Consolidated Statements of Comprehensive Loss (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net loss	$ (52,058)		$ (5,694)		$ (134,115)
Other comprehensive gain (loss), net of tax:
Unrealized (loss) gain on investments	(954)	[1]	(5,039)	[1]	1,314	[1]
Loss on foreign currency translation	(389)		(367)		(286)
Other comprehensive (loss) gain, net of tax	(1,343)		(5,406)		1,028
Total comprehensive loss	(53,401)		(11,100)		(133,087)
Reclassification adjustment from AOCI for sale of securities, Net of tax	$ (1,353)		$ (3,360)		$ (1,391)

[1] The amounts reclassified from accumulated other comprehensive loss and recorded in net realized gain on short-term investments and interest income, net in the Consolidated Statements of Operations relating to short-term investments were $1.4 million, $3.4 million and $1.4 million for the fiscal years ended March 31, 2015, 2014 and 2013, respectively. Refer to Note 3, Certain Financial Statement Information, to the Consolidated Financial Statements for additional details.