Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 61,868	$ 69,217	$ 168,669	$ 171,211
Other comprehensive income (loss):
Foreign currency translation gains (losses)	4,823	1,945	8,599	(1,436)
Unrealized losses on derivative instrument	(1,268)	(1,392)	(1,994)	(1,392)
Net unrealized (losses) gains on marketable securities	(525)	8	415	522
Other comprehensive income (loss)	3,030	561	7,020	(2,306)
Comprehensive income	$ 64,898	$ 69,778	$ 175,689	$ 168,905