CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ (45,169)	$ 118,333	$ 157,751	$ 448,129
Other comprehensive income (loss):
Foreign currency translation adjustments, net of zero tax	(7,777)	7,492	(58,485)	27,806
Unrealized gain (loss) on derivative instruments and other, net of zero tax	4,635	(4,717)	(15,193)	(20,761)
Comprehensive income	$ (48,311)	$ 121,108	$ 84,073	$ 455,174