CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 25,140	$ (29,842)	$ 82,680	$ (31,977)
Other comprehensive (loss) income:
Foreign currency translation adjustment	(385)	(5,040)	23,391	(10,067)
Cash flow hedges:
Change in fair value of effective cash flow hedge	(1,423)	0	(6,639)	0
Unrealized loss, net on available-for-sale securities, net of taxes	(816)	(264)	(705)	(221)
Reclassification to earnings for realized losses, net on available for sale securities, net of taxes	0	0	0	9
Change in fair value of available for sale securities	(816)	(264)	(705)	(212)
Other comprehensive (loss) income	(2,624)	(5,304)	16,047	(10,279)
Comprehensive income (loss)	$ 22,516	$ (35,146)	$ 98,727	$ (42,256)