Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Net income (loss)	$ 15,014	$ 1,495	$ (11,755)
Other comprehensive (loss) income:
Foreign currency translation (losses) gains	(1,974)	(2,510)	1,747
Net unrealized gains on marketable securities	2
Other comprehensive (loss) income	(1,972)	(2,510)	1,747
Comprehensive income (loss)	$ 13,042	$ (1,015)	$ (10,008)