ETSY

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

Plots across concepts

IncomeStatement

Expenses

Balance Sheet

Assets

Current Assets

NonCurrent Assets

Liabilities

Current Liabilities

Noncurrent Liabilities

Stockholders Equity

CashFlow

NetCashProvidedByUsedInOperatingActivities

NetCashProvidedByUsedInInvestingActivities

NetCashProvidedByUsedInFinancingActivities

NonoperatingIncomeExpense

FiniteLivedIntangibleAssets

AccountsReceivable

Tables

		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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
us-gaap:CommonStockValue	██▇██████████▇▇▇▇▇▇▇▇▇▃▁	0.126	0.119	0.118	0.119	0.119	0.12	0.12	0.12	0.12	0.12	0.12	0.122	0.121	0.118	0.116	0.116	0.115	0.114	0.113	0.113	0.112	0.112	0.045	0.022	NA	NA	NA
us-gaap:CommonStockSharesIssued		NA	119.140637	118.376782	118.342772	118.449657	120.335524	119.933386	119.771702	120.244674	119.545384	119.9546	121.769238	121.067352	117.8494	116.26847	115.973039	115.340742	113.672931	113.011624	112.563354	111.992315	111.892093	44.834221	22.0904695	NA	NA	NA
us-gaap:CommonStockSharesAuthorized		NA	1400.0	1400.0	1400.0	1400.0	1400.0	1400.0	1400.0	1400.0	1400.0	1400.0	1400.0	1400.0	1400.0	1400.0	1400.0	1400.0	1400.0	1400.0	1400.0	1400.0	1400.0	120.0	120.0	NA	NA	NA
us-gaap:CommonStockSharesOutstanding		NA	119.140637	118.376782	118.342772	118.449657	120.335524	119.933386	119.771702	120.244674	119.545384	119.9546	121.769238	121.067352	117.8494	116.26847	115.973039	115.340742	113.672931	113.011624	112.563354	111.992315	111.892093	44.834221	22.0904695	NA	NA	NA
us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStock		NA	119.140637	118.376782	118.342772	118.449657	120.335524	119.933386	119.771702	120.244674	119.545384	119.9546	121.769238	NA	NA	NA	115.973039	NA	NA	NA	112.563354	NA	NA	NA	NA	NA	NA	NA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding	█▆▁	137.560385	134.408041	123.119053	NA	126.243168	130.807743	130.237875	NA	129.086137	125.551759	125.772315	NA	123.224559	120.723938	115.696024	NA	113.757212	113.045888	115.368566	NA	NA	NA	43.703508	NA	NA	NA	NA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic	█▂▁	121.978272	118.865885	118.138186	NA	120.351095	120.198526	119.679149	NA	119.870711	119.450194	121.267092	NA	119.592191	116.933216	115.696024	NA	113.757212	113.045888	112.12947	NA	NA	NA	43.703508	NA	NA	NA	NA
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	▁▁█	8.25511	7.86537	18.693668	NA	4.876812	1.054776	0.286125	NA	0.060363	0.760627	0.653945	NA	2.39651	6.850653	13.090569	NA	12.723237	13.107472	5.008364	NA	12.255795	24.58846	65.660696	NA	64.395151	64.719294	65.483648
us-gaap:EarningsPerShareBasic	██▃▄▃▃▄▅▃▂▃▅▄▃▂▁▂▂▂	0.75	0.81	0.11	0.26	0.12	0.15	0.26	0.34	0.17	0.03	0.11	0.36999999999999994	0.22	0.1	0.0	-0.18	-0.02	-0.06	0.01	NA	NA	NA	-0.84	NA	NA	NA	NA
us-gaap:EarningsPerShareDiluted	██▃▄▃▃▄▅▃▃▃▅▄▃▂▁▂▂▂	0.7	0.75	0.1	0.25	0.12	0.14	0.24	0.32	0.15	0.03	0.1	0.37000000000000005	0.21	0.1	0.0	-0.18	-0.02	-0.06	0.01	NA	NA	NA	-0.84	NA	NA	NA	NA

		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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31

		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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31

		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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax	██▄▅▄▃▃▄▃▃▂▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁	451.478	428.737	228.055	269.998	197.947	181.095	169.339	200.028	150.366	132.387	120.912	136.268	106.38	101.692	96.891	110.209	87.562	85.349	81.847	87.895	65.696	61.365	58.543	64.912	47.634	42.509	40.536
us-gaap:Revenues	██▄▅▄▃▃▄▃▃▂▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁	451.478	428.737	228.055	269.998	197.947	181.095	169.339	200.028	150.366	132.387	120.912	136.268	106.38	101.692	96.891	110.209	87.562	85.349	81.847	87.895	65.696	61.365	58.543	64.912	47.634	42.509	40.536
us-gaap:CostOfRevenue	█▇▅▆▅▄▃▄▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁	120.168	111.381	82.416	90.824	68.949	58.605	52.658	57.111	46.947	45.409	41.295	44.22	36.383	35.724	34.659	37.005	29.314	29.098	27.911	30.196	24.165	21.909	20.709	22.779	18.115	17.345	15.394
us-gaap:CostOfGoodsAndServicesSold	█▇▅▆▅▄▃▄▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁	120.168	111.381	82.416	90.824	68.949	58.605	52.658	57.111	46.947	45.409	41.295	44.22	36.383	35.724	34.659	37.005	29.314	29.098	27.911	30.196	24.165	21.909	20.709	22.779	18.115	17.345	15.394
us-gaap:GrossProfit	██▄▅▃▃▃▄▃▂▂▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁	331.31	317.356	145.639	179.174	128.998	122.49	116.681	142.917	103.419	86.978	79.617	92.048	69.997	65.968	62.232	73.204	58.248	56.251	53.936	57.699	41.531	39.456	37.834	42.133	29.519	25.164	25.142
us-gaap:OperatingExpenses	█▇▅▆▄▄▃▄▃▃▃▃▂▃▂▃▂▂▂▂▂▂▂▂▁▁▁	213.141	198.216	120.274	154.136	114.766	104.642	85.038	113.428	84.682	74.216	65.819	73.758	62.572	77.686	64.333	69.752	55.575	51.582	47.153	49.283	43.198	43.247	42.676	41.957	32.571	28.958	24.723
us-gaap:ResearchAndDevelopmentExpense	██▆▆▆▅▄▅▄▄▃▃▃▄▃▂▂▂▂▂▂▁▁▁▁▁▁	45.908	45.233	37.782	35.701	32.465	28.765	24.947	28.542	24.418	23.568	20.721	17.788	16.958	21.754	18.116	16.116	14.897	11.84	12.23	11.207	11.406	10.072	10.009	9.723	10.077	8.792	8.042
us-gaap:GeneralAndAdministrativeExpense	██▇▇▆▆▄▄▄▄▃▃▄▅▄▄▄▄▃▂▂▃▄▃▂▁▁	40.454	38.276	33.987	34.401	32.203	29.883	24.647	21.524	20.748	21.707	18.904	18.218	22.094	28.411	22.763	22.625	21.942	22.537	19.076	15.6	15.25	17.632	20.457	17.621	13.686	11.4	9.213
us-gaap:SellingAndMarketingExpense	█▇▃▅▃▂▂▄▂▁▁	126.779	114.707	48.505	84.034	50.098	45.994	35.444	63.362	39.516	28.941	26.194	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OperatingIncomeLoss	██▃▃▂▃▃▃▃▂▂▃▂▁▂▂▂▂▂▂▂▁▁▂▁▁▂	118.169	119.14	25.365	25.038	14.232	17.848	31.643	29.489	18.737	12.762	13.798	18.29	7.425	-11.718	-2.101	3.452	2.673	4.669	6.783	8.416	-1.667	-3.791	-4.842	0.176	-3.052	-3.794	0.419
us-gaap:InterestExpense	█▇▇▇▂▂▂▃▃▃▁	10.615	10.026	9.967	9.912	5.077	4.678	4.653	6.154	6.135	6.125	3.764	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:GainsLossesOnExtinguishmentOfDebt	▄	-16.855	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType etsy:ConvertibleSeniorNotesDue2023,us-gaap:ConvertibleDebt	▄	16.9	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:AllocatedShareBasedCompensationExpense	██▇▆▆▅▄▇▄▄▃▃▄▄▃▂▂▂▂▁▂▂▂▂▂▁▁	17.128	16.725	13.811	13.339	12.137	10.837	8.082	14.244	8.916	8.617	6.454	5.991	7.521	8.162	4.885	4.311	4.085	4.268	3.237	1.124	2.923	2.82	3.974	4.042	2.747	2.085	1.176
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	▇█▃▃▃▃▄▃▃▃▃▃▃▂▂▁▂▂▃▂▂▂▁▂▂▂▂	90.393	112.316	9.693	22.751	10.089	16.369	31.437	22.876	14.596	4.625	12.981	18.266	13.24	2.232	-1.473	-16.596	1.964	-3.05	14.806	2.108	-2.796	-1.445	-25.861	-2.255	-4.196	-3.559	-0.25
us-gaap:NonoperatingIncomeExpense	▁▅▃▅▅▅▆▅▅▄▆▆▇█▆▂▆▄▇▅▅▆▂▅▅▆▆	-27.776	-6.824	-15.672	-2.287	-4.143	-1.479	-0.206	-6.613	-4.141	-8.137	-0.817	-0.024	5.815	13.95	0.628	-20.048	-0.709	-7.719	8.023	-6.308	-1.129	2.346	-21.019	-2.431	-1.144	0.235	-0.669
us-gaap:IncomeTaxExpenseBenefit	▅█▅▄▅▅▅▂▄▆▅▁▃▄▅▆▆▆█▆▆▆▇▆▆▅▅	-1.368	15.891	-2.829	-8.54	-4.712	-1.854	-0.142	-18.375	-5.298	1.246	0.014	-26.484	-12.562	-9.437	-1.052	4.787	4.363	4.261	13.614	6.34	4.095	4.909	10.725	3.103	2.075	-0.408	0.213
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax		NA	NA	-2.671	2.949	-3.948	0.982	-1.061	-0.703	-0.544	-0.276	0.124	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OtherComprehensiveIncomeLossNetOfTax		NA	NA	-2.0	2.824	-4.108	1.36	-0.962	-0.726	-0.539	-0.267	0.098	-2.277	-6.227	-13.37	-2.977	13.067	-2.08	4.027	-7.347	4.554	-0.232	-4.643	15.06	NA	NA	NA	NA
us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome		NA	NA	-2.0	NA	-4.108	1.36	-0.962	-0.726	-0.539	-0.267	0.098	-2.277	-6.227	-13.37	-2.977	13.067	-2.08	4.027	-7.347	4.554	-0.232	-4.643	15.06	NA	NA	NA	NA
us-gaap:NetIncomeLoss	██▄▅▄▄▅▅▄▃▄▅▄▄▃▂▃▃▃▃▃▃▁▃▃▃▃	91.761	96.425	12.522	31.291	14.801	18.223	31.579	41.251	19.894	3.379	12.967	44.75	25.802	11.669	-0.421	-21.383	-2.399	-7.311	1.192	-4.232	-6.891	-6.354	-36.586	-5.358	-6.271	-3.151	-0.463
us-gaap:ComprehensiveIncomeNetOfTax	██▃▄▃▃▄▅▃▂▃▅▃▂▂▂▂▂▂▂▂▂▁▂▂▂▂	97.572	99.425	10.522	34.115	10.693	19.583	30.617	40.525	19.355	3.112	13.065	42.473	19.575	-1.701	-3.398	-8.316	-4.479	-3.284	-6.155	0.322	-7.123	-10.997	-21.526	-6.696	-8.854	-3.299	-0.488
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic	██▃▄▃▃▄▅▃▂▃▅▄▃▂▁▂▂▂	91.761	96.425	12.522	31.291	14.801	18.214	31.564	41.231	19.884	3.376	12.954	44.707	25.777	11.652	-0.421	-21.383	-2.399	-7.311	1.185	NA	NA	NA	-36.586	NA	NA	NA	NA
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted	██▃▄▃▃▄▅▃▂▃▅▄▃▂▁▂▂	96.255	100.394	12.522	31.291	14.801	18.223	31.579	41.251	19.894	3.379	12.967	44.75	25.802	12.501	-0.421	-21.383	-2.399	-7.311	NA	NA	NA	NA	NA	NA	NA	NA	NA

		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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31

		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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
us-gaap:Assets	█▆▆▆▅▄▄▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁▁	2214.505	1762.031	1517.642	1542.352	1499.198	1021.775	981.168	901.851	907.368	865.31	870.165	605.583	574.062	554.317	530.739	581.193	569.201	550.956	549.176	553.061	538.621	529.128	331.362	249.135	NA	NA	NA
us-gaap:Liabilities	█▆▆▆▆▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▁▁▁	1547.838	1237.856	1110.795	1135.718	1109.936	579.474	561.155	500.953	512.749	495.219	485.678	208.689	225.847	246.038	235.691	236.436	224.745	217.935	219.645	222.563	215.827	203.367	196.248	101.835	NA	NA	NA
us-gaap:LiabilitiesAndStockholdersEquity	█▆▆▆▅▄▄▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁▁	2214.505	1762.031	1517.642	1542.352	1499.198	1021.775	981.168	901.851	907.368	865.31	870.165	605.583	574.062	554.317	530.739	581.193	569.201	550.956	549.176	553.061	538.621	529.128	331.362	249.135	NA	NA	NA
us-gaap:StockholdersEquity	█▆▅▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▁▁	666.667	524.175	406.847	406.634	389.262	442.301	420.013	400.898	394.619	370.091	384.487	396.894	348.215	308.279	295.048	344.757	344.456	333.021	329.531	330.498	322.794	325.761	54.902	67.088	NA	NA	NA

		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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
us-gaap:AssetsCurrent	█▆▄▅▅▄▄▃▄▃▄▂▂▂▂▂▂▂▂▂▂▂▁▁	1697.831	1194.335	906.952	921.038	945.84	743.653	724.001	680.289	707.949	666.233	704.997	439.264	400.383	376.228	355.24	371.032	353.406	346.777	340.612	359.054	349.314	343.357	142.288	129.993	NA	NA	NA
us-gaap:CashAndCashEquivalentsAtCarryingValue	█▅▄▄▅▃▃▃▃▃▄▃▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁	1144.974	677.524	442.354	443.293	671.769	359.159	345.674	366.985	362.727	357.82	533.855	315.442	260.288	226.885	194.807	181.592	188.03	167.482	158.381	271.244	266.283	268.155	70.739	69.659	71.199	68.45	44.454
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	█▅▃▃▅▂▂▂▂▂▄▂▂▁▁▁	1150.315	682.865	447.695	448.634	677.11	364.5	351.015	372.326	368.068	363.161	539.196	320.783	265.629	232.226	200.148	186.933	NA	NA	NA	276.585	NA	NA	NA	NA	NA	NA	NA
us-gaap:AccountsReceivableNetCurrent	▃▃▁▂▂▁▁▁█▆▇▇▆▅▅▅▄▃▃▄▂▂▂▂	16.311	16.527	11.712	15.386	12.494	10.585	10.789	12.244	36.385	30.615	31.292	33.677	27.172	24.99	25.085	26.426	20.886	19.507	19.249	20.275	15.976	14.028	14.513	15.404	NA	NA	NA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent	█▅▆▇█▆▅▄▄▃▄▃▃▅▃▂▂▁▁▁▁▁▂▂	43.59	30.768	36.074	38.614	43.934	34.647	26.859	22.686	23.958	18.558	23.738	20.379	17.325	28.916	19.911	15.571	10.84	8.972	9.092	9.521	8.773	7.965	10.789	12.241	NA	NA	NA

		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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	█▇▇▆▅▅▄▄▃▃▃▃▂▂▂▁▁	152.335	141.307	131.114	120.084	108.972	101.248	93.159	85.44	80.248	75.969	71.291	66.226	62.806	56.667	51.176	46.153	42.69	NA	NA	38.091	NA	NA	NA	30.557	NA	NA	NA
us-gaap:Goodwill	█████▂▂▂▂▂▂▂▂▂▂▁▂▁▁▁▁▁▁▁	139.74	138.757	138.305	138.731	138.474	37.342	37.034	37.482	37.802	37.959	39.228	38.541	38.216	37.438	35.97	35.657	37.765	28.147	28.642	27.752	28.366	28.297	28.225	30.831	NA	NA	NA
us-gaap:FiniteLivedIntangibleAssetsNet	▇████▁▁▁▁▁	189.12	191.685	194.874	199.236	202.102	33.142	33.839	34.589	36.36	38.077	NA	4.1	NA	NA	NA	7.507	8.772	NA	NA	2.871	NA	NA	NA	5.41	NA	NA	NA
us-gaap:OtherAssetsNoncurrent	▇▇██▇▇▇▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁	25.834	24.247	28.339	29.542	27.034	25.131	26.303	0.507	0.673	0.676	0.714	0.72	0.879	0.935	0.958	0.985	1.04	0.932	1.721	1.626	1.751	2.113	2.124	2.022	NA	NA	NA

