Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 38,147	$ 113,688	$ 7,351
Other comprehensive income (loss):
Foreign currency translation gains (losses)	2,724	(16,613)	3,025
Net unrealized gain (losses) on marketable securities	66	13	(18)
Other comprehensive income (loss)	2,790	(16,600)	3,007
Comprehensive income	$ 40,937	$ 97,088	$ 10,358