CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 12,910	$ 8,859
Other comprehensive (loss) income:
Foreign currency translation (losses) gains	(1,699)	1,598
Net unrealized gains on marketable securities	150	10
Other comprehensive (loss) income	(1,549)	1,608
Comprehensive income	$ 11,361	$ 10,467