		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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
us-gaap:LiabilitiesCurrent	█▇▄▄▄▄▄▃▃▃▃▂▂▂▂▂▂▂▂▂▂▁▁▁	340.942	279.579	158.849	188.528	154.707	166.51	148.675	112.062	128.931	113.499	106.556	102.477	94.089	88.324	81.153	84.008	77.578	74.511	77.359	80.122	69.614	52.237	46.866	41.453	NA	NA	NA
us-gaap:AccountsPayableCurrent	▇▅▃█▇▆▅█▄▄▂▄▂▂▂▃▂▂▄▄▁▂▂▃	22.13	15.978	10.557	26.324	23.416	20.504	17.325	26.545	14.13	14.76	8.094	13.622	7.241	7.595	6.371	10.978	7.323	7.574	13.571	14.382	3.2	5.955	7.058	8.231	NA	NA	NA
us-gaap:TaxesPayableCurrent	█▁	72.798	64.32	NA	39.25	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:AccruedLiabilitiesCurrent	█▆▃▄▃▃▂▂▂▂▂▂▁▂▁▁▁▂▁▂▂▁▁▁	174.206	134.016	68.885	88.345	70.325	55.687	40.123	49.158	37.191	35.447	35.384	28.743	26.288	30.377	22.638	24.179	20.037	29.448	22.905	31.253	32.861	27.344	21.893	17.442	NA	NA	NA
us-gaap:OtherLiabilitiesCurrent	█▅▅▅▅▅▆▂▁▂▂▂▁▁▃▄▂▂▃▃▅	12.383	8.474	7.985	8.181	7.289	8.413	9.266	3.925	2.676	2.925	3.167	3.394	2.499	2.134	5.327	6.557	3.88	2.977	4.367	4.903	7.925	NA	NA	4.59	NA	NA	NA
us-gaap:ContractWithCustomerLiabilityCurrent	█▆▄▃▃▄▃▃▂▁	10.508	9.181	8.25	7.617	7.434	8.011	7.787	7.478	7.18	6.44	NA	6.262	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
us-gaap:LongTermDebt	█▆▆▆▆▃▃▃▃▃▃▁	1054.604	803.227	794.129	785.126	776.127	284.011	280.226	276.486	272.79	269.133	265.415	0.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:DeferredIncomeTaxLiabilitiesNet	▅▆▅▆█▁▁▁	63.448	66.301	63.126	64.497	83.13	32.642	32.637	30.455	NA	NA	NA	23.786	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OtherLiabilitiesNoncurrent	█▇██▇▇▇▄▄▄▄▄▅▅▅▅▅▄▄▄▄▄▄▁	41.697	39.491	43.233	43.956	40.396	38.902	40.007	19.864	17.378	17.464	18.132	18.262	25.971	25.827	25.308	24.704	23.746	22.761	22.274	21.646	21.699	21.656	21.569	1.913	NA	NA	NA

		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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
us-gaap:StockholdersEquity	█▆▅▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▁▁	666.667	524.175	406.847	406.634	389.262	442.301	420.013	400.898	394.619	370.091	384.487	396.894	348.215	308.279	295.048	344.757	344.456	333.021	329.531	330.498	322.794	325.761	54.902	67.088	NA	NA	NA
us-gaap:CommonStockValue	██▇██████████▇▇▇▇▇▇▇▇▇▃▁	0.126	0.119	0.118	0.119	0.119	0.12	0.12	0.12	0.12	0.12	0.12	0.122	0.121	0.118	0.116	0.116	0.115	0.114	0.113	0.113	0.112	0.112	0.045	0.022	NA	NA	NA
us-gaap:AdditionalPaidInCapital	█▆▆▆▆▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▁▁	886.295	675.213	657.311	642.628	637.176	573.611	570.906	562.033	551.293	546.121	542.554	499.441	482.936	462.578	447.648	442.51	433.894	417.981	411.208	406.02	398.639	394.483	112.694	103.355	NA	NA	NA
us-gaap:RetainedEarningsAccumulatedDeficit	▂▄▁▁▁▅▄▄▄▃▄▆▅▄▃▅▆▆▆▆▆▇▇█	-217.866	-143.458	-239.883	-227.414	-236.51	-124.015	-142.238	-153.442	-149.707	-169.602	-151.906	-96.29	-130.74	-156.542	-168.211	-116.341	-94.958	-92.559	-85.248	-86.44	-82.208	-75.317	-68.963	-32.377	NA	NA	NA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax	▃▂▁▂▁▂▂▂▂▂▂▂▃▄▇█▅▅▄▆▅▅▆▃	-1.888	-7.699	-10.699	-8.699	-11.523	-7.415	-8.775	-7.813	-7.087	-6.548	-6.281	-6.379	-4.102	2.125	15.495	18.472	5.405	7.485	3.458	10.805	6.251	6.483	11.126	-3.934	NA	NA	NA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	██▆▆▅▄▃▆▃▃▁	17.448	16.975	13.985	13.478	12.323	11.28	8.616	13.441	9.563	9.179	5.99	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities	▇█▂▃▂▃▂▄▂▂▂▂▂▁▁▂▁▂▁▁▁▁▁▁▁▁▁	185.194	220.431	29.664	78.581	47.045	49.836	31.458	101.793	30.62	40.091	26.421	35.098	16.874	12.139	3.309	18.518	9.206	17.249	1.786	10.204	5.375	4.737	8.895	0.101	5.072	0.73	6.184
us-gaap:NetCashProvidedByUsedInInvestingActivities	███▁▄▇▇▆▇▃▆████▇█▇▅▇▇▇▇▇▇▇▇	18.911	16.639	6.093	-280.118	-160.3	-25.951	-22.004	-41.215	-16.728	-181.797	-45.653	24.018	8.187	17.237	12.394	-23.44	8.316	-5.88	-114.426	-5.148	-6.115	-5.395	-6.625	-3.431	-0.969	-12.321	-4.002
us-gaap:NetCashProvidedByUsedInFinancingActivities	▆▂▁▁█▂▁▁▂▁▅▂▂▂▂▂▂▂▂▂▂▅▂▂▂▂▂	259.077	-5.825	-32.678	-28.581	428.792	-11.297	-29.307	-53.019	-8.466	-31.069	236.56	-3.432	7.489	1.414	-2.032	2.057	3.952	-0.452	0.253	0.565	-0.119	197.487	1.675	4.222	-0.279	35.934	5.36
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	█▆▃▁▆▃▃▃▃▂▅▄▄▄▃	467.45	235.17	-0.939	-228.476	312.61	13.485	-21.311	4.258	4.907	-176.035	218.413	55.154	33.403	32.078	13.215	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities	▇█▂▃▂▃▂▄▂▂▂▂▂▁▁▂▁▂▁▁▁▁▁▁▁▁▁	185.194	220.431	29.664	78.581	47.045	49.836	31.458	101.793	30.62	40.091	26.421	35.098	16.874	12.139	3.309	18.518	9.206	17.249	1.786	10.204	5.375	4.737	8.895	0.101	5.072	0.73	6.184
us-gaap:NetIncomeLoss	██▄▅▄▄▅▅▄▃▄▅▄▄▃▂▃▃▃▃▃▃▁▃▃▃▃	91.761	96.425	12.522	31.291	14.801	18.223	31.579	41.251	19.894	3.379	12.967	44.75	25.802	11.669	-0.421	-21.383	-2.399	-7.311	1.192	-4.232	-6.891	-6.354	-36.586	-5.358	-6.271	-3.151	-0.463
us-gaap:DepreciationDepletionAndAmortization	█▇██▆▄▅▃▃▂▂▃▃▃▃▃▂▂▁▁▂▁▁▁▁▁▁	15.754	14.171	15.163	15.271	12.808	9.81	10.142	7.626	6.439	6.357	6.32	6.577	7.022	6.66	6.938	6.905	5.786	5.103	4.731	4.509	4.968	4.732	4.341	4.731	4.465	4.132	3.895
us-gaap:ShareBasedCompensation	██▆▆▅▄▂▆▃▂▁	17.128	16.725	13.811	13.339	12.137	10.837	8.082	14.244	8.916	8.617	6.454	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities	███▁▄▇▇▆▇▃▆████▇█▇▅▇▇▇▇▇▇▇▇	18.911	16.639	6.093	-280.118	-160.3	-25.951	-22.004	-41.215	-16.728	-181.797	-45.653	24.018	8.187	17.237	12.394	-23.44	8.316	-5.88	-114.426	-5.148	-6.115	-5.395	-6.625	-3.431	-0.969	-12.321	-4.002
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment	▁▁▁▂▂▃▁▁▁▁▁▁▁▂▂▂▅█▆▂▃▂▂▁▁▁▁	0.179	-0.358	0.567	1.639	2.142	3.064	0.683	0.577	0.138	0.112	0.192	0.076	0.279	0.893	2.7	1.828	7.875	15.408	10.87	1.592	4.98	2.692	1.852	0.423	0.086	0.224	0.571

		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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities	▆▂▁▁█▂▁▁▂▁▅▂▂▂▂▂▂▂▂▂▂▅▂▂▂▂▂	259.077	-5.825	-32.678	-28.581	428.792	-11.297	-29.307	-53.019	-8.466	-31.069	236.56	-3.432	7.489	1.414	-2.032	2.057	3.952	-0.452	0.253	0.565	-0.119	197.487	1.675	4.222	-0.279	35.934	5.36
us-gaap:PaymentsForRepurchaseOfCommonStock	█▁▂▂▆▁▂▃▁▂▄▁▁▁▁▁▁▁▁▁▁	166.17	0.0	24.992	22.195	127.298	0.0	27.492	44.986	0.0	21.075	68.586	5.404	2.869	1.231	0.797	0.625	0.453	0.18	0.0	0.0	0.0	NA	NA	NA	NA	NA	NA

		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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31

Common Stock Value

us-gaap:CommonStockValue

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-04-30
Value	0.126	0.119	0.118	0.119	0.119	0.12	0.12	0.12	0.12	0.12	0.12	0.122	0.121	0.118	0.116	0.116	0.115	0.114	0.113	0.113	0.112	0.112	0.045	0.022	17
Percentage of CommonStockValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-04-30	2013-12-31
Value	119	118	118	118	120	119	119	120	119	119	121	121	117	116	115	115	113	113	112	111	111	44	22	1.6509435	16
Percentage of CommonStockSharesIssued	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Common Stock Shares Authorized

us-gaap:CommonStockSharesAuthorized

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	1400	1400	1400	1400	1400	1400	1400	1400	1400	1400	1400	1400	1400	1400	1400	1400	1400	1400	1400	1400	1400	120	120
Percentage of CommonStockSharesAuthorized	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2013-12-31
Value	119	118	118	118	120	119	119	120	119	119	121	121	117	116	115	115	113	113	112	111	111	44	22	16
Percentage of CommonStockSharesOutstanding	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents

us-gaap:CommonStock

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2016-12-31	2015-12-31
Value	119	118	118	118	120	119	119	120	119	119	121	115	112
Percentage of CommonStockSharesOutstanding	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

Period End	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31	2017-09-30	2017-06-30	2017-03-31	2016-09-30	2016-06-30	2016-03-31	2015-03-31
Value	137	134	123	126	130	130	129	125	125	123	120	115	113	113	115	43
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

Period End	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31	2017-09-30	2017-06-30	2017-03-31	2016-09-30	2016-06-30	2016-03-31	2015-03-31
Value	121	118	118	120	120	119	119	119	121	119	116	115	113	113	112	43
Percentage of WeightedAverageNumberOfSharesOutstandingBasic	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

Period End	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31	2017-09-30	2017-06-30	2017-03-31	2016-09-30	2016-06-30	2016-03-31	2015-09-30	2015-06-30	2015-03-31	2014-09-30	2014-06-30	2014-03-31
Value	8.25511	7.86537	18	4.876812	1.054776	0.286125	0.060363	0.760627	0.653945	2.39651	6.850653	13	12	13	5.008364	12	24	65	64	64	65
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:ConvertibleDebtSecurities

Period End	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30
Value	8.213081	7.4126	16	3.647693	0.0	0.0	0.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	99.5	94.2	90.5	74.8	0.0	0.0	0.0

us-gaap:EmployeeStockOption

Period End	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31	2017-09-30	2017-06-30	2017-03-31	2016-09-30	2016-06-30	2016-03-31	2015-09-30	2015-06-30	2015-03-31	2014-09-30	2014-06-30	2014-03-31
Value	0.005769	0.410409	0.624906	0.392435	0.337907	0.111444	0.008166	0.642418	0.225099	2.211038	6.201891	9.543393	10	11	4.394503	11	12	12	10	11	11
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0.1	5.2	3.3	8.0	32.0	38.9	13.5	84.5	34.4	92.3	90.5	72.9	81.5	84.9	87.7	97.1	48.9	18.3	16.7	17.1	18.1

us-gaap:RestrictedStockUnitsRSU

Period End	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31	2017-09-30	2017-06-30	2017-03-31	2016-09-30	2016-06-30	2016-03-31	2015-09-30	2015-06-30	2015-03-31	2014-09-30	2014-06-30
Value	0.03626	0.042361	1.144169	0.836684	0.716869	0.174681	0.052197	0.118209	0.428846	0.185472	0.648762	3.547176	2.358365	1.941768	0.613861	0.148188	0.030794	0.0	0.0	0.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0.4	0.5	6.1	17.2	68.0	61.1	86.5	15.5	65.6	7.7	9.5	27.1	18.5	14.8	12.3	1.2	0.1	0.0	0.0	0.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-03-31
Value	0.75	0.81	0.11	0.26	0.12	0.15	0.26	0.34	0.17	0.03	0.11	0.37	0.22	0.1	0	-0.18	-0.02	-0.06	0.01	-0.84
Percentage of EarningsPerShareBasic	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-03-31
Value	0.7	0.75	0.1	0.25	0.12	0.14	0.24	0.32	0.15	0.03	0.1	0.37	0.21	0.1	0	-0.18	-0.02	-0.06	0.01	-0.84
Percentage of EarningsPerShareDiluted	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	451	428	228	269	197	181	169	200	150	132	120	136	106	101	96	110	87	85	81	87	65	61	58	64	47	42	40
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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:ProductOrService

etsy:MarketplaceRevenue

Period End	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31	2017-09-30	2017-06-30	2017-03-31
Value	341	332	155	140	134	126	110	91	87	77	75	70
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	75.7	77.4	68.4	71.2	74.2	74.5	73.8	69.0	72.8	73.1	74.2	72.8
Percentage of Revenues	75.7	77.4	68.4	71.2	74.2	74.5	73.8	69.0	72.8	73.1	74.2	72.8
Percentage of Revenues etsy:MarketplaceRevenue	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

etsy:ServicesRevenue

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	109	96	72	80	56	45	42
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	24.3	22.6	31.6	29.8	28.5	25.3	24.9
Percentage of Revenues	24.3	22.6	31.6	29.8	28.5	25.3	24.9
Percentage of Revenues etsy:ServicesRevenue	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Revenues

us-gaap:Revenues

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	451	428	228	269	197	181	169	200	150	132	120	136	106	101	96	110	87	85	81	87	65	61	58	64	47	42	40
Percentage of Revenues	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Cost Of Revenue

us-gaap:CostOfRevenue

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	120	111	82	90	68	58	52	57	46	45	41	44	36	35	34	37	29	29	27	30	24	21	20	22	18	17	15
Percentage of CostOfRevenue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	26.6	26.0	36.1	33.6	34.8	32.4	31.1	28.6	31.2	34.3	34.2	32.5	34.2	35.1	35.8	33.6	33.5	34.1	34.1	34.4	36.8	35.7	35.4	35.1	38.0	40.8	38.0

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	120	111	82	90	68	58	52	57	46	45	41	44	36	35	34	37	29	29	27	30	24	21	20	22	18	17	15
Percentage of CostOfGoodsAndServicesSold	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	26.6	26.0	36.1	33.6	34.8	32.4	31.1	28.6	31.2	34.3	34.2	32.5	34.2	35.1	35.8	33.6	33.5	34.1	34.1	34.4	36.8	35.7	35.4	35.1	38.0	40.8	38.0

