CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019		Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 404,459	$ 333,837	[1]	$ 173,533	[1]
Other comprehensive (loss) income
Foreign currency translation adjustment	(27,445)	(28,803)		43,379
Cash flow hedges:
Change in unrealized gains	10,504	763		(8,153)
Reclassification to earnings	(1,689)	3,726		0
Tax effect on effective cash flow hedges	775	417		(2,038)
Change in fair value of cash flow hedges	9,590	4,906		(10,191)
Available-for-sale securities:
Net unrealized (loss) gain, net of taxes	(3,332)	2,440		(1,778)
Change in fair value of available-for-sale securities	(3,332)	2,440		(1,778)
Other comprehensive (loss) income	(21,187)	(21,457)		31,410
Comprehensive income	$ 383,272	$ 312,380		$ 204,943

[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.