CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018		Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 333,837	$ 173,533	[1]	$ 67,303	[1]
Other comprehensive income (loss):
Foreign currency translation adjustment	(28,803)	43,379		(9,086)
Cash flow hedges:
Change in unrealized gains	763	(8,153)		0
Reclassification to earnings	3,726	0		0
Tax effect on effective cash flow hedges	(417)	2,038		0
Change in fair value of cash flow hedges	4,906	(10,191)		0
Available-for-sale securities:
Net unrealized gain (loss), net of taxes	2,440	(1,778)		(169)
Reclassification to earnings for realized net loss, net of taxes	0	0		9
Change in fair value of available-for-sale securities	2,440	(1,778)		(160)
Other comprehensive income (loss)	(21,457)	31,410		(9,246)
Comprehensive income	$ 312,380	$ 204,943		$ 58,057

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