Gross Profit

us-gaap:GrossProfit

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	331	317	145	179	128	122	116	142	103	86	79	92	69	65	62	73	58	56	53	57	41	39	37	42	29	25	25
Percentage of GrossProfit	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	73.4	74.0	63.9	66.4	65.2	67.6	68.9	71.4	68.8	65.7	65.8	67.5	65.8	64.9	64.2	66.4	66.5	65.9	65.9	65.6	63.2	64.3	64.6	64.9	62.0	59.2	62.0

Operating Expenses

us-gaap:OperatingExpenses

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	213	198	120	154	114	104	85	113	84	74	65	73	62	77	64	69	55	51	47	49	43	43	42	41	32	28	24
Percentage of OperatingExpenses	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	47.2	46.2	52.7	57.1	58.0	57.8	50.2	56.7	56.3	56.1	54.4	54.1	58.8	76.4	66.4	63.3	63.5	60.4	57.6	56.1	65.8	70.5	72.9	64.6	68.4	68.1	61.0

Research And Development Expense

us-gaap:ResearchAndDevelopmentExpense

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	45	45	37	35	32	28	24	28	24	23	20	17	16	21	18	16	14	11	12	11	11	10	10	9.723	10	8.792	8.042
Percentage of ResearchAndDevelopmentExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	10.2	10.6	16.6	13.2	16.4	15.9	14.7	14.3	16.2	17.8	17.1	13.1	15.9	21.4	18.7	14.6	17.0	13.9	14.9	12.8	17.4	16.4	17.1	15.0	21.2	20.7	19.8

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	40	38	33	34	32	29	24	21	20	21	18	18	22	28	22	22	21	22	19	15	15	17	20	17	13	11	9.213
Percentage of GeneralAndAdministrativeExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	9.0	8.9	14.9	12.7	16.3	16.5	14.6	10.8	13.8	16.4	15.6	13.4	20.8	27.9	23.5	20.5	25.1	26.4	23.3	17.7	23.2	28.7	34.9	27.1	28.7	26.8	22.7

Selling And Marketing Expense

us-gaap:SellingAndMarketingExpense

Period End	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	2018-06-30	2018-03-31
Value	126	114	48	84	50	45	35	63	39	28	26
Percentage of SellingAndMarketingExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	28.1	26.8	21.3	31.1	25.3	25.4	20.9	31.7	26.3	21.9	21.7

Operating Income Loss

us-gaap:OperatingIncomeLoss

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	118	119	25	25	14	17	31	29	18	12	13	18	7.425	-11.718	-2.101	3.452	2.673	4.669	6.783	8.416	-1.667	-3.791	-4.842	0.176	-3.052	-3.794	0.419
Percentage of OperatingIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	26.2	27.8	11.1	9.3	7.2	9.9	18.7	14.7	12.5	9.6	11.4	13.4	7.0	-11.5	-2.2	3.1	3.1	5.5	8.3	9.6	-2.5	-6.2	-8.3	0.3	-6.4	-8.9	1.0

Interest Expense

us-gaap:InterestExpense

Period End	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	2018-06-30	2018-03-31
Value	10	10	9.967	9.912	5.077	4.678	4.653	6.154	6.135	6.125	3.764
Percentage of InterestExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	2.4	2.3	4.4	3.7	2.6	2.6	2.7	3.1	4.1	4.6	3.1

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

Period End	2020-09-30
Value	-16.855
Percentage of GainsLossesOnExtinguishmentOfDebt	100.0
Percentage of Revenues	-3.7

us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:DebtInstrument, us-gaap:LongtermDebtType

etsy:ConvertibleSeniorNotesDue2023, us-gaap:ConvertibleDebt

Period End	2020-09-30
Value	16
Percentage of GainsLossesOnExtinguishmentOfDebt	-100.3
Percentage of Revenues	3.7
Percentage of Revenues etsy:ConvertibleSeniorNotesDue2023 us-gaap:ConvertibleDebt	0.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	17	16	13	13	12	10	8.082	14	8.916	8.617	6.454	5.991	7.521	8.162	4.885	4.311	4.085	4.268	3.237	1.124	2.923	2.82	3.974	4.042	2.747	2.085	1.176
Percentage of AllocatedShareBasedCompensationExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	3.8	3.9	6.1	4.9	6.1	6.0	4.8	7.1	5.9	6.5	5.3	4.4	7.1	8.0	5.0	3.9	4.7	5.0	4.0	1.3	4.4	4.6	6.8	6.2	5.8	4.9	2.9

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:IncomeStatementLocation

etsy:CostofRevenue

Period End	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	2018-06-30	2018-03-31
Value	2.032	1.907	1.62	1.658	1.574	1.456	1.099	0.99	0.894	0.927	0.546
Percentage of AllocatedShareBasedCompensationExpense	11.9	11.4	11.7	12.4	13.0	13.4	13.6	7.0	10.0	10.8	8.5
Percentage of Revenues	0.5	0.4	0.7	0.6	0.8	0.8	0.6	0.5	0.6	0.7	0.5
Percentage of Revenues etsy:CostofRevenue	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:GeneralAndAdministrativeExpense

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	5.068	4.989	4.166	3.938	3.615	3.364	2.832	2.693	2.683	2.966	2.791	2.948	4.425	5.183	2.057	1.687	2.334	2.771	2.002	-0.156	1.898	1.889	2.919	3.109	1.998	1.393	0.76
Percentage of AllocatedShareBasedCompensationExpense	29.6	29.8	30.2	29.5	29.8	31.0	35.0	18.9	30.1	34.4	43.2	49.2	58.8	63.5	42.1	39.1	57.1	64.9	61.8	-13.9	64.9	67.0	73.5	76.9	72.7	66.8	64.6
Percentage of Revenues	1.1	1.2	1.8	1.5	1.8	1.9	1.7	1.3	1.8	2.2	2.3	2.2	4.2	5.1	2.1	1.5	2.7	3.2	2.4	-0.2	2.9	3.1	5.0	4.8	4.2	3.3	1.9
Percentage of Revenues us-gaap:GeneralAndAdministrativeExpense	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:ResearchAndDevelopmentExpense

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	8.668	8.472	6.801	6.519	5.752	5.294	3.52	9.873	4.697	4.025	2.639	2.021	2.18	2.053	2.02	1.962	1.234	1.026	0.857	0.879	0.756	0.681	0.544	0.466	0.333	0.371	0.291
Percentage of AllocatedShareBasedCompensationExpense	50.6	50.7	49.2	48.9	47.4	48.9	43.6	69.3	52.7	46.7	40.9	33.7	29.0	25.2	41.4	45.5	30.2	24.0	26.5	78.2	25.9	24.1	13.7	11.5	12.1	17.8	24.7
Percentage of Revenues	1.9	2.0	3.0	2.4	2.9	2.9	2.1	4.9	3.1	3.0	2.2	1.5	2.0	2.0	2.1	1.8	1.4	1.2	1.0	1.0	1.2	1.1	0.9	0.7	0.7	0.9	0.7
Percentage of Revenues us-gaap:ResearchAndDevelopmentExpense	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:SellingAndMarketingExpense

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	1.36	1.357	1.224	1.224	1.196	0.723	0.631	0.688	0.642	0.699	0.478	0.514	0.447	0.528	0.444	0.343	0.229	0.221	0.178	0.211	0.12	0.126	0.103	0.085	0.059	0.042	0.03
Percentage of AllocatedShareBasedCompensationExpense	7.9	8.1	8.9	9.2	9.9	6.7	7.8	4.8	7.2	8.1	7.4	8.6	5.9	6.5	9.1	8.0	5.6	5.2	5.5	18.8	4.1	4.5	2.6	2.1	2.1	2.0	2.6
Percentage of Revenues	0.3	0.3	0.5	0.5	0.6	0.4	0.4	0.3	0.4	0.5	0.4	0.4	0.4	0.5	0.5	0.3	0.3	0.3	0.2	0.2	0.2	0.2	0.2	0.1	0.1	0.1	0.1
Percentage of Revenues us-gaap:SellingAndMarketingExpense	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	90	112	9.693	22	10	16	31	22	14	4.625	12	18	13	2.232	-1.473	-16.596	1.964	-3.05	14	2.108	-2.796	-1.445	-25.861	-2.255	-4.196	-3.559	-0.25
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	20.0	26.2	4.3	8.4	5.1	9.0	18.6	11.4	9.7	3.5	10.7	13.4	12.4	2.2	-1.5	-15.1	2.2	-3.6	18.1	2.4	-4.3	-2.4	-44.2	-3.5	-8.8	-8.4	-0.6

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	-27.776	-6.824	-15.672	-2.287	-4.143	-1.479	-0.206	-6.613	-4.141	-8.137	-0.817	-0.024	5.815	13	0.628	-20.048	-0.709	-7.719	8.023	-6.308	-1.129	2.346	-21.019	-2.431	-1.144	0.235	-0.669
Percentage of NonoperatingIncomeExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	-6.2	-1.6	-6.9	-0.8	-2.1	-0.8	-0.1	-3.3	-2.8	-6.1	-0.7	-0.0	5.5	13.7	0.6	-18.2	-0.8	-9.0	9.8	-7.2	-1.7	3.8	-35.9	-3.7	-2.4	0.6	-1.7

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	-1.368	15	-2.829	-8.54	-4.712	-1.854	-0.142	-18.375	-5.298	1.246	0.014	-26.484	-12.562	-9.437	-1.052	4.787	4.363	4.261	13	6.34	4.095	4.909	10	3.103	2.075	-0.408	0.213
Percentage of IncomeTaxExpenseBenefit	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	-0.3	3.7	-1.2	-3.2	-2.4	-1.0	-0.1	-9.2	-3.5	0.9	0.0	-19.4	-11.8	-9.3	-1.1	4.3	5.0	5.0	16.6	7.2	6.2	8.0	18.3	4.8	4.4	-1.0	0.5

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

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

Period End	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	-2671000.0	2949000.0	-3948000.0	982000.0	-1061000.0	-703000.0	-544000.0	-276000.0	124000.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	-1.2	1.1	-2.0	0.5	-0.6	-0.4	-0.4	-0.2	0.1

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

Period End	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31
Value	-2.0	2.824	-4.108	1.36	-0.962	-0.726	-0.539	-0.267	0.098	-2.277	-6.227	-13.37	-2.977	13	-2.08	4.027	-7.347	4.554	-0.232	-4.643	15
Percentage of OtherComprehensiveIncomeLossNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	-0.9	1.0	-2.1	0.8	-0.6	-0.4	-0.4	-0.2	0.1	-1.7	-5.9	-13.1	-3.1	11.9	-2.4	4.7	-9.0	5.2	-0.4	-7.6	25.7

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

Period End	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31
Value	-2.0	-4.108	1.36	-0.962	-0.726	-0.539	-0.267	0.098	-2.277	-6.227	-13.37	-2.977	13	-2.08	4.027	-7.347	4.554	-0.232	-4.643	15
Percentage of OtherComprehensiveIncomeLossNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	-0.9	-2.1	0.8	-0.6	-0.4	-0.4	-0.2	0.1	-1.7	-5.9	-13.1	-3.1	11.9	-2.4	4.7	-9.0	5.2	-0.4	-7.6	25.7
Percentage of Revenues 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	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Net Income Loss

us-gaap:NetIncomeLoss

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	91	96	12	31	14	18	31	41	19	3.379	12	44	25	11	-0.421	-21.383	-2.399	-7.311	1.192	-4.232	-6.891	-6.354	-36.586	-5.358	-6.271	-3.151	-0.463
Percentage of NetIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	20.3	22.5	5.5	11.6	7.5	10.1	18.6	20.6	13.2	2.6	10.7	32.8	24.3	11.5	-0.4	-19.4	-2.7	-8.6	1.5	-4.8	-10.5	-10.4	-62.5	-8.3	-13.2	-7.4	-1.1

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31
Value	91	96	12	31	14	18	31	41	19	3.379	12	44	25	11	-0.421	-21.383	-2.399	-7.311	1.192	-4.232	-6.891	-6.354	-36.586
Percentage of NetIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	20.3	22.5	5.5	11.6	7.5	10.1	18.6	20.6	13.2	2.6	10.7	32.8	24.3	11.5	-0.4	-19.4	-2.7	-8.6	1.5	-4.8	-10.5	-10.4	-62.5
Percentage of Revenues us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	97	99	10	34	10	19	30	40	19	3.112	13	42	19	-1.701	-3.398	-8.316	-4.479	-3.284	-6.155	0.322	-7.123	-10.997	-21.526	-6.696	-8.854	-3.299	-0.488
Percentage of ComprehensiveIncomeNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	21.6	23.2	4.6	12.6	5.4	10.8	18.1	20.3	12.9	2.4	10.8	31.2	18.4	-1.7	-3.5	-7.5	-5.1	-3.8	-7.5	0.4	-10.8	-17.9	-36.8	-10.3	-18.6	-7.8	-1.2

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-03-31
Value	91	96	12	31	14	18	31	41	19	3.376	12	44	25	11	-0.421	-21.383	-2.399	-7.311	1.185	-36.586
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	20.3	22.5	5.5	11.6	7.5	10.1	18.6	20.6	13.2	2.6	10.7	32.8	24.2	11.5	-0.4	-19.4	-2.7	-8.6	1.4	-62.5

Net Income Loss Available To Common Stockholders Diluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30
Value	96	100	12	31	14	18	31	41	19	3.379	12	44	25	12	-0.421	-21.383	-2.399	-7.311
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	21.3	23.4	5.5	11.6	7.5	10.1	18.6	20.6	13.2	2.6	10.7	32.8	24.3	12.3	-0.4	-19.4	-2.7	-8.6

Assets

us-gaap:Assets

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	2214	1762	1517	1542	1499	1021	981	901	907	865	870	605	574	554	530	581	569	550	549	553	538	529	331	249
Percentage of Assets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Liabilities

us-gaap:Liabilities

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	1547	1237	1110	1135	1109	579	561	500	512	495	485	208	225	246	235	236	224	217	219	222	215	203	196	101
Percentage of Liabilities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	69.9	70.3	73.2	73.6	74.0	56.7	57.2	55.5	56.5	57.2	55.8	34.5	39.3	44.4	44.4	40.7	39.5	39.6	40.0	40.2	40.1	38.4	59.2	40.9

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	2214	1762	1517	1542	1499	1021	981	901	907	865	870	605	574	554	530	581	569	550	549	553	538	529	331	249
Percentage of LiabilitiesAndStockholdersEquity	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Stockholders Equity

us-gaap:StockholdersEquity

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2013-12-31	2012-12-31
Value	666	524	406	406	389	442	420	400	394	370	384	396	348	308	295	344	344	333	329	330	322	325	54	67	4.003	-0.652
Percentage of StockholdersEquity	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	30.1	29.7	26.8	26.4	26.0	43.3	42.8	44.5	43.5	42.8	44.2	65.5	60.7	55.6	55.6	59.3	60.5	60.4	60.0	59.8	59.9	61.6	16.6	26.9	0.0	0.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2013-12-31	2012-12-31
Value	-1.888	-7.699	-10.699	-8.699	-11.523	-7.415	-8.775	-7.813	-7.087	-6.548	-6.281	-6.379	-4.102	2.125	15	18	5.405	7.485	3.458	10	6.251	6.483	11	-3.934	0.16	-0.052
Percentage of StockholdersEquity	-0.3	-1.5	-2.6	-2.1	-3.0	-1.7	-2.1	-1.9	-1.8	-1.8	-1.6	-1.6	-1.2	0.7	5.3	5.4	1.6	2.2	1.0	3.3	1.9	2.0	20.3	-5.9	4.0	8.0
Percentage of Assets	-0.1	-0.4	-0.7	-0.6	-0.8	-0.7	-0.9	-0.9	-0.8	-0.8	-0.7	-1.1	-0.7	0.4	2.9	3.2	0.9	1.4	0.6	2.0	1.2	1.2	3.4	-1.6	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	0.0	0.0	0.0	0.0	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	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2013-12-31	2012-12-31
Value	886	675	657	642	637	573	570	562	551	546	542	499	482	462	447	442	433	417	411	406	398	394	112	103	20	15
Percentage of StockholdersEquity	132.9	128.8	161.6	158.0	163.7	129.7	135.9	140.2	139.7	147.6	141.1	125.8	138.7	150.1	151.7	128.4	126.0	125.5	124.8	122.9	123.5	121.1	205.3	154.1	523.2	-2408.9
Percentage of Assets	40.0	38.3	43.3	41.7	42.5	56.1	58.2	62.3	60.8	63.1	62.4	82.5	84.1	83.5	84.3	76.1	76.2	75.9	74.9	73.4	74.0	74.6	34.0	41.5	0.0	0.0
Percentage of Assets us-gaap:AdditionalPaidInCapital	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:CommonStock

