0

us-gaap:SellingGeneralAndAdministrativeExpenses

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	15000.0	23000.0	21000.0	14000.0	14000.0	13000.0
Percentage of VariableLeaseCost	5.5	8.3	0.0	1.7	0.8	0.8

dei:EntityCommonStockSharesOutstanding us-gaap:StatementClassOfStock

dei:EntityCommonStockSharesOutstanding

us-gaap:CommonClassA

Period End	2020-07-31	2020-04-30
Value	19	19
Percentage of EntityCommonStockSharesOutstanding	100.0	100.0

msge:CarryingValueOfFinancialInstrumentAssets us-gaap:FinancialInstrument

msge:CarryingValueOfFinancialInstrumentAssets

msge:EquitySecuritiesWithReadilyDeterminableFairValues

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	63	90	57	14	17
Percentage of CarryingValueOfFinancialInstrumentAssets	100.0	100.0	100.0	100.0	100.0

us-gaap:ShortTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	38	337	331	108
Percentage of CarryingValueOfFinancialInstrumentAssets	42.9	590.9	2238.1	628.1

msge:CarryingValueOfFinancialInstrumentLiabilities us-gaap:DebtInstrument, us-gaap:FinancialInstrument

msge:CarryingValueOfFinancialInstrumentLiabilities

msge:NationalPropertiesNov2020SeniorSecuredTermLoanAgreement, us-gaap:Debt

Period End	2020-12-31
Value	650
Percentage of CarryingValueOfFinancialInstrumentLiabilities	100.0

msge:TAO2019SeniorCreditAgreement, us-gaap:Debt

Period End	2020-12-31	2020-06-30
Value	37	33
Percentage of CarryingValueOfFinancialInstrumentLiabilities	5.8	0.0

msge:CarryingValueOfFinancialInstrumentLiabilities us-gaap:FinancialInstrument

us-gaap:Debt

Period End	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	32	33	35	55
Percentage of CarryingValueOfFinancialInstrumentLiabilities	0.0	0.0	0.0	0.0

msge:DebtOutstandingNetOfUnamortizedDebtIssuanceCostAndUnamortizedOriginalIssueDiscount dei:LegalEntity, us-gaap:BalanceSheetLocation, us-gaap:LongtermDebtType

msge:DebtOutstandingNetOfUnamortizedDebtIssuanceCostAndUnamortizedOriginalIssueDiscount

msge:MSGNationalPropertiesLLC, msge:CurrentPortionOfLongTermDebtNetOfDeferredFinancingCosts, us-gaap:SecuredDebt

Period End	2020-12-31
Value	-0.283
Percentage of DebtOutstandingNetOfUnamortizedDebtIssuanceCostAndUnamortizedOriginalIssueDiscount	100.0

msge:MSGNationalPropertiesLLC, msge:LongTermDebtNetOfDeferredFinancingCosts, us-gaap:SecuredDebt

Period End	2020-12-31
Value	617
Percentage of DebtOutstandingNetOfUnamortizedDebtIssuanceCostAndUnamortizedOriginalIssueDiscount	-218123.7

msge:TaoGroupHospitality, msge:CurrentPortionOfLongTermDebtNetOfDeferredFinancingCosts, us-gaap:SecuredDebt

Period End	2020-12-31	2020-06-30
Value	4.761	4.792
Percentage of DebtOutstandingNetOfUnamortizedDebtIssuanceCostAndUnamortizedOriginalIssueDiscount	-1682.3	0.0

msge:TaoGroupHospitality, msge:LongTermDebtNetOfDeferredFinancingCosts, us-gaap:RevolvingCreditFacility

Period End	2020-12-31
Value	6.5
Percentage of DebtOutstandingNetOfUnamortizedDebtIssuanceCostAndUnamortizedOriginalIssueDiscount	-2296.8

msge:TaoGroupHospitality, msge:LongTermDebtNetOfDeferredFinancingCosts, us-gaap:SecuredDebt

