CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 71,693	$ 60,276	[1]
Other comprehensive (loss) income:
Foreign currency translation adjustment	(26,817)	9,476
Cash flow hedges:
Change in unrealized gains	991	0
Tax effect on effective cash flow hedges	133	0
Change in fair value of effective cash flow hedge	1,124	0
Unrealized loss, net on available-for-sale securities, net of taxes	409	84
Reclassification to earnings for realized losses, net on available for sale securities, net of taxes	0	0
Change in fair value of available for sale securities	409	84
Other comprehensive (loss) income	(25,284)	9,560
Comprehensive income (loss)	$ 46,409	$ 69,836

[1] Prior period amounts have been adjusted retrospectively to reflect the adoption of ASU 2016-08, Statement of Cash Flows (Topic 230): Restricted Cash. Refer to Note 1 for further discussion.