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2013-12-31	2012-12-31
Value	0.126	0.119	0.118	0.119	0.119	0.12	0.12	0.12	0.12	0.12	0.12	0.122	0.121	0.118	0.116	0.116	0.115	0.114	0.113	0.113	0.112	0.112	0.045	0.044	0.033	0.033
Percentage of StockholdersEquity	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.1	0.1	0.8	-5.1
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2013-12-31	2012-12-31
Value	-217.866	-143.458	-239.883	-227.414	-236.51	-124.015	-142.238	-153.442	-149.707	-169.602	-151.906	-96.29	-130.74	-156.542	-168.211	-116.341	-94.958	-92.559	-85.248	-86.44	-82.208	-75.317	-68.963	-32.377	-17.134	-16.338
Percentage of StockholdersEquity	-32.7	-27.4	-59.0	-55.9	-60.8	-28.0	-33.9	-38.3	-37.9	-45.8	-39.5	-24.3	-37.5	-50.8	-57.0	-33.7	-27.6	-27.8	-25.9	-26.2	-25.5	-23.1	-125.6	-48.3	-428.0	2505.8
Percentage of Assets	-9.8	-8.1	-15.8	-14.7	-15.8	-12.1	-14.5	-17.0	-16.5	-19.6	-17.5	-15.9	-22.8	-28.2	-31.7	-20.0	-16.7	-16.8	-15.5	-15.6	-15.3	-14.2	-20.8	-13.0	0.0	0.0
Percentage of Assets us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Assets Current

us-gaap:AssetsCurrent

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	1697	1194	906	921	945	743	724	680	707	666	704	439	400	376	355	371	353	346	340	359	349	343	142	129
Percentage of AssetsCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	76.7	67.8	59.8	59.7	63.1	72.8	73.8	75.4	78.0	77.0	81.0	72.5	69.7	67.9	66.9	63.8	62.1	62.9	62.0	64.9	64.9	64.9	42.9	52.2

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2012-12-31
Value	1144	677	442	443	671	359	345	366	362	357	533	315	260	226	194	181	188	167	158	271	266	268	70	69	71	68	44	36	34
Percentage of CashAndCashEquivalentsAtCarryingValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	51.7	38.5	29.1	28.7	44.8	35.2	35.2	40.7	40.0	41.4	61.4	52.1	45.3	40.9	36.7	31.2	33.0	30.4	28.8	49.0	49.4	50.7	21.3	28.0	0.0	0.0	0.0	0.0	0.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2015-12-31
Value	1150	682	447	448	677	364	351	372	368	363	539	320	265	232	200	186	276
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	100.0	100.0	100.0	100.0	100.0	100.0	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	51.9	38.8	29.5	29.1	45.2	35.7	35.8	41.3	40.6	42.0	62.0	53.0	46.3	41.9	37.7	32.2	50.0

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	16	16	11	15	12	10	10	12	36	30	31	33	27	24	25	26	20	19	19	20	15	14	14	15
Percentage of AccountsReceivableNetCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	0.7	0.9	0.8	1.0	0.8	1.0	1.1	1.4	4.0	3.5	3.6	5.6	4.7	4.5	4.7	4.5	3.7	3.5	3.5	3.7	3.0	2.7	4.4	6.2

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	43	30	36	38	43	34	26	22	23	18	23	20	17	28	19	15	10	8.972	9.092	9.521	8.773	7.965	10	12
Percentage of PrepaidExpenseAndOtherAssetsCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	2.0	1.7	2.4	2.5	2.9	3.4	2.7	2.5	2.6	2.1	2.7	3.4	3.0	5.2	3.8	2.7	1.9	1.6	1.7	1.7	1.6	1.5	3.3	4.9

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2015-12-31	2014-12-31
Value	152	141	131	120	108	101	93	85	80	75	71	66	62	56	51	46	42	38	30
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	6.9	8.0	8.6	7.8	7.3	9.9	9.5	9.5	8.8	8.8	8.2	10.9	10.9	10.2	9.6	7.9	7.5	6.9	12.3

Goodwill

us-gaap:Goodwill

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2013-12-31
Value	139	138	138	138	138	37	37	37	37	37	39	38	38	37	35	35	37	28	28	27	28	28	28	30	5.346
Percentage of Goodwill	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	6.3	7.9	9.1	9.0	9.2	3.7	3.8	4.2	4.2	4.4	4.5	6.4	6.7	6.8	6.8	6.1	6.6	5.1	5.2	5.0	5.3	5.3	8.5	12.4	0.0

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

Period End	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	2018-06-30	2017-12-31	2016-12-31	2016-09-30	2015-12-31	2014-12-31
Value	189	191	194	199	202	33	33	34	36	38	4.1	7.507	8.772	2.871	5.41
Percentage of FiniteLivedIntangibleAssetsNet	100.0	100.0	100.0	100.0	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	8.5	10.9	12.8	12.9	13.5	3.2	3.4	3.8	4.0	4.4	0.7	1.3	1.5	0.5	2.2

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	25	24	28	29	27	25	26	0.507	0.673	0.676	0.714	0.72	0.879	0.935	0.958	0.985	1.04	0.932	1.721	1.626	1.751	2.113	2.124	2.022
Percentage of OtherAssetsNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	1.2	1.4	1.9	1.9	1.8	2.5	2.7	0.1	0.1	0.1	0.1	0.1	0.2	0.2	0.2	0.2	0.2	0.2	0.3	0.3	0.3	0.4	0.6	0.8

Liabilities Current

us-gaap:LiabilitiesCurrent

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	340	279	158	188	154	166	148	112	128	113	106	102	94	88	81	84	77	74	77	80	69	52	46	41
Percentage of LiabilitiesCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	15.4	15.9	10.5	12.2	10.3	16.3	15.2	12.4	14.2	13.1	12.2	16.9	16.4	15.9	15.3	14.5	13.6	13.5	14.1	14.5	12.9	9.9	14.1	16.6

Accounts Payable Current

us-gaap:AccountsPayableCurrent

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	22	15	10	26	23	20	17	26	14	14	8.094	13	7.241	7.595	6.371	10	7.323	7.574	13	14	3.2	5.955	7.058	8.231
Percentage of AccountsPayableCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	1.0	0.9	0.7	1.7	1.6	2.0	1.8	2.9	1.6	1.7	0.9	2.2	1.3	1.4	1.2	1.9	1.3	1.4	2.5	2.6	0.6	1.1	2.1	3.3

Taxes Payable Current

us-gaap:TaxesPayableCurrent

Period End	2020-09-30	2020-06-30	2019-12-31
Value	72	64	39
Percentage of TaxesPayableCurrent	100.0	100.0	100.0
Percentage of Assets	3.3	3.7	2.5

Accrued Liabilities Current

us-gaap:AccruedLiabilitiesCurrent

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	174	134	68	88	70	55	40	49	37	35	35	28	26	30	22	24	20	29	22	31	32	27	21	17
Percentage of AccruedLiabilitiesCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	7.9	7.6	4.5	5.7	4.7	5.5	4.1	5.5	4.1	4.1	4.1	4.7	4.6	5.5	4.3	4.2	3.5	5.3	4.2	5.7	6.1	5.2	6.6	7.0

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2014-12-31
Value	12	8.474	7.985	8.181	7.289	8.413	9.266	3.925	2.676	2.925	3.167	3.394	2.499	2.134	5.327	6.557	3.88	2.977	4.367	4.903	7.925	4.59
Percentage of OtherLiabilitiesCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	0.6	0.5	0.5	0.5	0.5	0.8	0.9	0.4	0.3	0.3	0.4	0.6	0.4	0.4	1.0	1.1	0.7	0.5	0.8	0.9	1.5	1.8

Contract With Customer Liability Current

us-gaap:ContractWithCustomerLiabilityCurrent

Period End	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	2018-06-30	2017-12-31
Value	10	9.181	8.25	7.617	7.434	8.011	7.787	7.478	7.18	6.44	6.262
Percentage of ContractWithCustomerLiabilityCurrent	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	0.5	0.5	0.5	0.5	0.5	0.8	0.8	0.8	0.8	0.7	1.0

Long Term Debt

us-gaap:LongTermDebt

Period End	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	2018-06-30	2018-03-31	2017-12-31
Value	1054	803	794	785	776	284	280	276	272	269	265	0.0
Percentage of LongTermDebt	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0
Percentage of Assets	47.6	45.6	52.3	50.9	51.8	27.8	28.6	30.7	30.1	31.1	30.5	0.0

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

etsy:ConvertibleSeniorNotesDue2023, us-gaap:ConvertibleDebt

Period End	2020-09-30	2019-12-31
Value	38	291
Percentage of LongTermDebt	3.7	37.2
Percentage of Assets	1.7	18.9
Percentage of Assets etsy:ConvertibleSeniorNotesDue2023 us-gaap:ConvertibleDebt	0.0	0.0

etsy:ConvertibleSeniorNotesDue2026, us-gaap:ConvertibleDebt

Period End	2020-09-30	2019-12-31
Value	508	493
Percentage of LongTermDebt	48.2	62.8
Percentage of Assets	23.0	32.0
Percentage of Assets etsy:ConvertibleSeniorNotesDue2026 us-gaap:ConvertibleDebt	0.0	0.0

etsy:ConvertibleSeniorNotesDue2027, us-gaap:ConvertibleDebt

Period End	2020-09-30
Value	507
Percentage of LongTermDebt	48.1
Percentage of Assets	22.9
Percentage of Assets etsy:ConvertibleSeniorNotesDue2027 us-gaap:ConvertibleDebt	0.0

us-gaap:LongTermDebt us-gaap:LongtermDebtType

us-gaap:ConvertibleDebt

Period End	2020-09-30	2019-12-31
Value	1054	785
Percentage of LongTermDebt	100.0	100.0
Percentage of Assets	47.6	50.9
Percentage of Assets us-gaap:ConvertibleDebt	0.0	0.0

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2017-12-31
Value	63	66	63	64	83	32	32	30	23
Percentage of DeferredIncomeTaxLiabilitiesNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	2.9	3.8	4.2	4.2	5.5	3.2	3.3	3.4	3.9

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	41	39	43	43	40	38	40	19	17	17	18	18	25	25	25	24	23	22	22	21	21	21	21	1.913
Percentage of OtherLiabilitiesNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	1.9	2.2	2.8	2.8	2.7	3.8	4.1	2.2	1.9	2.0	2.1	3.0	4.5	4.7	4.8	4.3	4.2	4.1	4.1	3.9	4.0	4.1	6.5	0.8

Stockholders Equity

us-gaap:StockholdersEquity

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2013-12-31	2012-12-31
Value	666	524	406	406	389	442	420	400	394	370	384	396	348	308	295	344	344	333	329	330	322	325	54	67	4.003	-0.652
Percentage of StockholdersEquity	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	30.1	29.7	26.8	26.4	26.0	43.3	42.8	44.5	43.5	42.8	44.2	65.5	60.7	55.6	55.6	59.3	60.5	60.4	60.0	59.8	59.9	61.6	16.6	26.9	0.0	0.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2013-12-31	2012-12-31
Value	-1.888	-7.699	-10.699	-8.699	-11.523	-7.415	-8.775	-7.813	-7.087	-6.548	-6.281	-6.379	-4.102	2.125	15	18	5.405	7.485	3.458	10	6.251	6.483	11	-3.934	0.16	-0.052
Percentage of StockholdersEquity	-0.3	-1.5	-2.6	-2.1	-3.0	-1.7	-2.1	-1.9	-1.8	-1.8	-1.6	-1.6	-1.2	0.7	5.3	5.4	1.6	2.2	1.0	3.3	1.9	2.0	20.3	-5.9	4.0	8.0
Percentage of Assets	-0.1	-0.4	-0.7	-0.6	-0.8	-0.7	-0.9	-0.9	-0.8	-0.8	-0.7	-1.1	-0.7	0.4	2.9	3.2	0.9	1.4	0.6	2.0	1.2	1.2	3.4	-1.6	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	0.0	0.0	0.0	0.0	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	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2013-12-31	2012-12-31
Value	886	675	657	642	637	573	570	562	551	546	542	499	482	462	447	442	433	417	411	406	398	394	112	103	20	15
Percentage of StockholdersEquity	132.9	128.8	161.6	158.0	163.7	129.7	135.9	140.2	139.7	147.6	141.1	125.8	138.7	150.1	151.7	128.4	126.0	125.5	124.8	122.9	123.5	121.1	205.3	154.1	523.2	-2408.9
Percentage of Assets	40.0	38.3	43.3	41.7	42.5	56.1	58.2	62.3	60.8	63.1	62.4	82.5	84.1	83.5	84.3	76.1	76.2	75.9	74.9	73.4	74.0	74.6	34.0	41.5	0.0	0.0
Percentage of Assets us-gaap:AdditionalPaidInCapital	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:CommonStock

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2013-12-31	2012-12-31
Value	0.126	0.119	0.118	0.119	0.119	0.12	0.12	0.12	0.12	0.12	0.12	0.122	0.121	0.118	0.116	0.116	0.115	0.114	0.113	0.113	0.112	0.112	0.045	0.044	0.033	0.033
Percentage of StockholdersEquity	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.1	0.1	0.8	-5.1
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	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	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2013-12-31	2012-12-31
Value	-217.866	-143.458	-239.883	-227.414	-236.51	-124.015	-142.238	-153.442	-149.707	-169.602	-151.906	-96.29	-130.74	-156.542	-168.211	-116.341	-94.958	-92.559	-85.248	-86.44	-82.208	-75.317	-68.963	-32.377	-17.134	-16.338
Percentage of StockholdersEquity	-32.7	-27.4	-59.0	-55.9	-60.8	-28.0	-33.9	-38.3	-37.9	-45.8	-39.5	-24.3	-37.5	-50.8	-57.0	-33.7	-27.6	-27.8	-25.9	-26.2	-25.5	-23.1	-125.6	-48.3	-428.0	2505.8
Percentage of Assets	-9.8	-8.1	-15.8	-14.7	-15.8	-12.1	-14.5	-17.0	-16.5	-19.6	-17.5	-15.9	-22.8	-28.2	-31.7	-20.0	-16.7	-16.8	-15.5	-15.6	-15.3	-14.2	-20.8	-13.0	0.0	0.0
Percentage of Assets us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Common Stock Value

us-gaap:CommonStockValue

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-04-30
Value	0.126	0.119	0.118	0.119	0.119	0.12	0.12	0.12	0.12	0.12	0.12	0.122	0.121	0.118	0.116	0.116	0.115	0.114	0.113	0.113	0.112	0.112	0.045	0.022	17
Percentage of CommonStockValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	886	675	657	642	637	573	570	562	551	546	542	499	482	462	447	442	433	417	411	406	398	394	112	103
Percentage of AdditionalPaidInCapital	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	40.0	38.3	43.3	41.7	42.5	56.1	58.2	62.3	60.8	63.1	62.4	82.5	84.1	83.5	84.3	76.1	76.2	75.9	74.9	73.4	74.0	74.6	34.0	41.5

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	-217870000.0	-143460000.0	-239880000.0	-227410000.0	-236510000.0	-124020000.0	-142240000.0	-153440000.0	-149710000.0	-169600000.0	-151910000.0	-96290000.0	-130740000.0	-156540000.0	-168210000.0	-116340000.0	-94958000.0	-92559000.0	-85248000.0	-86440000.0	-82208000.0	-75317000.0	-68963000.0	-32377000.0
Percentage of RetainedEarningsAccumulatedDeficit	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	-9.8	-8.1	-15.8	-14.7	-15.8	-12.1	-14.5	-17.0	-16.5	-19.6	-17.5	-15.9	-22.8	-28.2	-31.7	-20.0	-16.7	-16.8	-15.5	-15.6	-15.3	-14.2	-20.8	-13.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	-1.888	-7.699	-10.699	-8.699	-11.523	-7.415	-8.775	-7.813	-7.087	-6.548	-6.281	-6.379	-4.102	2.125	15	18	5.405	7.485	3.458	10	6.251	6.483	11	-3.934
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	-0.1	-0.4	-0.7	-0.6	-0.8	-0.7	-0.9	-0.9	-0.8	-0.8	-0.7	-1.1	-0.7	0.4	2.9	3.2	0.9	1.4	0.6	2.0	1.2	1.2	3.4	-1.6

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

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

Period End	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	2018-06-30	2018-03-31
Value	17	16	13	13	12	11	8.616	13	9.563	9.179	5.99
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	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	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	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	2018-06-30	2018-03-31
Value	17	16	13	13	12	11	8.616	13	9.563	9.179	5.99
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	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	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of Assets us-gaap:AdditionalPaidInCapital	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	185	220	29	78	47	49	31	101	30	40	26	35	16	12	3.309	18	9.206	17	1.786	10	5.375	4.737	8.895	0.101	5.072	0.73	6.184
Percentage of NetCashProvidedByUsedInOperatingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	41.0	51.4	13.0	29.1	23.8	27.5	18.6	50.9	20.4	30.3	21.9	25.8	15.9	11.9	3.4	16.8	10.5	20.2	2.2	11.6	8.2	7.7	15.2	0.2	10.6	1.7	15.3