Period End	2020-12-31	2020-06-30
Value	25	28
Percentage of DebtOutstandingNetOfUnamortizedDebtIssuanceCostAndUnamortizedOriginalIssueDiscount	-9065.4	0.0

msge:DebtOutstandingNetOfUnamortizedDebtIssuanceCostAndUnamortizedOriginalIssueDiscount us-gaap:BalanceSheetLocation, us-gaap:LongtermDebtType

msge:CurrentPortionOfLongTermDebtNetOfDeferredFinancingCosts, us-gaap:SecuredDebt

Period End	2020-12-31	2020-06-30
Value	4.478	4.792
Percentage of DebtOutstandingNetOfUnamortizedDebtIssuanceCostAndUnamortizedOriginalIssueDiscount	-1582.3	0.0

msge:LongTermDebtNetOfDeferredFinancingCosts, us-gaap:SecuredDebt

Period End	2020-12-31	2020-06-30
Value	649	28
Percentage of DebtOutstandingNetOfUnamortizedDebtIssuanceCostAndUnamortizedOriginalIssueDiscount	-229485.9	0.0

msge:DueToThirdPartyPromoters

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	19	12	31	49	67
Percentage of DueToThirdPartyPromoters	100.0	100.0	100.0	100.0	100.0

msge:DueToThirdPartyPromotersNonCurrent

Period End	2020-12-31	2020-09-30
Value	5.179	10
Percentage of DueToThirdPartyPromotersNonCurrent	100.0	100.0

msge:FairValueOfFinancialInstrumentAssets us-gaap:FinancialInstrument

msge:FairValueOfFinancialInstrumentAssets

msge:EquitySecuritiesWithReadilyDeterminableFairValues

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	63	90	57	14	17
Percentage of FairValueOfFinancialInstrumentAssets	100.0	100.0	100.0	100.0	100.0

us-gaap:ShortTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	38	337	331	108
Percentage of FairValueOfFinancialInstrumentAssets	42.9	590.9	2238.1	628.1

msge:FairValueOfFinancialInstrumentLiabilities us-gaap:DebtInstrument, us-gaap:FinancialInstrument

msge:FairValueOfFinancialInstrumentLiabilities

msge:NationalPropertiesNov2020SeniorSecuredTermLoanAgreement, us-gaap:Debt

Period End	2020-12-31
Value	657
Percentage of FairValueOfFinancialInstrumentLiabilities	100.0

msge:TAO2019SeniorCreditAgreement, us-gaap:Debt

Period End	2020-12-31	2020-06-30
Value	37	32
Percentage of FairValueOfFinancialInstrumentLiabilities	5.7	0.0

msge:FairValueOfFinancialInstrumentLiabilities us-gaap:FinancialInstrument

us-gaap:Debt

Period End	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	31	32	31	54
Percentage of FairValueOfFinancialInstrumentLiabilities	0.0	0.0	0.0	0.0

msge:GuaranteeAndReserveAccountAgreementInitialDeposit dei:LegalEntity, us-gaap:DebtInstrument

msge:GuaranteeAndReserveAccountAgreementInitialDeposit

msge:TaoGroupHospitality, msge:TAO2019SeniorCreditAgreement

Period End	2020-12-31	2020-08-06
Value	8100000.0	9800000.0
Percentage of GuaranteeAndReserveAccountAgreementInitialDeposit	100.0	100.0

msge:GuaranteeAndReserveAccountAgreementMinimumLiquidityRequirement dei:LegalEntity, us-gaap:DebtInstrument

msge:GuaranteeAndReserveAccountAgreementMinimumLiquidityRequirement

msge:TaoGroupHospitality, msge:TAO2019SeniorCreditAgreement

Period End	2020-08-06
Value	75
Percentage of GuaranteeAndReserveAccountAgreementMinimumLiquidityRequirement	100.0

msge:LiquidityRequirement dei:LegalEntity, us-gaap:DebtInstrument

msge:LiquidityRequirement

msge:TaoGroupHospitality, msge:TAO2019SeniorCreditAgreement

Period End	2020-08-06
Value	75
Percentage of LiquidityRequirement	100.0

msge:LiquidityRequirement dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

msge:MSGNationalPropertiesLLC, msge:NationalPropertiesNov2020SeniorSecuredTermLoanAgreement, us-gaap:LoansPayable

