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Stockholders' Equity (Tables)

12 Months Ended

Mar. 31, 2012

Stockholders' Equity [Abstract]

Components Of Employee Stock-Based Compensation Expense


		For the years ended
		March 31,
		2012		2011		2010
Stock options	$	6,177	$	6,374	$	5,895
Restricted stock and stock awards		3,633		6,919		7,535
Employee stock purchase plan		54		119		64
Total stock-based compensation expense	$	9,864	$	13,412	$	13,494

Summary Of Employee Stock-Based Compensation Expense By Financial Statement Line Item


		For the years ended
		March 31,
		2012		2011		2010
Cost of revenues	$	1,121	$	1,188	$	1,199
Research and development		2,562		1,977		2,023
Selling, general and administrative		6,181		10,247		10,272
Total stock-based compensation expense	$	9,864	$	13,412	$	13,494

Summary Of Employee And Non-Employee Stock Options Activity


					Weighted-
				Weighted-	Average
				Average	Remaining		Aggregate
	Options/			Exercise	Contractual		Intrinsic Value
	Shares			Price	Term		(thousands)
Outstanding at March 31, 2011	2,004,725		$	22.29
Granted at fair value	835,450			9.76
Exercised	(2,700	)		8.91
Cancelled/forfeited	(547,059	)		22.15
Outstanding at March 31, 2012	2,290,416		$	17.77	6.9	$	13.9

Exercisable at March 31, 2012	1,122,320		$	18.05	5.2	$	8.4

Fully vested and expected to vest at March 31, 2012	2,198,771		$	17.76	6.8	$	13.2

Schedule Of Weighted Average Assumptions Used In The Black-Scholes Valuation Model For Stock Options Granted


			For the years ended
			March 31,
	2012		2011		2010
Dividend yield	None		None		None
Expected volatility	70.0	%	64.2	%	68.9	%
Risk-free interest rate	1.8	%	2.2	%	2.6	%
Expected life (years)	5.9		5.8		5.6

Summary Of The Employee And Non-Employee Restricted Stock Activity


				Weighted		Intrinsic
				Average		Aggregate
				Grant Date		Value
	Shares			Fair Value		(thousands)
Outstanding at April 1, 2011	626,527		$	27.31
Granted	867,661			6.48
Vested	(406,773	)		23.86
Forfeited	(157,926	)		23.46
Outstanding at March 31, 2012	929,489		$	10.00	$	3,829