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	18	16	6.093	-280.118	-160.3	-25.951	-22.004	-41.215	-16.728	-181.797	-45.653	24	8.187	17	12	-23.44	8.316	-5.88	-114.426	-5.148	-6.115	-5.395	-6.625	-3.431	-0.969	-12.321	-4.002
Percentage of NetCashProvidedByUsedInInvestingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	4.2	3.9	2.7	-103.7	-81.0	-14.3	-13.0	-20.6	-11.1	-137.3	-37.8	17.6	7.7	17.0	12.8	-21.3	9.5	-6.9	-139.8	-5.9	-9.3	-8.8	-11.3	-5.3	-2.0	-29.0	-9.9

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	259	-5.825	-32.678	-28.581	428	-11.297	-29.307	-53.019	-8.466	-31.069	236	-3.432	7.489	1.414	-2.032	2.057	3.952	-0.452	0.253	0.565	-0.119	197	1.675	4.222	-0.279	35	5.36
Percentage of NetCashProvidedByUsedInFinancingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	57.4	-1.4	-14.3	-10.6	216.6	-6.2	-17.3	-26.5	-5.6	-23.5	195.6	-2.5	7.0	1.4	-2.1	1.9	4.5	-0.5	0.3	0.6	-0.2	321.8	2.9	6.5	-0.6	84.5	13.2

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31
Value	467	235	-0.939	-228.476	312	13	-21.311	4.258	4.907	-176.035	218	55	33	32	13
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	103.5	54.9	-0.4	-84.6	157.9	7.4	-12.6	2.1	3.3	-133.0	180.6	40.5	31.4	31.5	13.6

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	185	220	29	78	47	49	31	101	30	40	26	35	16	12	3.309	18	9.206	17	1.786	10	5.375	4.737	8.895	0.101	5.072	0.73	6.184
Percentage of NetCashProvidedByUsedInOperatingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	41.0	51.4	13.0	29.1	23.8	27.5	18.6	50.9	20.4	30.3	21.9	25.8	15.9	11.9	3.4	16.8	10.5	20.2	2.2	11.6	8.2	7.7	15.2	0.2	10.6	1.7	15.3

Net Income Loss

us-gaap:NetIncomeLoss

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	91	96	12	31	14	18	31	41	19	3.379	12	44	25	11	-0.421	-21.383	-2.399	-7.311	1.192	-4.232	-6.891	-6.354	-36.586	-5.358	-6.271	-3.151	-0.463
Percentage of NetIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	20.3	22.5	5.5	11.6	7.5	10.1	18.6	20.6	13.2	2.6	10.7	32.8	24.3	11.5	-0.4	-19.4	-2.7	-8.6	1.5	-4.8	-10.5	-10.4	-62.5	-8.3	-13.2	-7.4	-1.1

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31
Value	91	96	12	31	14	18	31	41	19	3.379	12	44	25	11	-0.421	-21.383	-2.399	-7.311	1.192	-4.232	-6.891	-6.354	-36.586
Percentage of NetIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	20.3	22.5	5.5	11.6	7.5	10.1	18.6	20.6	13.2	2.6	10.7	32.8	24.3	11.5	-0.4	-19.4	-2.7	-8.6	1.5	-4.8	-10.5	-10.4	-62.5
Percentage of Revenues us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	15	14	15	15	12	9.81	10	7.626	6.439	6.357	6.32	6.577	7.022	6.66	6.938	6.905	5.786	5.103	4.731	4.509	4.968	4.732	4.341	4.731	4.465	4.132	3.895
Percentage of DepreciationDepletionAndAmortization	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Share Based Compensation

us-gaap:ShareBasedCompensation

Period End	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	2018-06-30	2018-03-31
Value	17	16	13	13	12	10	8.082	14	8.916	8.617	6.454
Percentage of ShareBasedCompensation	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	18	16	6.093	-280.118	-160.3	-25.951	-22.004	-41.215	-16.728	-181.797	-45.653	24	8.187	17	12	-23.44	8.316	-5.88	-114.426	-5.148	-6.115	-5.395	-6.625	-3.431	-0.969	-12.321	-4.002
Percentage of NetCashProvidedByUsedInInvestingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	4.2	3.9	2.7	-103.7	-81.0	-14.3	-13.0	-20.6	-11.1	-137.3	-37.8	17.6	7.7	17.0	12.8	-21.3	9.5	-6.9	-139.8	-5.9	-9.3	-8.8	-11.3	-5.3	-2.0	-29.0	-9.9

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	0.179	-0.358	0.567	1.639	2.142	3.064	0.683	0.577	0.138	0.112	0.192	0.076	0.279	0.893	2.7	1.828	7.875	15	10	1.592	4.98	2.692	1.852	0.423	0.086	0.224	0.571
Percentage of PaymentsToAcquirePropertyPlantAndEquipment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	259	-5.825	-32.678	-28.581	428	-11.297	-29.307	-53.019	-8.466	-31.069	236	-3.432	7.489	1.414	-2.032	2.057	3.952	-0.452	0.253	0.565	-0.119	197	1.675	4.222	-0.279	35	5.36
Percentage of NetCashProvidedByUsedInFinancingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Revenues	57.4	-1.4	-14.3	-10.6	216.6	-6.2	-17.3	-26.5	-5.6	-23.5	195.6	-2.5	7.0	1.4	-2.1	1.9	4.5	-0.5	0.3	0.6	-0.2	321.8	2.9	6.5	-0.6	84.5	13.2

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30
Value	166	0.0	24	22	127	0.0	27	44	0.0	21	68	5.404	2.869	1.231	0.797	0.625	0.453	0.18	0.0	0.0	0.0
Percentage of PaymentsForRepurchaseOfCommonStock	100.0	0.0	100.0	100.0	100.0	0.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	0.0	0.0

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

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31
Value	5.96773	6.437099	6.294919	6.279454	6.336348	6.533151	6.890994	7.115407	7.594641	7.573968	7.947939	9.321232	12	10	9.339567	9.71304	10	11	11	11	13	11
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31
Value	20.4	19.93	19.04	16.26	15.71	15.46	15.23	12.91	12.7	12.61	12.27	11.02	10.96	9.47	8.28	7.89	7.61	7.36	7.18	6.94	5.34	3.1	2.36
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

Period End	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	2018-06-30	2017-12-31	2016-12-31	2016-06-30	2015-12-31	2014-12-31	2013-12-31	2012-12-31
Value	22	21	20	19	20	19	19	18	18	17	17	23	22	22	0.4	0.0	0.0
Percentage of UnrecognizedTaxBenefits	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	0.0

etsy:AdditionalPaidInCapitalCappedCalls

Period End	2020-09-30	2019-09-30
Value	56	58
Percentage of AdditionalPaidInCapitalCappedCalls	100.0	100.0

etsy:AdditionalPaidInCapitalCappedCalls us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2020-09-30	2019-09-30
Value	56	58
Percentage of AdditionalPaidInCapitalCappedCalls	100.0	100.0

etsy:AdditionsToIntangibleAssetsIncludedInOtherCurrentLiabilities

Period End	2020-06-30	2020-03-31	2019-06-30	2019-03-31	2018-06-30	2018-03-31
Value	0	0	372000.0	1348000.0	0	0
Percentage of AdditionsToIntangibleAssetsIncludedInOtherCurrentLiabilities	0.0	0.0	100.0	100.0	0.0	0.0

etsy:AdjustmentToAdditionalPaidinCapitalIncomeTaxEffectFromShareSettlementsOfRestrictedAwardsAndUnitsNet

Period End	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	-6353000.0	-4198000.0	-7448000.0	-10485000.0	-5672000.0	-9238000.0	-6118000.0	-1780000.0
Percentage of AdjustmentToAdditionalPaidinCapitalIncomeTaxEffectFromShareSettlementsOfRestrictedAwardsAndUnitsNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

etsy:AdjustmentToAdditionalPaidinCapitalIncomeTaxEffectFromShareSettlementsOfRestrictedAwardsAndUnitsNet us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	-6353000.0	-4198000.0	-7449000.0	-10485000.0	-5672000.0	-9239000.0	-6118000.0	-1780000.0
Percentage of AdjustmentToAdditionalPaidinCapitalIncomeTaxEffectFromShareSettlementsOfRestrictedAwardsAndUnitsNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

etsy:CapPremiumPercentageOverReportedSalesPrice us-gaap:DebtInstrument, us-gaap:LongtermDebtType

etsy:CapPremiumPercentageOverReportedSalesPrice

etsy:ConvertibleSeniorNotesDue2027, us-gaap:ConvertibleDebt

Period End	2020-08-19
Value	150.0
Percentage of CapPremiumPercentageOverReportedSalesPrice	100.0

etsy:DebtInstrumentConvertibleIfConvertedValueLowerThanPrincipal us-gaap:DebtInstrument, us-gaap:LongtermDebtType

etsy:DebtInstrumentConvertibleIfConvertedValueLowerThanPrincipal

etsy:ConvertibleSeniorNotesDue2027, us-gaap:ConvertibleDebt

Period End	2020-09-30
Value	254
Percentage of DebtInstrumentConvertibleIfConvertedValueLowerThanPrincipal	100.0

etsy:DevelopmentofInternalSoftwareandPropertyandEquipment

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	0.593	0.065	-0.296	-1.193	1.457	1.18	-0.143	-0.309	0.128	1.535	0.838	-0.058	-0.182	0.358	0.877	-8.438	7.834	1.966	11	0.785	-0.564	0.576	1.336	0.658	0.486	0.03
Percentage of DevelopmentofInternalSoftwareandPropertyandEquipment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

etsy:IncreaseDecreaseInOperatingAssetsCurrent

Period End	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	23	49	2.784	-28.153	2.991	48	23	-2.512	4.317
Percentage of IncreaseDecreaseInOperatingAssetsCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

etsy:IncreaseDecreaseInOperatingAssetsNoncurrent

Period End	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	1599000.0	-4079000.0	-915000.0	-802000.0	-1029000.0	-1008000.0	0	-25000.0	-7000.0
Percentage of IncreaseDecreaseInOperatingAssetsNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0

etsy:IncreaseDecreaseInOperatingLiabilitiesCurrent

Period End	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	55	117	-27.235	-23.878	11	25	16	9.221	2.627
Percentage of IncreaseDecreaseInOperatingLiabilitiesCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

etsy:IncreaseDecreaseInOperatingLiabilitiesNoncurrent

Period End	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	2034000.0	-4166000.0	-840000.0	-1171000.0	-2310000.0	-672000.0	433000.0	2150000.0	2095000.0
Percentage of IncreaseDecreaseInOperatingLiabilitiesNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

etsy:NoncashInterestExpense

Period End	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31
Value	9.3	8.456	8.57	3.708	3.416	3.376
Percentage of NoncashInterestExpense	100.0	100.0	100.0	100.0	100.0	100.0

etsy:OffsiteAdsRevenueFeeForEachCompletedTransactionPercent us-gaap:MajorCustomers

etsy:OffsiteAdsRevenueFeeForEachCompletedTransactionPercent

etsy:LevelOne

Period End	2020-09-30	2020-06-30
Value	11.88	0.12
Percentage of OffsiteAdsRevenueFeeForEachCompletedTransactionPercent	100.0	100.0

etsy:LevelTwo

Period End	2020-09-30	2020-06-30
Value	14.85	0.15
Percentage of OffsiteAdsRevenueFeeForEachCompletedTransactionPercent	125.0	125.0

etsy:PurchaseOfCappedCallTransactions us-gaap:DebtInstrument, us-gaap:LongtermDebtType

etsy:PurchaseOfCappedCallTransactions

etsy:ConvertibleSeniorNotesDue2027, us-gaap:ConvertibleDebt

Period End	2020-08-31
Value	74
Percentage of PurchaseOfCappedCallTransactions	100.0

etsy:SharebasedCompensationCapitalizedinDevelopmentofSoftware

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	250000.0	174000.0	139000.0	186000.0	443000.0	534000.0	793000.0	647000.0	562000.0	250000.0	135000.0	147000.0	219000.0	306000.0	296000.0	229000.0	144000.0	123000.0	121000.0	119000.0	160000.0	63000.0	28000.0	54000.0	55000.0	53000.0
Percentage of SharebasedCompensationCapitalizedinDevelopmentofSoftware	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

etsy:StockRepurchasedAndRetiredDuringPeriodValueIncludingBrokerFees

Period End	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	2018-06-30	2018-03-31	2017-12-31
Value	122	0.0	25	22	2.798	0.0	27	45	0.0	21	68	10
Percentage of StockRepurchasedAndRetiredDuringPeriodValueIncludingBrokerFees	100.0	0.0	100.0	100.0	100.0	0.0	100.0	100.0	0.0	100.0	100.0	100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt

Period End	2020-09-30	2019-09-30
Value	102	115
Percentage of AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	100.0	100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt us-gaap:DebtInstrument, us-gaap:LongtermDebtType

etsy:ConvertibleSeniorNotesDue2023, us-gaap:ConvertibleDebt

Period End	2020-09-30
Value	143
Percentage of AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	140.2

us-gaap:AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2020-09-30	2019-09-30
Value	102	115
Percentage of AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	100.0	100.0

us-gaap:BusinessCombinationAcquisitionRelatedCosts us-gaap:BusinessAcquisition

us-gaap:BusinessCombinationAcquisitionRelatedCosts

etsy:ReverbHoldingsInc.

Period End	2020-09-30	2020-06-30	2019-09-30	2019-06-30
Value	400000.0	600000.0	1700000.0	1200000.0
Percentage of BusinessCombinationAcquisitionRelatedCosts	100.0	100.0	100.0	100.0

us-gaap:DebtConversionConvertedInstrumentAmount1 us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtConversionConvertedInstrumentAmount1

etsy:ConvertibleSeniorNotesDue2023, us-gaap:ConvertibleDebt

Period End	2020-09-30
Value	301
Percentage of DebtConversionConvertedInstrumentAmount1	100.0

us-gaap:DebtConversionConvertedInstrumentSharesIssued1 us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtConversionConvertedInstrumentSharesIssued1

etsy:ConvertibleSeniorNotesDue2023, us-gaap:ConvertibleDebt

Period End	2020-09-30
Value	7300000.0
Percentage of DebtConversionConvertedInstrumentSharesIssued1	100.0

us-gaap:DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal

etsy:ConvertibleSeniorNotesDue2023, us-gaap:ConvertibleDebt

Period End	2020-09-30
Value	103
Percentage of DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal	100.0

etsy:ConvertibleSeniorNotesDue2026, us-gaap:ConvertibleDebt

Period End	2020-09-30	2020-06-30
Value	251	137
Percentage of DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal	243.4	0.0

etsy:ConvertibleSeniorNotesdue2023, us-gaap:ConvertibleDebt

Period End	2020-06-30
Value	665
Percentage of DebtInstrumentConvertibleIfConvertedValueInExcessOfPrincipal	0.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31
Value	4268000.0	3925000.0	-4018000.0	1642000.0	-2927000.0	897000.0	-1458000.0	-3301000.0	-519000.0	-3260000.0	1085000.0	-5327000.0	853000.0	1288000.0	-456000.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:FinanceLeasePrincipalPayments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-03-31
Value	2.129	2.361	2.566	2.656	2.702	2.73	2.745	1.85
Percentage of FinanceLeasePrincipalPayments	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	-1.464	1.47	-9.318	4.085	-1.949	-0.192	1.062	-3.514	-0.373	-4.45	1.85	2.153	8.069	16	2.78	-18.022	1.337	-6.386	8.12	-6.048	-0.679	5.805	-20.853	-2.035	-1.014	0.0	0.0
Percentage of ForeignCurrencyTransactionGainLossBeforeTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	0.0

us-gaap:ForeignCurrencyTransactionGainLossUnrealized

Period End	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	2018-06-30	2018-03-31
Value	1.835	-2.237	-8.157	5.733	-1.265	1.069	0.171	-3.28	0.132	-4.951	2.102
Percentage of ForeignCurrencyTransactionGainLossUnrealized	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2015-03-31	2014-03-31
Value	1.634	-10.218	2.829	8.54	4.712	1.854	0.142	18	3.661	0.468	-0.091	24	23	0.0	0.0	80	0.0
Percentage of IncreaseDecreaseInDeferredIncomeTaxes	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	0.0	100.0	0.0

us-gaap:IncrementalCommonSharesAttributableToConversionOfDebtSecurities

Period End	2020-09-30
Value	8623500.0
Percentage of IncrementalCommonSharesAttributableToConversionOfDebtSecurities	100.0

us-gaap:IncrementalCommonSharesAttributableToConversionOfDebtSecurities us-gaap:AwardType

us-gaap:ConvertibleDebtSecurities

Period End	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	9512000.0	0	0	0	4226800.0	3720700.0	900580.0	2004400.0
Percentage of IncrementalCommonSharesAttributableToConversionOfDebtSecurities	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements us-gaap:AwardType