Period End	2020-11-12
Value	450
Percentage of LiquidityRequirement	0.0

msge:LiquidityRequirement dei:LegalEntity, us-gaap:Range, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

msge:MSGNationalPropertiesLLC, srt:Minimum, msge:NationalPropertiesNov2020SeniorSecuredTermLoanAgreement, us-gaap:LoansPayable

Period End	2020-11-12
Value	200
Percentage of LiquidityRequirement	0.0

msge:LiquidityRequirement dei:LegalEntity, us-gaap:Range, us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

msge:MSGNationalPropertiesLLC, srt:Minimum, us-gaap:ScenarioAdjustment, msge:NationalPropertiesNov2020SeniorSecuredTermLoanAgreement, us-gaap:LoansPayable

Period End	2020-12-31
Value	50
Percentage of LiquidityRequirement	0.0

msge:LiquidityRequirementAfterFirstYear dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

msge:LiquidityRequirementAfterFirstYear

msge:MSGNationalPropertiesLLC, msge:NationalPropertiesNov2020SeniorSecuredTermLoanAgreement, us-gaap:LoansPayable

Period End	2020-11-12
Value	200
Percentage of LiquidityRequirementAfterFirstYear	100.0

msge:OtherEmployeeRelatedLiabilitiesNoncurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	13	14	15	17	15
Percentage of OtherEmployeeRelatedLiabilitiesNoncurrent	100.0	100.0	100.0	100.0	100.0

msge:PercentageOfCommonStockOwnedByRelatedParty us-gaap:StatementClassOfStock

msge:PercentageOfCommonStockOwnedByRelatedParty

us-gaap:CommonClassA

Period End	2020-12-31	2020-09-30	2020-03-31
Value	3.1	3.1	0.035
Percentage of PercentageOfCommonStockOwnedByRelatedParty	100.0	100.0	100.0

us-gaap:AccountsReceivableRelatedPartiesCurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	31	45	23	2.288	1.722
Percentage of AccountsReceivableRelatedPartiesCurrent	100.0	100.0	100.0	100.0	100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-06-30
Value	-38680000.0	-38970000.0	-39322000.0	-40986000.0	-41395000.0	-41741000.0	-42080000.0	-39866000.0	-40193000.0	-40846000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-06-30
Value	13	1.416	-12.535	-11.621	8.325	-14.861	-4.843	2.679	-3.704	-0.502
Percentage of AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AllowanceForDoubtfulAccountsReceivable

Period End	2020-12-31	2020-06-30
Value	9222000.0	9135000.0
Percentage of AllowanceForDoubtfulAccountsReceivable	100.0	100.0

us-gaap:AssetsFairValueDisclosure

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	1057	966	1057	1082	1078
Percentage of AssetsFairValueDisclosure	100.0	100.0	100.0	100.0	100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel

msge:EquitySecuritiesWithReadilyDeterminableFairValues, us-gaap:FairValueInputsLevel1

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	63	90	57	14	17
Percentage of AssetsFairValueDisclosure	6.0	9.3	5.4	1.4	1.6

us-gaap:BankTimeDeposits, us-gaap:FairValueInputsLevel1

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	481	340	0.777	67	789
Percentage of AssetsFairValueDisclosure	45.5	35.3	0.1	6.3	73.2

us-gaap:MoneyMarketFunds, us-gaap:FairValueInputsLevel1

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	198	225	0.0	0.0	101
Percentage of AssetsFairValueDisclosure	18.7	23.3	0.0	0.0	9.4

us-gaap:USTreasuryBillSecurities, us-gaap:FairValueInputsLevel1

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	314	309	999	999	0.0
Percentage of AssetsFairValueDisclosure	29.8	32.1	94.5	92.4	0.0

us-gaap:ContractWithCustomerAssetNet us-gaap:BalanceSheetLocation

us-gaap:ContractWithCustomerAssetNet

msge:AccountsReceivableandRelatedPartyReceivables

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	75	66	59	105	81
Percentage of ContractWithCustomerAssetNet	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherCurrentAssets

