Certain Financial Statement Information (Details 16) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Schedule of Reconciliation of Shares Used to Calculate Basic and Diluted Net (Loss) Income Per Share
Net loss (USD)	$ (71,562)	$ (7,077)	$ (116,509)	$ (15,106)
Shares used in net loss per share computation:
Weighted average common shares outstanding, basic	66,113	60,990	64,489	62,465
Net effect of dilutive common share equivalents	0	0	0	0
Weighted average common shares outstanding, diluted	66,113	60,990	64,489	62,465
Basic and diluted net loss per share (USD per share)	$ (1.08)	$ (0.12)	$ (1.81)	$ (0.24)