Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands		12 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net loss		$ (32,571)	$ (52,058)	$ (5,694)
Change in other comprehensive loss, net of tax:
Unrealized loss on investments	[1]	(1,648)	(954)	(5,039)
Loss on foreign currency translation		(419)	(389)	(367)
Other comprehensive loss, net of tax		(2,067)	(1,343)	(5,406)
Total comprehensive loss		(34,638)	(53,401)	(11,100)
Reclassification adjustment from AOCI for sale of securities, Net of tax		$ 1,500	$ 1,400	$ 3,400

[1] The amounts reclassified from accumulated other comprehensive loss and recorded in realized gain on short-term investments and interest income, net in the Consolidated Statements of Operations relating to short-term investments were $1.5 million, $1.4 million and $3.4 million for the fiscal years ended March 31, 2016, 2015 and 2014, respectively. Refer to Note 3, Certain Financial Statement Information, to the Consolidated Financial Statements for additional details.