CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 93,399	$ 428,534	$ 319,564
Other comprehensive income (loss):
Foreign currency translation adjustments, net of zero tax	(59,508)	45,618	(1,324)
Unrealized gain (loss) on derivative instruments and other, net of zero tax	(5,810)	(3,320)	9,096
Comprehensive income	$ 28,081	$ 470,832	$ 327,336