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	8.718	2.651	3.85	8.164	6.873
Percentage of ContractWithCustomerAssetNet	11.6	4.0	6.4	7.8	8.5

us-gaap:ContractWithCustomerAssetNet us-gaap:BalanceSheetLocation, us-gaap:RelatedPartyTransactionsByRelatedParty

msge:Netrelatedpartyreceivables, srt:AffiliatedEntity

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	1.656	2.716	2.644	0.01	0.126
Percentage of ContractWithCustomerAssetNet	2.2	4.1	4.4	0.0	0.2

us-gaap:ContractWithCustomerLiability us-gaap:BalanceSheetLocation

us-gaap:ContractWithCustomerLiability

msge:DeferredRevenueandOtherLiabilities

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	207	204	193	212	197
Percentage of ContractWithCustomerLiability	100.0	100.0	100.0	100.0	100.0

us-gaap:DebtInstrumentCarryingAmount dei:LegalEntity, us-gaap:BalanceSheetLocation, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentCarryingAmount

msge:MSGNationalPropertiesLLC, msge:CurrentPortionOfLongTermDebtNetOfDeferredFinancingCosts, us-gaap:SecuredDebt

Period End	2020-12-31
Value	6.5
Percentage of DebtInstrumentCarryingAmount	100.0

msge:MSGNationalPropertiesLLC, msge:LongTermDebtNetOfDeferredFinancingCosts, us-gaap:SecuredDebt

Period End	2020-12-31
Value	643
Percentage of DebtInstrumentCarryingAmount	9900.0

msge:TaoGroupHospitality, msge:LongTermDebtNetOfDeferredFinancingCosts, us-gaap:RevolvingCreditFacility

Period End	2020-12-31
Value	6.5
Percentage of DebtInstrumentCarryingAmount	100.0

msge:TaoGroupHospitality, msge:LongTermDebtNetOfDeferredFinancingCosts, us-gaap:SecuredDebt

Period End	2020-12-31	2020-06-30
Value	26	28
Percentage of DebtInstrumentCarryingAmount	403.8	0.0

msge:TaoGroupHospitality, us-gaap:Liability, us-gaap:SecuredDebt

Period End	2020-09-30	2020-06-30
Value	32	33
Percentage of DebtInstrumentCarryingAmount	0.0	0.0

msge:TaoGroupHospitality, us-gaap:OtherNoncurrentLiabilities, us-gaap:SecuredDebt

Period End	2020-09-30	2020-06-30
Value	27	28
Percentage of DebtInstrumentCarryingAmount	0.0	0.0

us-gaap:DebtInstrumentCarryingAmount dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

msge:MSGNationalPropertiesLLC, msge:NationalPropertiesNov2020SeniorSecuredTermLoanAgreement, us-gaap:LoansPayable

Period End	2020-12-31
Value	650
Percentage of DebtInstrumentCarryingAmount	10000.0

msge:TaoGroupHospitality, msge:TAO2019SeniorCreditAgreement, us-gaap:LoansPayable

Period End	2020-08-06
Value	33
Percentage of DebtInstrumentCarryingAmount	0.0

us-gaap:DebtInstrumentCarryingAmount dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

msg:Tao, msg:TAO2019SeniorCreditAgreement, us-gaap:LoansPayable, us-gaap:SubsequentEvent

Period End	2020-08-06
Value	33
Percentage of DebtInstrumentCarryingAmount	0.0

us-gaap:DebtInstrumentCarryingAmount dei:LegalEntity, us-gaap:SubsequentEventType

msge:MSGNationalPropertiesLLC, us-gaap:SubsequentEvent

Period End	2020-11-12
Value	650
Percentage of DebtInstrumentCarryingAmount	0.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:BalanceSheetLocation, us-gaap:LongtermDebtType

msge:CurrentPortionOfLongTermDebtNetOfDeferredFinancingCosts, us-gaap:SecuredDebt

Period End	2020-12-31	2020-06-30
Value	11	5.0
Percentage of DebtInstrumentCarryingAmount	176.9	0.0

msge:LongTermDebtNetOfDeferredFinancingCosts, us-gaap:SecuredDebt

Period End	2020-12-31	2020-06-30
Value	676	28
Percentage of DebtInstrumentCarryingAmount	10403.8	0.0

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

us-gaap:DebtInstrumentFaceAmount

msge:MSGNationalPropertiesLLC, msge:NationalPropertiesNov2020SeniorSecuredTermLoanAgreement, us-gaap:LoansPayable

