Basis of Financial Statement Presentation - ASC 606 Adjustment Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2019		Sep. 30, 2018		Sep. 30, 2019	Sep. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net income (loss)	$ (15,260)	[1]	$ 37,141	[1]	$ 25,080	$ 72,361
Foreign currency translation gains (losses)	(7,966)		(3,149)		(4,787)	(27,352)
Other comprehensive income (loss)	(11,949)		2,242		(13,349)	(26,410)
Total comprehensive income (loss)	$ (27,209)		$ 39,383		$ 11,731	$ 45,951

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