Condensed Consolidated Statements of Comprehensive Loss (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2013		Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net loss	$ (7,284)		$ (71,562)		$ (28,810)		$ (116,509)
Other comprehensive loss, net of tax:
Unrealized gain (loss) on investments	(179)	[1]	(659)	[1]	(5,404)	[1]	196	[1]
Loss on foreign currency translation	(37)		(127)		(377)		(249)
Other comprehensive loss, net of tax	(216)		(786)		(5,781)		(53)
Total comprehensive loss	(7,500)		(72,348)		(34,591)		(116,562)
Reclassification adjustment from AOCI to earnings, short term investments	$ (6)		$ (207)		$ (3,290)		$ (1,401)

[1] The amounts reclassified from accumulated other comprehensive loss and recorded in interest income (expense), net in the Condensed Consolidated Statement of Operations relating to short term investments were zero and $3.3 million for the three and nine months ended December 31, 2013, respectively, and $0.2 million and $1.4 million for the three and nine months ended December 31, 2012, respectively. Refer to Note 2, Certain Financial Statement Information, to the Condensed Consolidated Financial Statements for additional details.