Period End	2020-11-12
Value	650
Percentage of DebtInstrumentFaceAmount	100.0

us-gaap:DebtInstrumentMeasurementInput us-gaap:Range, us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:MeasurementInputType

us-gaap:DebtInstrumentMeasurementInput

srt:Maximum, srt:ScenarioForecast, msg:TAO2019SeniorCreditAgreement, msg:MeasurementInputFixedChargeCoverageRatio

Period End	2021-12-31
Value	2.5
Percentage of DebtInstrumentMeasurementInput	100.0

srt:Maximum, srt:ScenarioForecast, msg:TAO2019SeniorCreditAgreement, msg:MeasurementInputLeverageRatio

Period End	2021-12-31
Value	3.5
Percentage of DebtInstrumentMeasurementInput	140.0

srt:Maximum, srt:ScenarioForecast, msge:TAO2019SeniorCreditAgreement, msge:MeasurementInputLeverageRatio

Period End	2021-12-31
Value	3.5
Percentage of DebtInstrumentMeasurementInput	140.0

srt:Maximum, srt:ScenarioForecast, msge:TAO2019SeniorCreditAgreement, msge:MeasurementInputSeniorLeverageRatio

Period End	2021-12-31
Value	2.5
Percentage of DebtInstrumentMeasurementInput	100.0

us-gaap:DebtInstrumentUnamortizedDiscount dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentUnamortizedDiscount

msge:MSGNationalPropertiesLLC, msge:NationalPropertiesNov2020SeniorSecuredTermLoanAgreement, us-gaap:LoansPayable

Period End	2020-11-12
Value	19
Percentage of DebtInstrumentUnamortizedDiscount	100.0

us-gaap:DeferredFinanceCostsGross dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DeferredFinanceCostsGross

msge:MSGNationalPropertiesLLC, msge:NationalPropertiesNov2020SeniorSecuredTermLoanAgreement, us-gaap:LoansPayable

Period End	2020-11-12
Value	14
Percentage of DeferredFinanceCostsGross	100.0

us-gaap:DeferredFinanceCostsNet dei:LegalEntity, us-gaap:BalanceSheetLocation, us-gaap:LongtermDebtType

us-gaap:DeferredFinanceCostsNet

msge:MSGNationalPropertiesLLC, msge:CurrentPortionOfLongTermDebtNetOfDeferredFinancingCosts, us-gaap:SecuredDebt

Period End	2020-12-31
Value	6.783
Percentage of DeferredFinanceCostsNet	100.0

msge:MSGNationalPropertiesLLC, msge:LongTermDebtNetOfDeferredFinancingCosts, us-gaap:SecuredDebt

Period End	2020-12-31
Value	26
Percentage of DeferredFinanceCostsNet	386.4

msge:TaoGroupHospitality, msge:CurrentPortionOfLongTermDebtNetOfDeferredFinancingCosts, us-gaap:SecuredDebt

Period End	2020-12-31	2020-06-30
Value	0.239	0.208
Percentage of DeferredFinanceCostsNet	3.5	0.0

msge:TaoGroupHospitality, msge:LongTermDebtNetOfDeferredFinancingCosts, us-gaap:SecuredDebt

Period End	2020-12-31	2020-06-30
Value	0.595	0.624
Percentage of DeferredFinanceCostsNet	8.8	0.0

msge:TaoGroupHospitality, us-gaap:Liability, us-gaap:SecuredDebt

Period End	2020-09-30	2020-06-30
Value	0.894	0.832
Percentage of DeferredFinanceCostsNet	0.0	0.0

msge:TaoGroupHospitality, us-gaap:OtherCurrentLiabilities, us-gaap:SecuredDebt

Period End	2020-09-30	2020-06-30
Value	0.239	0.208
Percentage of DeferredFinanceCostsNet	0.0	0.0

msge:TaoGroupHospitality, us-gaap:OtherNoncurrentLiabilities, us-gaap:SecuredDebt

