CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 148,910	$ 152,899	$ 382,737	$ 465,689
Other comprehensive income (loss):
Foreign currency translation adjustments, net of zero tax	30,063	(15,154)	2,579	(24,982)
Unrealized gain (loss) on derivative instruments and other, net of zero tax	10,497	(22,797)	17,782	(14,505)
Comprehensive income	$ 189,470	$ 114,948	$ 403,098	$ 426,202