Consolidated Statements of Comprehensive Loss (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Net loss	$ (134,115)	$ (82,688)	$ (1,006)
Other comprehensive gain (loss), net of tax:
Unrealized gain (loss) on short-term investments	1,314	186	(4,400)
FAS 115-2 disposition release	0	0	858
Loss on foreign currency translation	(286)	(354)	(485)
Other comprehensive gain (loss), net of tax	1,028	(168)	(4,027)
Total comprehensive loss	$ (133,087)	$ (82,856)	$ (5,033)