CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 179,948	$ 25,140	$ 277,007	$ 82,680	[1]
Other comprehensive income (loss):
Foreign currency translation adjustment	(16,331)	(385)	(40,666)	23,391
Cash flow hedges:
Change in unrealized gains (losses)	2,350	(1,423)	4,219	(6,639)
Tax effect on effective cash flow hedges	58	0	167	0
Change in fair value of effective cash flow hedge	2,408	(1,423)	4,386	(6,639)
Unrealized loss, net on available-for-sale securities, net of taxes	168	(816)	1,058	(705)
Change in fair value of available for sale securities	168	(816)	1,058	(705)
Other comprehensive (loss) income	(13,755)	(2,624)	(35,222)	16,047
Comprehensive income	$ 166,193	$ 22,516	$ 241,785	$ 98,727

[1] Prior period amounts have been adjusted retrospectively to reflect the adoption of ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. Refer to Note 1 for further discussion.