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Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Operating Loss Carryforwards [Line Items]
Provision for (benefit from) income taxes	$ (2,598)	$ 6,203	$ 3,938	$ 986
Effective income tax rates	(3.70%)	8.80%	3.20%	1.00%
Full statutory income tax rate	13.63%
Transitional income tax benefit	$ 5,900
Discrete tax benefits from reversal of uncertain tax positions	1,800	$ 1,400
Unrecognized tax benefits	78,900		$ 78,900		$ 76,500
Accrued interest and penalties related to uncertain tax positions	2,800		2,800		$ 2,500
Expected decrease in uncertain tax positions	3,700		3,700
Non-current income tax payable
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits	36,400		36,400
UNITED STATES
Operating Loss Carryforwards [Line Items]
Discrete tax benefits from recognition of excess tax benefits in the United States	6,700	$ 9,000
Switzerland
Operating Loss Carryforwards [Line Items]
Tax benefit from remeasurement of deferred income tax and benefit	$ 4,000		$ 1,700

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