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Stockholders' Equity (Tables) | 12 Months Ended
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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

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