Stockholders' Equity - Option Activity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Schedule of Option Activity Under Stock Incentive Plans
Number of Shares, Outstanding at the beginning of the year	4,164	5,390	6,310
Number of Shares, Granted	40	250	599
Number of Shares, Exercised	(161)	(156)	(549)
Number of Shares, Forfeited	(551)	(1,320)	(970)
Number of Shares, Outstanding at the end of the period	3,492	4,164	5,390
Vested and expected to vest at the end of the period	3,485	4,112	5,288
Number of Shares, Vested at the end of the period	2,994	3,119	3,810
Schedule of Weighted Average Exercise Price Per Share Under Stock Incentive Plans
Weighted Average Exercise Price Per Share, Outstanding at the beginning of the year (USD per share)	$ 10.67	$ 11.91	$ 11.76
Weighted Average Exercise Price Per Share, Granted (USD per share)	$ 5.58	$ 10.10	$ 11.89
Weighted Average Exercise Price Per Share, Exercised (USD per share)	$ 5.31	$ 5.11	$ 7.32
Weighted Average Exercise Price Per Share, Forfeited (USD per share)	$ 14.49	$ 16.20	$ 13.60
Weighted Average Exercise Price Per Share, Outstanding at the end of the period (USD per share)	$ 10.26	$ 10.67	$ 11.91
Weighted Average Exercise Price Per Share, Vested and expected to vest at the end of the period (USD per share)	$ 10.26	$ 10.69	$ 11.96
Weighted Average Exercise Price Per Share, Vested at the end of the period (USD per share)	$ 10.52	$ 11.28	$ 13.35