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:RestrictedStock

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30
Value	0	0	-930.0	19360.0	21399.0	17921.0	-3977.0	89702.0	82958.0	59940.0	17109.0	69472.0	25310.0	0	0	0	0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	0.0	0.0	0.0

us-gaap:RestrictedStockUnitsRSU

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30
Value	2425200.0	1750900.0	980690.0	-189640.0	1429300.0	1693100.0	1970900.0	-90715.0	2368400.0	2053900.0	1608900.0	101880.0	1308100.0	844330.0	0	0	0	0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0.0	0.0	0.0	20391.7	7382.8	7912.2	10997.5	2281.0	2640.3	2475.8	2684.1	595.5	1882.9	3336.0	0.0	0.0	0.0	0.0

us-gaap:StockOption

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30
Value	4533400.0	4279300.0	4000200.0	-135680.0	4443400.0	4667800.0	4849200.0	104610.0	4752900.0	3964700.0	2836400.0	-349210.0	2254800.0	2921100.0	0	0	0	0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0.0	0.0	0.0	14588.7	22951.5	21813.4	27059.0	-2630.3	5298.5	4779.2	4732.1	-2041.1	3245.6	11541.2	0.0	0.0	0.0	0.0

us-gaap:InterestOnConvertibleDebtNetOfTax

Period End	2020-09-30	2020-06-30	2019-06-30
Value	4.494	3.969	0.0
Percentage of InterestOnConvertibleDebtNetOfTax	100.0	100.0	0.0

us-gaap:InvestmentIncomeInterestAndDividend

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	1.158	1.732	3.613	3.54	2.883	3.391	3.385	3.055	2.367	2.438	1.097	0.758	0.654	0.543	0.439	0.389	0.402	0.47	0.441	0.207	0.059	0.043	0.015	0.011	0.012	0.014	0.004
Percentage of InvestmentIncomeInterestAndDividend	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent

Period End	2020-09-30	2020-06-30	2019-09-30	2019-06-30	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	6.441	2.538	-3.948	0.982	-0.544	-0.276	0.124	-2.295	-6.267	-13.381	-2.955	13	-2.014	4.011	-7.439	4.569	-0.235	-4.644	15	-1.335	-2.589	-0.145	-0.022
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

Period End	2020-09-30	2020-06-30	2019-09-30	2019-06-30	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	5.811	3.0	-4.108	1.36	-6.227	-13.37	-2.977	13	-2.08	4.027	-7.347	4.554	-0.232	-4.643	15	-1.338	-2.583	-0.148	-0.025
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

Period End	2020-09-30	2020-06-30	2019-09-30	2019-06-30
Value	5.811	3.0	-4.108	1.36
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	-630000.0	462000.0	671000.0	-125000.0	-160000.0	378000.0	99000.0	-23000.0	5000.0	9000.0	-26000.0	18000.0	40000.0	11000.0	-22000.0	-50000.0	-66000.0	16000.0	92000.0	-15000.0	3000.0	1000.0	4000.0	-3000.0	6000.0	-3000.0	-3000.0
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

Period End	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	2018-03-31
Value	-189000.0	142000.0	205000.0	-32000.0	97000.0	0	0	0	0	0
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	100.0	100.0	100.0	100.0	100.0	0.0	0.0	0.0	0.0	0.0

us-gaap:OtherNoncashExpense us-gaap:DebtInstrument

us-gaap:OtherNoncashExpense

etsy:CreditAgreement

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	0.07	0.1	0.1	0.1	0.1	0.1
Percentage of OtherNoncashExpense	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherNoncashExpense us-gaap:DebtInstrument, us-gaap:LongtermDebtType

etsy:ConvertibleSeniorNotesDue2023, us-gaap:ConvertibleDebt

Period End	2020-09-30	2019-09-30
Value	2.58	3.83
Percentage of OtherNoncashExpense	3685.7	3830.0

etsy:ConvertibleSeniorNotesDue2026, us-gaap:ConvertibleDebt

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	5.386	5.3	5.3	5.2	0.4
Percentage of OtherNoncashExpense	7694.3	5300.0	5300.0	5200.0	400.0

etsy:ConvertibleSeniorNotesDue2027, us-gaap:ConvertibleDebt

Period End	2020-09-30
Value	1.952
Percentage of OtherNoncashExpense	2788.6

etsy:ConvertibleSeniorNotesdue2023, us-gaap:ConvertibleDebt

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	4.0	3.9	3.8	3.8	3.8	3.7	3.7	3.7	3.6	1.2
Percentage of OtherNoncashExpense	4000.0	3900.0	3800.0	3800.0	3800.0	0.0	0.0	0.0	0.0	0.0

us-gaap:OtherNoncashExpense us-gaap:LongtermDebtType

us-gaap:ConvertibleDebt

Period End	2020-09-30	2019-09-30
Value	9.918	4.23
Percentage of OtherNoncashExpense	14168.6	4230.0

us-gaap:OtherNoncashIncomeExpense

Period End	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31
Value	-1.386	-1.315	-0.53	0.186	0.03	0.448
Percentage of OtherNoncashIncomeExpense	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30
Value	0	0	0	0	-9000.0	-15000.0	-20000.0	-10000.0	-3000.0	-13000.0	-43000.0	-25000.0	-17000.0	0	0	0	0
Percentage of ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	0.0	0.0	0.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	0.0	0.0	0.0

us-gaap:PaymentsOfDebtIssuanceCosts

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31
Value	9.75	0.0	0.014	0.762	9.75	0.2	1.192	0.0	0.401	0.434	9.127	0.0	0.0	0.0	0.0
Percentage of PaymentsOfDebtIssuanceCosts	100.0	0.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	0.0	0.0	0.0	0.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

Period End	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	2018-06-30	2018-03-31
Value	9.26	6.353	4.198	8.942	7.448	10	5.672	6.929	9.238	6.118	1.78
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PaymentsToAcquireAvailableForSaleSecuritiesDebt

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	119	79	101	343	12	146	158	155	125	174	59	15	17	6.222	23	51	0.436	-0.073	108	7.488	5.316	7.836	5.4	4.489	1.913	6.034	9.262
Percentage of PaymentsToAcquireAvailableForSaleSecuritiesDebt	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PaymentsToDevelopSoftware

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	1.642	0.782	1.261	1.508	1.573	1.279	3.39	5.863	5.528	5.049	3.097	1.166	1.438	2.648	3.956	3.328	2.83	3.443	2.168	2.39	2.206	2.695	2.428	2.261	1.986	1.798	2.235
Percentage of PaymentsToDevelopSoftware	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ProceedsFromDebtNetOfIssuanceCosts us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:ProceedsFromDebtNetOfIssuanceCosts

etsy:ConvertibleSeniorNotesDue2027, us-gaap:ConvertibleDebt

Period End	2020-08-31
Value	639
Percentage of ProceedsFromDebtNetOfIssuanceCosts	100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

Period End	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	2018-06-30	2018-03-31
Value	1928000.0	-4392000.0	-5804000.0	5117000.0	1076000.0	208000.0	1864000.0	-4105000.0	2954000.0	3747000.0	-2724000.0
Percentage of ProceedsFromPaymentsForOtherFinancingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities

Period End	2020-09-30	2019-09-30
Value	140	129
Percentage of ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	100.0	100.0

us-gaap:ProceedsFromSaleMaturityAndCollectionsOfInvestments

Period End	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	109	65	129	124	140	120	113	33	17
Percentage of ProceedsFromSaleMaturityAndCollectionsOfInvestments	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ProceedsFromStockOptionsExercised

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	6.309	7.281	4.896	0.857	1.094	1.91	5.93	2.68	4.848	0.476	10	11	15	5.776	0.6	2.76	4.914	1.671	1.223	1.341	0.227	0.87	1.188	0.371	0.558	1.269	5.758
Percentage of ProceedsFromStockOptionsExercised	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ProvisionForDoubtfulAccounts

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	3.668	2.22	3.684	3.499	3.318	2.964	1.182	0.507	1.656	1.049	0.912	0.438	1.196	0.531	0.332	0.555	0.534	0.34	0.341	0.307	-0.169	0.875	0.767	0.844	0.526	0.173	0.338
Percentage of ProvisionForDoubtfulAccounts	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RepaymentsOfConvertibleDebt us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:RepaymentsOfConvertibleDebt

etsy:ConvertibleSeniorNotesDue2023, us-gaap:ConvertibleDebt

Period End	2020-09-30
Value	137
Percentage of RepaymentsOfConvertibleDebt	100.0

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability

Period End	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-03-31
Value	271000.0	235000.0	135000.0	324000.0	131000.0	202000.0	29000.0
Percentage of RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate

us-gaap:EmployeeStockOption

Period End	2020-09-30	2020-03-31	2019-09-30	2019-03-31	2018-09-30
Value	41.7	0.395	0.392	0.395	0.478
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	100.0	100.0	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate us-gaap:Range, us-gaap:AwardType

srt:Maximum, us-gaap:EmployeeStockOption

Period End	2020-09-30	2020-06-30	2019-09-30	2019-06-30
Value	41.283	0.417	39.105	0.395
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	99.0	0.0	9975.8	0.0

srt:Minimum, us-gaap:EmployeeStockOption

Period End	2020-09-30	2020-06-30	2019-09-30	2019-06-30
Value	38.511	0.413	38.808	0.392
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	92.4	0.0	9900.0	0.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

us-gaap:EmployeeStockOption

Period End	2020-09-30	2019-09-30	2018-09-30
Value	0.3	0.019	0.028
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate us-gaap:Range, us-gaap:AwardType

srt:Maximum, us-gaap:EmployeeStockOption

Period End	2020-09-30	2020-06-30	2019-09-30	2019-06-30
Value	1.683	0.005	2.375	0.024
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	561.0	0.0	12500.0	0.0

srt:Minimum, us-gaap:EmployeeStockOption

Period End	2020-09-30	2020-06-30	2019-09-30	2019-06-30
Value	0.296	0.004	1.881	0.019
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	98.7	0.0	9900.0	0.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31
Value	42	32	20	2.075	3.787	8.373	28	9.578	13	1.397	9.799	8.466	31	11	1.732	4.890794	8.129031	3.722306	2.4	3.056977	1.36374	3.961415	6.7
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30
Value	50.68	28.97	16.68	-1.77	25.4	25.0	29.55	-2.2	25.0	13.51	12.31	0.02	6.5	4.73	4.66	0.14	4.84	4.09	3.69	-0.18	6.7	6.95
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31
Value	8.855	19	7.385	16	7.047	12	6.083	9.535	8.783	11	2.93	3.398	5.943	6.695	3.79	1.621623	1.702647	2.87312	3.3	2.475289	2.23182	1.543309	2.1
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:StockIssuedDuringPeriodSharesRestrictedStockAwardGross us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesRestrictedStockAwardGross

us-gaap:CommonStock

Period End	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	253740.0	129230.0	173660.0	247940.0	159400.0	292050.0	253990.0	104850.0
Percentage of StockIssuedDuringPeriodSharesRestrictedStockAwardGross	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31
Value	510110.0	447890.0	66555.0	85390.0	154200.0	534690.0	233890.0	407240.0	59736.0	887910.0	1161100.0	3006900.0	1384400.0	207970.0	574380.0	925280.0	589570.0	446400.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:CommonStock

Period End	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31
Value	510110.0	447890.0	85390.0	154200.0	534690.0	233890.0	407240.0	59736.0	887910.0	1161100.0	3006900.0	1384400.0	207970.0	574380.0	925280.0	589570.0	446400.0
Percentage of StockIssuedDuringPeriodSharesStockOptionsExercised	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:StockIssuedDuringPeriodValueConversionOfConvertibleSecurities

Period End	2020-09-30	2015-12-31	2015-09-30
Value	151	0.0	0.0
Percentage of StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	100.0	0.0	0.0

us-gaap:StockIssuedDuringPeriodValueConversionOfConvertibleSecurities us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2020-09-30	2015-12-31	2015-09-30
Value	151	0.0	0.0
Percentage of StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	100.0	0.0	0.0

us-gaap:CommonStock

Period End	2020-09-30	2015-12-31	2015-09-30
Value	0.007	0.0	0.0
Percentage of StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	0.0	0.0	0.0

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures

Period End	2020-09-30	2019-09-30
Value	-9260000.0	-7448000.0
Percentage of StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	100.0	100.0

us-gaap:StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2020-09-30	2019-09-30
Value	-9261000.0	-7449000.0
Percentage of StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	100.0	100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31
Value	6.309	7.281	4.896	0.857	1.094	1.91	5.93	2.68	4.848	0.476	10	11	15	5.776	0.6	2.76	4.914	1.671	1.223	1.341	0.226	0.871	1.188
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:StockIssuedDuringPeriodValueStockOptionsExercised us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31
Value	6.309	7.28	4.896	0.857	1.094	1.91	5.929	2.68	4.848	0.476	10	11	15	5.774	0.6	2.759	4.913	1.67	1.223	1.34	0.226	0.871	1.187
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	99.9	100.0	99.9	100.0	100.0	99.9

us-gaap:CommonStock

Period End	2020-09-30	2020-06-30	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2015-12-31	2015-09-30	2015-06-30	2015-03-31
Value	0.0	0.001	0.0	0.0	0.0	0.001	0.0	0.0	0.0	0.001	0.001	0.003	0.002	0.0	0.001	0.001	0.001	0.0	0.0	0.001
Percentage of StockIssuedDuringPeriodValueStockOptionsExercised	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.1	0.0	0.0	0.1

us-gaap:StockRepurchasedAndRetiredDuringPeriodShares

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-11-17	2017-12-31
Value	0	543110.0	425080.0	50721.0	0	532410.0	916080.0	0	722940.0	2807400.0	0	586230.0
Percentage of StockRepurchasedAndRetiredDuringPeriodShares	0.0	100.0	100.0	100.0	0.0	100.0	100.0	0.0	100.0	100.0	100.0	0.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodShares us-gaap:DebtInstrument, us-gaap:LongtermDebtType

etsy:ConvertibleSeniorNotesDue2023, us-gaap:ConvertibleDebt

Period End	2020-08-31
Value	1300000.0
Percentage of StockRepurchasedAndRetiredDuringPeriodShares	0.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodShares us-gaap:StatementEquityComponents

us-gaap:CommonStock

Period End	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	0	543110.0	2144900.0	0	532410.0	916080.0	0	722940.0	2807400.0
Percentage of StockRepurchasedAndRetiredDuringPeriodShares	0.0	100.0	4228.9	0.0	100.0	100.0	0.0	100.0	100.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-11-17
Value	166	0.0	24	22	127	0.0	27	45	0.0	21	68	10	0.0
Percentage of StockRepurchasedAndRetiredDuringPeriodValue	100.0	0.0	100.0	100.0	100.0	0.0	100.0	100.0	0.0	100.0	100.0	100.0	0.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue us-gaap:DebtInstrument, us-gaap:LongtermDebtType

etsy:ConvertibleSeniorNotesDue2023, us-gaap:ConvertibleDebt

Period End	2020-08-31
Value	166
Percentage of StockRepurchasedAndRetiredDuringPeriodValue	0.0

us-gaap:StockRepurchasedAndRetiredDuringPeriodValue us-gaap:StatementEquityComponents

us-gaap:CommonStock

Period End	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	2018-06-30	2018-03-31
Value	0.001	0.0	0.001	0.0	0.002	0.0	0.001	0.0	0.001	0.0	0.003
Percentage of StockRepurchasedAndRetiredDuringPeriodValue	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	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	166	0.0	24	22	127	0.0	27	44	-0.001	21	68
Percentage of StockRepurchasedAndRetiredDuringPeriodValue	100.0	0.0	100.0	100.0	100.0	0.0	100.0	100.0	0.0	99.8	100.0

us-gaap:TreasuryStockAcquiredAverageCostPerShare

Period End	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	2018-06-30	2018-03-31	2017-11-17	2017-12-31
Value	49.63	0	46.02	52.21	55160.0	0	51.64	49.11	0	29.15	24.43	0	17.57
Percentage of TreasuryStockAcquiredAverageCostPerShare	100.0	0.0	100.0	100.0	100.0	0.0	100.0	100.0	0.0	100.0	100.0	100.0	0.0

us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-03-31
Value	0	0	0	0	9000.0	15000.0	20000.0	10000.0	3000.0	13000.0	43000.0	25000.0	17000.0	0	0	0	0	7000.0	0
Percentage of UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	0.0	0.0	0.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	0.0	0.0	0.0	100.0	0.0

etsy:DebtInstrumentConvertibleIfconvertedValue us-gaap:DebtInstrument, us-gaap:LongtermDebtType

etsy:DebtInstrumentConvertibleIfconvertedValue

etsy:ConvertibleSeniorNotesDue2026, us-gaap:ConvertibleDebt

Period End	2020-06-30	2020-03-31
Value	787	284
Percentage of DebtInstrumentConvertibleIfconvertedValue	100.0	100.0

etsy:ConvertibleSeniorNotesdue2023, us-gaap:ConvertibleDebt

Period End	2020-06-30	2020-03-31
Value	1000	365
Percentage of DebtInstrumentConvertibleIfconvertedValue	127.0	128.3

etsy:FundsPayableAndAmountsDueToSellersCurrent

Period End	2020-09-30	2019-12-31
Value	113	49
Percentage of FundsPayableAndAmountsDueToSellersCurrent	100.0	100.0

etsy:FundsPayableandAmountsDuetoSellersCurrent

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	103	55	49	37	64	64	21	63	49	48	44	45	35	34	29	34	22	25	19	17	10	12	10
Percentage of FundsPayableandAmountsDuetoSellersCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

etsy:FundsReceivableAndSellerAccountsCurrent

Period End	2020-09-30	2019-12-31
Value	113	49
Percentage of FundsReceivableAndSellerAccountsCurrent	100.0	100.0

etsy:FundsReceivableAndSellerAccountsFairValue us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

etsy:FundsReceivableAndSellerAccountsFairValue

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring

Period End	2020-09-30	2019-12-31
Value	43	18
Percentage of FundsReceivableAndSellerAccountsFairValue	100.0	100.0

etsy:FundsReceivableAndSellerAccountsFairValue us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:MoneyMarketFunds

