CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 182,248	$ 163,642	$ 370,074	$ 281,737
Other comprehensive income (loss):
Foreign currency translation adjustment	30,135	18,172	53,697	(3,192)
Cash flow hedges:
Change in unrealized gains	0	(3,728)	(3,817)	2,297
Reclassification to earnings	(600)	2,184	(1,933)	(1,157)
Tax effect on effective cash flow hedges	0	(386)	845	301
Change in fair value of effective cash flow hedge	(600)	(1,930)	(4,905)	1,441
Change in fair value of available for sale securities	(295)	(267)	4,000	453
Other comprehensive income (loss)	29,240	15,975	52,792	(1,298)
Comprehensive income	$ 211,488	$ 179,617	$ 422,866	$ 280,439