Period End	2020-09-30	2020-06-30
Value	0.655	0.624
Percentage of DeferredFinanceCostsNet	0.0	0.0

us-gaap:DeferredFinanceCostsNet us-gaap:BalanceSheetLocation, us-gaap:LongtermDebtType

msge:CurrentPortionOfLongTermDebtNetOfDeferredFinancingCosts, us-gaap:SecuredDebt

Period End	2020-12-31	2020-06-30
Value	7.022	0.208
Percentage of DeferredFinanceCostsNet	103.5	0.0

msge:LongTermDebtNetOfDeferredFinancingCosts, us-gaap:SecuredDebt

Period End	2020-12-31	2020-06-30
Value	26	0.624
Percentage of DeferredFinanceCostsNet	395.2	0.0

us-gaap:DueToRelatedPartiesCurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	16	18	18	31	18
Percentage of DueToRelatedPartiesCurrent	100.0	100.0	100.0	100.0	100.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	50	44	68	70	82
Percentage of EmployeeRelatedLiabilitiesCurrent	100.0	100.0	100.0	100.0	100.0

us-gaap:EquitySecuritiesFvNiCost

Period End	2020-12-31	2020-09-30	2020-06-30	2019-06-30
Value	29	32	32	23
Percentage of EquitySecuritiesFvNiCost	100.0	100.0	100.0	100.0

us-gaap:EquitySecuritiesFvNiCost us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument

msge:Draftkings, us-gaap:CommonStock

Period End	2020-12-31	2020-09-30	2020-06-30
Value	6.209	8.798	8.798
Percentage of EquitySecuritiesFvNiCost	21.1	27.5	27.5

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	53	50	47	41	41
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization	100.0	100.0	100.0	100.0	100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:FiniteLivedIntangibleAssetsByMajorClass

msge:FestivalRights

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	2.426	2.291	2.156	2.02	1.617
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization	4.6	4.6	4.5	4.8	3.9

msge:VenueManagementContracts

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	17	16	15	13	9.887
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization	33.6	33.3	32.9	31.8	24.0

us-gaap:NoncompeteAgreements

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	6.131	5.74	5.348	4.565	3.391
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization	11.5	11.4	11.3	10.9	8.2

us-gaap:OtherIntangibleAssets

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	3.674	3.604	3.533	3.462	4.566
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization	6.9	7.2	7.5	8.3	11.1

us-gaap:TradeNames

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	23	21	20	18	11
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization	43.4	43.6	43.8	44.2	27.5

us-gaap:FiniteLivedIntangibleAssetsGross

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	197	197	197	197	255
Percentage of FiniteLivedIntangibleAssetsGross	100.0	100.0	100.0	100.0	100.0

us-gaap:FiniteLivedIntangibleAssetsGross us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:OtherIntangibleAssets

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	4.217	4.217	4.217	4.217	6.717
Percentage of FiniteLivedIntangibleAssetsGross	2.1	2.1	2.1	2.1	2.6

us-gaap:TradeNames

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	97	97	97	97	98
Percentage of FiniteLivedIntangibleAssetsGross	49.3	49.3	49.3	49.3	38.6

us-gaap:InvestmentOwnedBalanceShares us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument

us-gaap:InvestmentOwnedBalanceShares

msge:Draftkings, us-gaap:CommonStock

Period End	2020-12-31	2020-09-30
Value	894000.0	1280000.0
Percentage of InvestmentOwnedBalanceShares	100.0	100.0

us-gaap:Investments

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	49	50	52	61	66
Percentage of Investments	100.0	100.0	100.0	100.0	100.0

us-gaap:Investments us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:InvestmentsInAndAdvancesToAffiliatesCategorization

msge:OtherEquityMethodInvestee, us-gaap:EquityMethodInvestments

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	7.894	8.25	8.661	8.007	8.372
Percentage of Investments	15.9	16.2	16.5	12.9	12.6

msge:OtherInvestees, msge:EquitySecuritiesInvestmentWithoutReadilyDeterminableFairValue

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	3.5	3.5	3.5	13	13
Percentage of Investments	7.1	6.9	6.7	21.5	20.8

msge:SACO, us-gaap:EquityMethodInvestments

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	38	39	40	40	44
Percentage of Investments	77.0	77.0	76.9	65.6	66.6