Period End	2020-09-30	2019-12-31
Value	43	18
Percentage of FundsReceivableAndSellerAccountsFairValue	100.0	100.0

etsy:FundsReceivableAndSellerAccountsFairValue us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring

Period End	2020-09-30	2019-12-31
Value	43	18
Percentage of FundsReceivableAndSellerAccountsFairValue	100.0	100.0

etsy:FundsReceivableAndSellerAccountsFairValue us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, us-gaap:MoneyMarketFunds

Period End	2020-09-30	2019-12-31
Value	43	18
Percentage of FundsReceivableAndSellerAccountsFairValue	100.0	100.0

etsy:FundsReceivableandSellerAccountsCurrent

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	103	55	49	37	64	64	21	63	49	48	44	45	35	34	29	34	22	25	19	17	10	12	10
Percentage of FundsReceivableandSellerAccountsCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

etsy:FundsReceivableandSellerAccountsFairValue us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

etsy:FundsReceivableandSellerAccountsFairValue

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2017-12-31
Value	35	19	18	7.906	20	24	9.229	14
Percentage of FundsReceivableandSellerAccountsFairValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

etsy:FundsReceivableandSellerAccountsFairValue us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:MoneyMarketFunds

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31
Value	35	19	18	7.906	20	24	9.229
Percentage of FundsReceivableandSellerAccountsFairValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0

etsy:FundsReceivableandSellerAccountsFairValue us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2017-12-31
Value	35	19	18	7.906	20	24	9.229	14
Percentage of FundsReceivableandSellerAccountsFairValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

etsy:FundsReceivableandSellerAccountsFairValue us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, us-gaap:MoneyMarketFunds

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31
Value	35	19	18	7.906	20	24	9.229
Percentage of FundsReceivableandSellerAccountsFairValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0

etsy:PropertyPlantAndEquipmentAndFinanceLeaseRightofUseAssetAfterAccumulatedDepreciationAndAmortization

Period End	2020-03-31	2019-12-31
Value	134	144
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightofUseAssetAfterAccumulatedDepreciationAndAmortization	100.0	100.0

etsy:TransactionPriceCap us-gaap:DebtInstrument, us-gaap:LongtermDebtType

etsy:TransactionPriceCap

etsy:ConvertibleSeniorNotesDue2027, us-gaap:ConvertibleDebt

Period End	2020-08-31
Value	327.83
Percentage of TransactionPriceCap	100.0

etsy:VendorAccrual

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2017-12-31
Value	69	46	24	25	20	20	14	17	14
Percentage of VendorAccrual	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AccruedBonusesCurrentAndNoncurrent

Period End	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2017-12-31
Value	6.209	19	14	11	5.651	12	4.364
Percentage of AccruedBonusesCurrentAndNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	7392000.0	6182000.0	6734000.0	5033000.0	5291000.0	2868000.0	5822000.0	4720000.0	4641000.0	3568000.0	3075000.0	2687000.0	2851000.0	2278000.0	1891000.0	1999000.0	1997000.0	1772000.0	1920000.0	2071000.0	2402000.0	2706000.0	2306000.0	1841000.0
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

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

us-gaap:AssetsFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2017-12-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	1227	903	596	497	614	404	366	316	253	150	138	132	136	234	41	41	41	41
Percentage of AssetsFairValueDisclosure	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2017-12-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	93	121	185	221	120	188	187	202	27	53	56	76	82	0.0	0.0	0.0	0.0	0.0
Percentage of AssetsFairValueDisclosure	7.7	13.4	31.2	44.6	19.6	46.6	51.1	63.9	10.7	35.6	41.0	57.4	60.2	0.0	0.0	0.0	0.0	0.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2017-12-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	1321	1024	782	719	734	592	554	519	280	203	194	208	218	234	41	41	41	41
Percentage of AssetsFairValueDisclosure	107.7	113.4	131.2	144.6	119.6	146.6	151.1	163.9	110.7	135.6	141.0	157.4	160.2	100.0	100.0	100.0	100.0	100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax

Period End	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	2018-06-30	2017-12-31
Value	877000.0	1714000.0	2018000.0	286000.0	371000.0	434000.0	57000.0	12000.0	14000.0	12000.0	11000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:CertificatesOfDeposit, etsy:LongTermInvestments

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	0	0	2000.0	0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	0.0	0.0	0.7	0.0

us-gaap:CertificatesOfDeposit, us-gaap:ShortTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	15000.0	60000.0	45000.0	6000.0	0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	1.7	3.5	2.2	2.1	0.0

us-gaap:CommercialPaper, us-gaap:CashAndCashEquivalents

Period End	2020-03-31	2019-12-31	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31
Value	1000.0	0	0	0	0	0	0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:CommercialPaper, us-gaap:ShortTermInvestments

Period End	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	2018-06-30	2017-12-31
Value	23000.0	56000.0	32000.0	2000.0	25000.0	0	0	0	0	0	0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	2.6	3.3	1.6	0.7	6.7	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:CorporateBondSecurities, etsy:LongTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	34000.0	57000.0	2000.0	16000.0	3000.0	142000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	3.9	3.3	0.1	5.6	0.8	32.7

us-gaap:CorporateBondSecurities, us-gaap:ShortTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	243000.0	424000.0	25000.0	156000.0	242000.0	146000.0	0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	27.7	24.7	1.2	54.5	65.2	33.6	0.0

us-gaap:USGovernmentAgenciesDebtSecurities, etsy:LongTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	203000.0	240000.0	461000.0	36000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	23.1	14.0	22.8	12.6

us-gaap:USGovernmentAgenciesDebtSecurities, us-gaap:ShortTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2018-12-31
Value	359000.0	877000.0	1452000.0	67000.0	12000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	40.9	51.2	72.0	23.4	100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax us-gaap:InvestmentType

etsy:LongTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	237000.0	297000.0	463000.0	54000.0	9000.0	142000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	27.0	17.3	22.9	18.9	2.4	32.7

us-gaap:CashAndCashEquivalents

Period End	2020-03-31	2019-12-31	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31
Value	1000.0	1000.0	0	0	0	0	0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	0.0	0.3	0.0	0.0	0.0	0.0	0.0

us-gaap:ShortTermInvestments

Period End	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	2018-06-30	2017-12-31
Value	640000.0	1417000.0	1554000.0	231000.0	362000.0	292000.0	57000.0	12000.0	14000.0	12000.0	11000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	73.0	82.7	77.0	80.8	97.6	67.3	100.0	100.0	100.0	100.0	100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax

Period End	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	2018-06-30	2017-12-31
Value	2000.0	21000.0	930000.0	71000.0	0	0	2000.0	44000.0	23000.0	26000.0	8000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	100.0	100.0	100.0	100.0	0.0	0.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:CertificatesOfDeposit, etsy:LongTermInvestments

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	1000.0	43000.0	0	0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	4.8	4.6	0.0	0.0

us-gaap:CertificatesOfDeposit, us-gaap:ShortTermInvestments

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	0	25000.0	3000.0	0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	0.0	2.7	4.2	0.0

us-gaap:CommercialPaper, us-gaap:CashAndCashEquivalents

Period End	2020-03-31	2019-12-31	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31
Value	2000.0	0	0	0	0	0	0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	0.2	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:CommercialPaper, us-gaap:ShortTermInvestments

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31
Value	0	12000.0	1000.0	0	0	0	0	0	0	0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	0.0	1.3	1.4	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:CorporateBondSecurities, etsy:LongTermInvestments

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	19000.0	397000.0	35000.0	0	0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	90.5	42.7	49.3	0.0	0.0

us-gaap:CorporateBondSecurities, us-gaap:ShortTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	2000.0	1000.0	439000.0	22000.0	0	0	35000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	100.0	4.8	47.2	31.0	0.0	0.0	79.5

us-gaap:USGovernmentAgenciesDebtSecurities, etsy:LongTermInvestments

Period End	2020-06-30	2020-03-31	2019-12-31
Value	0	12000.0	2000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	0.0	1.3	2.8

us-gaap:USGovernmentAgenciesDebtSecurities, us-gaap:ShortTermInvestments

Period End	2020-06-30	2020-03-31	2019-12-31	2018-12-31
Value	0	0	8000.0	9000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	0.0	0.0	11.3	20.5

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax us-gaap:InvestmentType

etsy:LongTermInvestments

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	20000.0	452000.0	37000.0	0	0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	95.2	48.6	52.1	0.0	0.0

us-gaap:CashAndCashEquivalents

Period End	2020-03-31	2019-12-31	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31
Value	2000.0	0	0	0	0	0	1000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	0.2	0.0	0.0	0.0	0.0	0.0	12.5

us-gaap:ShortTermInvestments

Period End	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	2018-06-30	2017-12-31
Value	2000.0	1000.0	476000.0	34000.0	0	0	2000.0	44000.0	23000.0	26000.0	7000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	100.0	4.8	51.2	47.9	0.0	0.0	100.0	100.0	100.0	100.0	87.5

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis

Period End	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	2018-06-30	2017-12-31
Value	415	437	460	471	184	299	297	265	224	235	61
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:CertificatesOfDeposit, etsy:LongTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	2.04	2.041	2.044	4.727	1.03
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis	0.5	0.5	0.4	1.0	0.6

us-gaap:CertificatesOfDeposit, us-gaap:ShortTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	14	14	23	26	4.526
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis	3.6	3.4	5.2	5.5	2.5

us-gaap:CommercialPaper, us-gaap:CashAndCashEquivalents

Period End	2020-03-31	2019-12-31	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31
Value	6.292	5.794	12	7.775	2.994	25	11
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis	1.4	1.2	4.4	2.9	1.3	11.0	18.4

us-gaap:CommercialPaper, us-gaap:ShortTermInvestments

Period End	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	2018-06-30	2017-12-31
Value	8.674	8.634	26	29	41	79	117	147	125	110	2.998
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis	2.1	2.0	5.7	6.2	22.7	26.4	39.5	55.8	56.1	47.1	4.9

us-gaap:CorporateBondSecurities, etsy:LongTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	8.0	13	17	38	0.687	25
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis	1.9	3.1	3.7	8.2	0.4	8.4

us-gaap:CorporateBondSecurities, us-gaap:ShortTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	59	81	111	114	77	83	46
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis	14.4	18.6	24.2	24.2	41.9	28.0	17.7

us-gaap:USGovernmentAgenciesDebtSecurities, etsy:LongTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	26	57	74	46
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis	6.4	13.1	16.3	9.8

us-gaap:USGovernmentAgenciesDebtSecurities, us-gaap:ShortTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2018-12-31
Value	295	259	199	204	62
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis	71.1	59.3	43.2	43.3	23.6

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis us-gaap:InvestmentType

etsy:LongTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	36	72	94	89	4.756	25
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis	8.8	16.7	20.4	18.9	2.6	8.4

us-gaap:CashAndCashEquivalents

Period End	2020-03-31	2019-12-31	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31
Value	6.292	8.752	21	7.775	2.994	25	36
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis	1.4	1.9	7.2	2.9	1.3	11.0	59.1

us-gaap:ShortTermInvestments

Period End	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	2018-06-30	2017-12-31
Value	378	364	360	373	179	274	276	257	221	209	25
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis	91.2	83.3	78.2	79.2	97.4	91.6	92.8	97.1	98.7	89.0	40.9

us-gaap:AvailableForSaleSecuritiesDebtSecurities

Period End	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	2018-06-30	2017-12-31
Value	416	438	462	472	184	300	297	265	224	235	61
Percentage of AvailableForSaleSecuritiesDebtSecurities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:CertificatesOfDeposit, etsy:LongTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	2.04	2.04	2.001	4.729	1.03
Percentage of AvailableForSaleSecuritiesDebtSecurities	0.5	0.5	0.4	1.0	0.6

us-gaap:CertificatesOfDeposit, us-gaap:ShortTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	14	14	23	26	4.526
Percentage of AvailableForSaleSecuritiesDebtSecurities	3.6	3.4	5.2	5.5	2.4

us-gaap:CommercialPaper, us-gaap:CashAndCashEquivalents

Period End	2020-03-31	2019-12-31	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31
Value	6.291	5.794	12	7.775	2.994	25	11
Percentage of AvailableForSaleSecuritiesDebtSecurities	1.4	1.2	4.4	2.9	1.3	11.0	18.4

us-gaap:CommercialPaper, us-gaap:ShortTermInvestments

Period End	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	2018-06-30	2017-12-31
Value	8.697	8.69	26	29	42	79	117	147	125	110	2.998
Percentage of AvailableForSaleSecuritiesDebtSecurities	2.1	2.0	5.6	6.2	22.7	26.3	39.5	55.8	56.1	47.1	4.9

us-gaap:CorporateBondSecurities, etsy:LongTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	8.034	13	16	38	0.69	25
Percentage of AvailableForSaleSecuritiesDebtSecurities	1.9	3.1	3.6	8.2	0.4	8.5

us-gaap:CorporateBondSecurities, us-gaap:ShortTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31
Value	60	81	110	114	77	83	46
Percentage of AvailableForSaleSecuritiesDebtSecurities	14.5	18.7	24.0	24.2	42.0	28.0	17.7

us-gaap:USGovernmentAgenciesDebtSecurities, etsy:LongTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	26	57	75	46
Percentage of AvailableForSaleSecuritiesDebtSecurities	6.4	13.1	16.3	9.8

us-gaap:USGovernmentAgenciesDebtSecurities, us-gaap:ShortTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2018-12-31
Value	295	260	200	204	62
Percentage of AvailableForSaleSecuritiesDebtSecurities	71.0	59.3	43.4	43.3	23.6

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:InvestmentType

etsy:LongTermInvestments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30
Value	36	73	94	89	4.765	25
Percentage of AvailableForSaleSecuritiesDebtSecurities	8.8	16.7	20.4	18.9	2.6	8.5

us-gaap:CashAndCashEquivalents

Period End	2020-03-31	2019-12-31	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31
Value	6.291	8.753	21	7.775	2.994	25	36
Percentage of AvailableForSaleSecuritiesDebtSecurities	1.4	1.9	7.2	2.9	1.3	11.0	59.1

us-gaap:ShortTermInvestments

Period End	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	2018-06-30	2017-12-31
Value	379	365	361	373	180	274	276	257	221	209	25
Percentage of AvailableForSaleSecuritiesDebtSecurities	91.2	83.3	78.3	79.2	97.4	91.5	92.8	97.1	98.7	89.0	40.9

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	379	365	361	373	180	274	276	257	221	209	67	25	50	60	81	100	82	110	111	21	20	21	21	19
Percentage of AvailableForSaleSecuritiesDebtSecuritiesCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2018-12-31
Value	295	260	200	204	60	62
Percentage of AvailableForSaleSecuritiesDebtSecuritiesCurrent	77.9	71.1	55.5	54.6	33.6	24.3

