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	$ 87,579	$ 93,399	$ 428,534
Other comprehensive income (loss):
Foreign currency translation adjustments, net of zero tax	(23,397)	(59,508)	45,618
Unrealized gain (loss) on derivative instruments and other, net of zero tax	(40,107)
Unrealized gain (loss) on derivative instruments and other, net of zero tax		(5,810)	(3,320)
Comprehensive income	$ 24,075	$ 28,081	$ 470,832