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

Period End	2020-12-31	2020-09-30
Value	25	37
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	100.0	100.0

us-gaap:LineOfCredit dei:LegalEntity, us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:LineOfCredit

msg:Tao, us-gaap:RevolvingCreditFacility, msg:TAO2019SeniorCreditAgreement, us-gaap:LoansPayable, us-gaap:SubsequentEvent

Period End	2020-08-06
Value	25
Percentage of LineOfCredit	100.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity dei:LegalEntity, us-gaap:CreditFacility, us-gaap:DebtInstrument

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

msge:TaoGroupHospitality, us-gaap:RevolvingCreditFacility, msge:TAO2019SeniorCreditAgreement

Period End	2020-12-31	2020-09-30
Value	17	24
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity	100.0	100.0

us-gaap:LoansPayable us-gaap:ConsolidationItems, us-gaap:LineOfCreditFacility, us-gaap:SubordinatedBorrowing

us-gaap:LoansPayable

srt:ConsolidationEliminations, msge:MadisonSquareGardenEntertainment, msge:TaoGroupHospitality

Period End	2020-12-31	2020-09-30	2020-06-30	2019-05-23
Value	62	59	49	49
Percentage of LoansPayable	100.0	100.0	100.0	100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive

msge:MSGNationalPropertiesLLC, msge:NationalPropertiesNov2020SeniorSecuredTermLoanAgreement, us-gaap:LoansPayable

Period End	2020-12-31
Value	620
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

msge:MSGNationalPropertiesLLC, msge:NationalPropertiesNov2020SeniorSecuredTermLoanAgreement, us-gaap:LoansPayable

Period End	2020-12-31
Value	3250000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

msge:MSGNationalPropertiesLLC, msge:NationalPropertiesNov2020SeniorSecuredTermLoanAgreement, us-gaap:LoansPayable

Period End	2020-12-31
Value	6500000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

msge:MSGNationalPropertiesLLC, msge:NationalPropertiesNov2020SeniorSecuredTermLoanAgreement, us-gaap:LoansPayable

Period End	2020-12-31
Value	6.5
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

msge:MSGNationalPropertiesLLC, msge:NationalPropertiesNov2020SeniorSecuredTermLoanAgreement, us-gaap:LoansPayable

Period End	2020-12-31
Value	6500000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo

msge:MSGNationalPropertiesLLC, msge:NationalPropertiesNov2020SeniorSecuredTermLoanAgreement, us-gaap:LoansPayable

Period End	2020-12-31
Value	6500000.0
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

Period End	2020-12-31	2020-09-30
Value	9.27	9.21
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent	100.0	100.0

us-gaap:PrepaidExpenseCurrent

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	56	62	62	39	24
Percentage of PrepaidExpenseCurrent	100.0	100.0	100.0	100.0	100.0

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30	2018-06-30	2017-06-30
Value	14	17	20	23	67	76	80
Percentage of RedeemableNoncontrollingInterestEquityCarryingAmount	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount us-gaap:StatementEquityComponents

msge:LiabilitiesRedeemableNoncontrollingInterestsandEquity

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-06-30
Value	14	17	20	23	66	66	67	71	72	76
Percentage of RedeemableNoncontrollingInterestEquityCarryingAmount	100.0	100.0	100.0	100.0	0.0	0.0	100.0	0.0	0.0	100.0

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-06-30	2017-06-30
Value	26	27	17	17	17	10	10	8.061	6.711	4.725
Percentage of RestrictedCashAndCashEquivalentsAtCarryingValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue us-gaap:RestrictedCashAndCashEquivalentsCashAndCashEquivalents

us-gaap:Debt

Period End	2020-12-31	2020-09-30
Value	8.1	9.8
Percentage of RestrictedCashAndCashEquivalentsAtCarryingValue	30.9	35.2

us-gaap:RestructuringReserve

Period End	2020-12-31	2020-09-30
Value	1857000.0	4789000.0
Percentage of RestructuringReserve	100.0	100.0

us-gaap:RevenueRemainingPerformanceObligation

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31
Value	8.253	7.518	101	21
Percentage of RevenueRemainingPerformanceObligation	100.0	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber msge:TypesOfVesting, us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

msge:NonPerformanceVesting, us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	504000.0	496000.0	277000.0	220000.0	215000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	100.0	100.0	100.0	100.0	100.0

msge:PerformanceVesting, us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	510000.0	559000.0	328000.0	330000.0	354000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	101.2	112.7	118.4	150.0	164.7