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2018-12-31
Value	83	105	160	169	119	194
Percentage of AvailableForSaleSecuritiesDebtSecuritiesCurrent	22.1	28.9	44.5	45.4	66.4	75.7

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:CertificatesOfDeposit

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	0.0	0.0	0.0	4.526
Percentage of AvailableForSaleSecuritiesDebtSecuritiesCurrent	0.0	0.0	0.0	2.5

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:USGovernmentAgenciesDebtSecurities

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2018-12-31
Value	295	260	200	204	62
Percentage of AvailableForSaleSecuritiesDebtSecuritiesCurrent	77.9	71.1	55.5	54.6	24.3

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CertificatesOfDeposit

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	14	14	23	26	0.0
Percentage of AvailableForSaleSecuritiesDebtSecuritiesCurrent	4.0	4.1	6.6	7.0	0.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CommercialPaper

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2018-12-31
Value	8.697	8.69	26	29	42	147
Percentage of AvailableForSaleSecuritiesDebtSecuritiesCurrent	2.3	2.4	7.2	7.8	23.3	57.5

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateBondSecurities

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2018-12-31
Value	60	81	110	114	77	46
Percentage of AvailableForSaleSecuritiesDebtSecuritiesCurrent	15.8	22.4	30.7	30.5	43.1	18.2

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2018-12-31
Value	379	365	361	373	180	257
Percentage of AvailableForSaleSecuritiesDebtSecuritiesCurrent	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesCurrent us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, us-gaap:CertificatesOfDeposit

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	14	14	23	26	4.526
Percentage of AvailableForSaleSecuritiesDebtSecuritiesCurrent	4.0	4.1	6.6	7.0	2.5

us-gaap:FairValueMeasurementsRecurring, us-gaap:CommercialPaper

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2018-12-31
Value	8.697	8.69	26	29	42	147
Percentage of AvailableForSaleSecuritiesDebtSecuritiesCurrent	2.3	2.4	7.2	7.8	23.3	57.5

us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateBondSecurities

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2018-12-31
Value	60	81	110	114	77	46
Percentage of AvailableForSaleSecuritiesDebtSecuritiesCurrent	15.8	22.4	30.7	30.5	43.1	18.2

us-gaap:FairValueMeasurementsRecurring, us-gaap:USGovernmentAgenciesDebtSecurities

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2018-12-31
Value	295	260	200	204	62
Percentage of AvailableForSaleSecuritiesDebtSecuritiesCurrent	77.9	71.1	55.5	54.6	24.3

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2018-12-31
Value	36	73	94	89	4.765	0.0
Percentage of AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	100.0	100.0	100.0	100.0	100.0	0.0

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	26	57	75	46	4.075
Percentage of AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	72.5	78.3	80.2	51.5	85.5

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	10	15	18	43	0.69
Percentage of AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	27.5	21.7	19.8	48.5	14.5

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:CertificatesOfDeposit

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	0.0	0.0	0.0	1.03
Percentage of AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	0.0	0.0	0.0	21.6

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:USGovernmentAgenciesDebtSecurities

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	26	57	75	46
Percentage of AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	72.5	78.3	80.2	51.5

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CertificatesOfDeposit

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	2.04	2.04	2.001	4.729	0.0
Percentage of AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	5.6	2.8	2.1	5.3	0.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateBondSecurities

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	8.034	13	16	38	0.69
Percentage of AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	21.9	18.9	17.7	43.2	14.5

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	36	73	94	89	4.765
Percentage of AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	100.0	100.0	100.0	100.0	100.0

us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, us-gaap:CertificatesOfDeposit

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	2.04	2.04	2.001	4.729	1.03
Percentage of AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	5.6	2.8	2.1	5.3	21.6

us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateBondSecurities

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	8.034	13	16	38	0.69
Percentage of AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	21.9	18.9	17.7	43.2	14.5

us-gaap:FairValueMeasurementsRecurring, us-gaap:USGovernmentAgenciesDebtSecurities

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	26	57	75	46
Percentage of AvailableForSaleSecuritiesDebtSecuritiesNoncurrent	72.5	78.3	80.2	51.5

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

us-gaap:CashAndCashEquivalentsFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	861	550	300	228	541	272	232	244	186	233	444	229	133	108	102	100	112	97	94	212	20	19	20	22
Percentage of CashAndCashEquivalentsFairValueDisclosure	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	0.0	6.291	8.753	0.0	0.0	21	7.775	2.994	25	6.987	11	50	32	16	2.997	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0
Percentage of CashAndCashEquivalentsFairValueDisclosure	0.0	2.1	3.8	0.0	0.0	9.3	3.2	1.6	11.1	1.6	4.9	37.7	29.9	16.0	3.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

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

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, us-gaap:MoneyMarketFunds

Period End	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	2018-06-30	2017-12-31
Value	861	550	300	228	541	272	232	244	186	233	204
Percentage of CashAndCashEquivalentsFairValueDisclosure	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	89.1

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CommercialPaper

Period End	2020-03-31	2019-12-31	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31
Value	6.291	5.794	12	7.775	2.994	25	11
Percentage of CashAndCashEquivalentsFairValueDisclosure	2.1	2.5	5.6	3.2	1.6	11.1	4.9

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31
Value	861	550	306	237	541	272	253	252	189	259	451	241	184	141	118	103	112	97	94	212	20	19	20	22
Percentage of CashAndCashEquivalentsFairValueDisclosure	100.0	100.0	102.1	103.8	100.0	100.0	109.3	103.2	101.6	111.1	101.6	104.9	137.7	129.9	116.0	103.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:CashAndCashEquivalentsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueMeasurementsRecurring, us-gaap:CommercialPaper

Period End	2020-03-31	2019-12-31	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31
Value	6.291	5.794	12	7.775	2.994	25	11
Percentage of CashAndCashEquivalentsFairValueDisclosure	2.1	2.5	5.6	3.2	1.6	11.1	4.9

us-gaap:FairValueMeasurementsRecurring, us-gaap:MoneyMarketFunds

Period End	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	2018-06-30	2017-12-31
Value	861	550	300	228	541	272	232	244	186	233	204
Percentage of CashAndCashEquivalentsFairValueDisclosure	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	89.1

us-gaap:DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent

etsy:ConvertibleSeniorNotesDue2023, us-gaap:ConvertibleDebt

Period End	2020-09-30	2019-12-31
Value	9.3	72
Percentage of DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent	100.0	100.0

etsy:ConvertibleSeniorNotesDue2027, us-gaap:ConvertibleDebt

Period End	2020-09-30
Value	136
Percentage of DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent	1466.7

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

us-gaap:DebtInstrumentFaceAmount

etsy:ConvertibleSeniorNotesDue2023, us-gaap:ConvertibleDebt

Period End	2020-09-30	2019-12-31
Value	43	345
Percentage of DebtInstrumentFaceAmount	100.0	100.0

etsy:ConvertibleSeniorNotesDue2027, us-gaap:ConvertibleDebt

Period End	2020-09-30
Value	650
Percentage of DebtInstrumentFaceAmount	1480.6

us-gaap:DebtInstrumentFaceAmount us-gaap:LongtermDebtType

us-gaap:ConvertibleDebt

Period End	2020-09-30	2019-12-31
Value	1343	995
Percentage of DebtInstrumentFaceAmount	3061.3	288.4

us-gaap:DebtInstrumentInterestRateEffectivePercentage us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentInterestRateEffectivePercentage

etsy:ConvertibleSeniorNotesDue2027, us-gaap:ConvertibleDebt

Period End	2020-08-31
Value	3.5
Percentage of DebtInstrumentInterestRateEffectivePercentage	100.0

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

us-gaap:DebtInstrumentUnamortizedDiscount

etsy:ConvertibleSeniorNotesDue2023, us-gaap:ConvertibleDebt

Period End	2020-09-30	2019-12-31
Value	4.754	48
Percentage of DebtInstrumentUnamortizedDiscount	100.0	100.0

etsy:ConvertibleSeniorNotesDue2026, us-gaap:ConvertibleDebt

Period End	2020-09-30	2019-12-31
Value	134	148
Percentage of DebtInstrumentUnamortizedDiscount	2822.8	309.5

etsy:ConvertibleSeniorNotesDue2027, us-gaap:ConvertibleDebt

Period End	2020-09-30
Value	134
Percentage of DebtInstrumentUnamortizedDiscount	2831.9

us-gaap:DebtInstrumentUnamortizedDiscount us-gaap:LongtermDebtType

us-gaap:ConvertibleDebt

Period End	2020-09-30	2019-12-31
Value	273	196
Percentage of DebtInstrumentUnamortizedDiscount	5754.7	409.5

us-gaap:DeferredIncomeTaxAssetsNet

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2017-12-31
Value	1.819	8.336	15	14	22	23	23	23	0.159
Percentage of DeferredIncomeTaxAssetsNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:EmployeeRelatedLiabilitiesCurrentAndNoncurrent

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

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions

us-gaap:RestrictedStockUnitsRSU

Period End	2020-09-30
Value	143
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions

us-gaap:EmployeeStockOption

Period End	2020-09-30
Value	23
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	100.0

us-gaap:FinanceLeaseLiabilityCurrent

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31
Value	8345000.0	8073000.0	8000000.0	8275000.0	8770000.0	9306000.0	9927000.0	3884000.0
Percentage of FinanceLeaseLiabilityCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:FinanceLeaseLiabilityNoncurrent

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31
Value	47	49	51	53	55	57	59	2.095
Percentage of FinanceLeaseLiabilityNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2015-12-31	2014-12-31
Value	21	17	13	16	13	10	8.794	7.378	5.924	4.446	3.7	3.1	2.5	3.274	5.674	4.209	5.483	3.792	2.3
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:LongTermDebtFairValue us-gaap:DebtInstrument, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:LongtermDebtType

us-gaap:LongTermDebtFairValue

etsy:ConvertibleSeniorNotesDue2023, us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:ConvertibleDebt

Period End	2020-09-30	2019-12-31
Value	38	291
Percentage of LongTermDebtFairValue	100.0	100.0

etsy:ConvertibleSeniorNotesDue2023, us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:ConvertibleDebt

Period End	2020-09-30	2019-12-31
Value	41	310
Percentage of LongTermDebtFairValue	106.3	106.4

etsy:ConvertibleSeniorNotesDue2026, us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:ConvertibleDebt

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	508	517	442	522	496
Percentage of LongTermDebtFairValue	1316.3	0.0	0.0	179.0	0.0

etsy:ConvertibleSeniorNotesDue2026, us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:ConvertibleDebt

Period End	2020-09-30	2019-12-31
Value	538	522
Percentage of LongTermDebtFairValue	1392.7	179.0

etsy:ConvertibleSeniorNotesDue2027, us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:ConvertibleDebt

Period End	2020-09-30
Value	507
Percentage of LongTermDebtFairValue	1312.0

etsy:ConvertibleSeniorNotesDue2027, us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:ConvertibleDebt

Period End	2020-09-30
Value	513
Percentage of LongTermDebtFairValue	1329.6

etsy:ConvertibleSeniorNotesdue2023, us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:ConvertibleDebt

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31
Value	312	289	310	301	303	292	279
Percentage of LongTermDebtFairValue	0.0	0.0	106.4	0.0	0.0	0.0	0.0

us-gaap:LongTermDebtFairValue us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:LongtermDebtType

us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:ConvertibleDebt

Period End	2020-09-30	2019-12-31
Value	1054	785
Percentage of LongTermDebtFairValue	2728.3	269.1

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:ConvertibleDebt

Period End	2020-09-30	2019-12-31
Value	1093	832
Percentage of LongTermDebtFairValue	2828.6	285.4

us-gaap:OtherEmployeeRelatedLiabilitiesCurrentAndNoncurrent

Period End	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2017-12-31
Value	8935000.0	3172000.0	3058000.0	2604000.0	3603000.0	2406000.0	2920000.0
Percentage of OtherEmployeeRelatedLiabilitiesCurrentAndNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization

Period End	2020-09-30	2020-06-30	2019-12-31
Value	118	126	144
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	100.0	100.0	100.0

us-gaap:SalesAndExciseTaxPayableCurrentAndNoncurrent

Period End	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2017-12-31
Value	29	39	25	14	10	12	3.682
Percentage of SalesAndExciseTaxPayableCurrentAndNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

us-gaap:RestrictedStockUnitsRSU

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2014-12-31
Value	3692800.0	4013800.0	2960400.0	3193500.0	3282900.0	3709100.0	3480400.0	3791400.0	4349300.0	4583000.0	3074200.0	3345700.0	4003900.0	4069900.0	3135200.0	2852200.0	2155200.0	1622800.0	395850.0	0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:RestrictedStockUnitsRSU

Period End	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	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2014-12-31
Value	46.87	43.46	42.18	40.61	38.63	35.07	32.52	22.87	20.97	19.66	17.99	11.98	11.58	11.06	10.77	10.7	10.31	8.78	9.56	13.7	0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice

Period End	2020-09-30
Value	13.07
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue

Period End	2020-09-30	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31
Value	564	185	239	74	43	31	134
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1

Period End	2020-09-30
Value	386
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	100.0

us-gaap:StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

Period End	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	2018-06-30	2018-03-31	2017-12-31
Value	77	77	77	102	124	127	127	155	0.0	0.0	21	89
Percentage of StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	0.0	100.0	100.0

us-gaap:UnamortizedDebtIssuanceExpense us-gaap:DebtInstrument

us-gaap:UnamortizedDebtIssuanceExpense

etsy:CreditAgreement

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	0.9	1.0	1.1	1.1	1.2	1.3	1.3
Percentage of UnamortizedDebtIssuanceExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:UnamortizedDebtIssuanceExpense us-gaap:DebtInstrument, us-gaap:LongtermDebtType

etsy:ConvertibleSeniorNotesDue2023, us-gaap:ConvertibleDebt

Period End	2020-09-30	2019-12-31
Value	0.513	5.192
Percentage of UnamortizedDebtIssuanceExpense	57.0	472.0

etsy:ConvertibleSeniorNotesDue2026, us-gaap:ConvertibleDebt

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30
Value	7.002	7.3	7.5	7.8	8.1
Percentage of UnamortizedDebtIssuanceExpense	778.0	730.0	681.8	709.1	675.0

etsy:ConvertibleSeniorNotesDue2027, us-gaap:ConvertibleDebt

Period End	2020-09-30
Value	8.224
Percentage of UnamortizedDebtIssuanceExpense	913.8

etsy:ConvertibleSeniorNotesdue2023, us-gaap:ConvertibleDebt

Period End	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31
Value	4.4	4.8	5.2	5.6	5.9	6.3	6.7
Percentage of UnamortizedDebtIssuanceExpense	440.0	436.4	472.7	466.7	453.8	484.6	0.0

us-gaap:UnamortizedDebtIssuanceExpense us-gaap:LongtermDebtType

us-gaap:ConvertibleDebt

Period End	2020-09-30	2019-12-31
Value	15	12
Percentage of UnamortizedDebtIssuanceExpense	1748.8	1178.3

us-gaap:UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2018-12-31	2017-12-31
Value	200000.0	200000.0	200000.0	200000.0	1000000.0	800000.0	500000.0	200000.0
Percentage of UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

Period End	2020-09-30
Value	21
Percentage of UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	100.0

Line plots across dimensions of each concept

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
(None,)

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

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:IncomeStatementLocation
(None,)

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

us-gaap:LongTermDebt
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
(None, 'us-gaap:ConvertibleDebt')

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

ETSY

Table of contents

Plots across concepts

Tables

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued

Common Stock Shares Authorized

us-gaap:CommonStockSharesAuthorized

us-gaap:CommonStockSharesAuthorized

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents

us-gaap:CommonStock

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:ConvertibleDebtSecurities

us-gaap:EmployeeStockOption

us-gaap:RestrictedStockUnitsRSU

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

etsy:MarketplaceRevenue

etsy:ServicesRevenue

Revenues

us-gaap:Revenues

us-gaap:Revenues

Cost Of Revenue

us-gaap:CostOfRevenue

us-gaap:CostOfRevenue

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostOfGoodsAndServicesSold

Gross Profit

us-gaap:GrossProfit

us-gaap:GrossProfit

Operating Expenses

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses

Research And Development Expense

us-gaap:ResearchAndDevelopmentExpense

us-gaap:ResearchAndDevelopmentExpense

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense

Selling And Marketing Expense

us-gaap:SellingAndMarketingExpense

us-gaap:SellingAndMarketingExpense

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:DebtInstrument, us-gaap:LongtermDebtType

etsy:ConvertibleSeniorNotesDue2023, us-gaap:ConvertibleDebt

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense