Certain Financial Statement Information (Details 16) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Schedule of Reconciliation of Shares Used to Calculate Basic and Diluted Net (Loss) Income Per Share
Net loss	$ (21,557)	$ (1,152)	$ (44,947)	$ (8,029)
Shares used in net loss per share computation:
Weighted average common shares outstanding, basic	64,947	62,526	63,678	63,202
Net effect of dilutive common share equivalents
Weighted average common shares outstanding, diluted	64,947	62,526	63,678	63,202
Basic and diluted net loss per share	$ (0.33)	$ (0.02)	$ (0.71)	$ (0.13)