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-06-30
Value	73.8	72.78	75.34	265.47	252.51
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	100.0	100.0	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

Period End	2020-12-31	2020-09-30
Value	64.36	97.76
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue

Period End	2020-12-31	2020-09-30
Value	3817000.0	388000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	100.0	100.0

us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions msge:TypesOfVesting

us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions

msge:NonPerformanceVesting

Period End	2020-12-31	2020-09-30
Value	94000.0	287000.0
Percentage of ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions	100.0	100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

Period End	2020-12-31	2020-09-30
Value	3817000.0	258000.0
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	100.0	100.0

us-gaap:TerminationLoans us-gaap:AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyType, us-gaap:CreditFacility, us-gaap:RelatedPartyTransactionsByRelatedParty, us-gaap:SubsequentEventType

us-gaap:TerminationLoans

msge:Knicks, msge:DelayedDrawFacilities, msge:MadisonSquareGardenSports, us-gaap:SubsequentEvent

Period End	2020-11-06
Value	110
Percentage of TerminationLoans	100.0

msge:Rangers, msge:DelayedDrawFacilities, msge:MadisonSquareGardenSports, us-gaap:SubsequentEvent

Period End	2020-11-06
Value	90
Percentage of TerminationLoans	81.8

Line plots across dimensions of each concept

us-gaap:CommonStockValue
us-gaap:StatementClassOfStock
(None,)

SG&A Ratio
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)

TTM Greenblatt ROC
_
(None,)

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents
(None,)

us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)

us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems
(None,)

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents
(None,)

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidationItems, us-gaap:ProductOrService, us-gaap:TimingOfTransferOfGoodOrService
('us-gaap:IntersegmentElimination', None, 'us-gaap:TransferredAtPointInTime')

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService, us-gaap:TimingOfTransferOfGoodOrService
(None, 'us-gaap:TransferredAtPointInTime')

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidationItems, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None, 'msge:MadisonSquareGardenEntertainment')

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidationItems, us-gaap:ProductOrService
('us-gaap:IntersegmentElimination', None)

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
(None,)

us-gaap:Revenues
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)

us-gaap:SellingGeneralAndAdministrativeExpense
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType
(None,)

us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwill
us-gaap:IndefiniteLivedIntangibleAssetsByMajorClass
(None,)

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
(None,)

us-gaap:EquitySecuritiesFvNi
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:FinancialInstrument
(None, 'us-gaap:CommonStock')

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents
(None,)

us-gaap:CommonStockValue
us-gaap:StatementClassOfStock
(None,)

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents
(None,)

us-gaap:DepreciationDepletionAndAmortization
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents
(None,)

us-gaap:ShareBasedCompensation
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)

MSGE

Table of contents

Plots across concepts

Tables

Common Stock Value

us-gaap:CommonStockValue us-gaap:StatementClassOfStock

us-gaap:CommonStockValue

us-gaap:CommonClassA

us-gaap:CommonClassB

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonClassA

Weighted Average Number Of Share Outstanding Basic And Diluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

us-gaap:WeightedAverageNumberOfShareOutstandingBasicAndDiluted

Earnings Per Share Basic And Diluted

us-gaap:EarningsPerShareBasicAndDiluted

us-gaap:EarningsPerShareBasicAndDiluted

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax us-gaap:StatementEquityComponents

us-gaap:Parent

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:NoncontrollingInterest

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit

Income Taxes Paid

us-gaap:IncomeTaxesPaid

us-gaap:IncomeTaxesPaid

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

msge:MSGSportsCorpInvestment

us-gaap:Parent

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination

us-gaap:MaterialReconcilingItems

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, msge:MadisonSquareGardenEntertainment

us-gaap:OperatingSegments, msge:TaoGroupHospitality

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

us-gaap:Parent

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss

Realized Investment Gains Losses