Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands		12 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Shareholders Equity [Line Items]
Beginning Balance		$ 1,329,675	$ 1,065,466	$ 936,890
Ending Balance		1,503,326	1,329,675	1,065,466
Foreign Currency Translation (Losses)/ Gains
Shareholders Equity [Line Items]
Beginning Balance		(14,718)	(16,860)	(15,028)
Other comprehensive (loss) income		(5,844)	2,142	(1,832)
Ending Balance		(20,562)	(14,718)	(16,860)
Unrealized Gains (Losses) on Derivative Instruments
Shareholders Equity [Line Items]
Beginning Balance		1,904	3,999	0
Other comprehensive (loss) income		(1,779)	(2,095)	3,999
Ending Balance		125	1,904	3,999
Net Unrealized Gains (Losses) on Marketable Securities, net of Tax
Shareholders Equity [Line Items]
Beginning Balance	[1]	1,369	1,672	339
Other comprehensive (loss) income	[1]	(8,092)	(303)	1,333
Ending Balance	[1]	(6,723)	1,369	1,672
Accumulated Other Comprehensive (Loss)
Shareholders Equity [Line Items]
Beginning Balance		(11,445)	(11,189)	(14,689)
Other comprehensive (loss) income		(15,715)	(256)	3,500
Ending Balance		$ (27,160)	$ (11,445)	$ (11,189)

[1] The tax impact on unrealized gains and losses on marketable securities was not material during the fiscal years ended March 31, 2022, 2021 and 2020.