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Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2020
Operating Loss Carryforwards [Line Items]
Provision for (benefit from) income taxes	$ 56,301	$ (2,598)		$ 70,304	$ 3,938
Effective income tax rates	17.40%	(3.70%)		17.20%	3.20%
Full statutory income tax rate	13.63%		13.63%	13.63%
Transitional income tax benefit		$ 5,900
Discrete tax benefits from recognition of excess tax benefits				$ 5,800	$ 6,700
Reversal of uncertain tax positions				1,500	1,800
Unrecognized tax benefits	$ 152,500			152,500		$ 140,800
Accrued interest and penalties related to uncertain tax positions	4,800			4,800		4,500
Expected decrease in uncertain tax positions	4,700			4,700
Non-current income tax payable
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits	$ 54,500			$ 54,500		$ 40,800
SWITZERLAND
Operating Loss Carryforwards [Line Items]
Tax benefit from remeasurement of deferred income tax and benefit		$ 4,000			$ 1,700

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