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Stockholders' Equity (Tables) | 12 Months Ended
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Jan. 31, 2013
Information Regarding All Stock Options | Information regarding all stock options for fiscal 2013, 2012 and 2011 is as follows:
|  | 2013 |  |  | 2012 |  |  | 2011 |
| Shares |  |  | Weighted Average Exercise Price |  |  | Shares |  |  | Weighted Average Exercise Price |  |  | Shares |  |  | Weighted Average Exercise Price |
Stock options outstanding at beginning of year |  |  | 417,722 |  |  | $ | 16.59 |  |  |  | 514,190 |  |  | $ | 14.54 |  |  |  | 817,050 |  |  | $ | 11.23 |
Exercised |  |  | (120,518 | ) |  | $ | 11.82 |  |  |  | (60,668 | ) |  | $ | 10.21 |  |  |  | (339,010 | ) |  | $ | 8.23 |
Granted |  |  | 85,000 |  |  | $ | 28.72 |  |  |  | 40,000 |  |  | $ | 27.13 |  |  |  | 38,000 |  |  | $ | 29.59 |
Cancelled or forfeited |  |  | (150 | ) |  | $ | 18.40 |  |  |  | (75,800 | ) |  | $ | 13.35 |  |  |  | (1,850 | ) |  | $ | 18.40 |
Stock options outstanding at end of year |  |  | 382,054 |  |  | $ | 20.79 |  |  |  | 417,722 |  |  | $ | 16.59 |  |  |  | 514,190 |  |  | $ | 14.54 |
Exercisable |  |  | 224,121 |  |  | $ | 16.89 |  |  |  | 245,556 |  |  | $ | 14.18 |  |  |  | 260,990 |  |  | $ | 12.32 |
Summary of Information about Stock Options Outstanding | The following table summarizes information about stock options outstanding:
Range of Exercise Prices |  | Number Outstanding as of January 31, 2013 |  |  | Weighted Average Remaining Contractual Life |  |  | Weighted Average Exercise Price |  |  | Number Exercisable as of January 31, 2013 |  |  | Weighted Average Exercise Price |
$3.00 - $ 8.00 |  |  | 22,100 |  |  |  | 1.09 |  |  | $ | 6.23 |  |  |  | 22,100 |  |  | $ | 6.23 |
$8.01 - $ 12.00 |  |  | 19,200 |  |  |  | 5.51 |  |  | $ | 10.28 |  |  |  | 12,000 |  |  | $ | 9.80 |
$12.01 - $ 16.00 |  |  | 68,900 |  |  |  | 5.12 |  |  | $ | 13.92 |  |  |  | 56,300 |  |  | $ | 13.78 |
$16.01 - $ 40.00 |  |  | 271,854 |  |  |  | 6.77 |  |  | $ | 24.46 |  |  |  | 133,721 |  |  | $ | 20.60 |
|  |  | 382,054 |  |  |  |  |  |  |  |  |  |  |  | 224,121 |  |  |  |  |
Weighted Average Assumptions Used in Black-Scholes Option Pricing Model | The following table summarizes the weighted average assumptions used in the Black-Scholes option pricing model for grants in fiscal 2013, 2012 and 2011, respectively:
|  | 2013 |  | 2012 |  | 2011
Expected stock price volatility |  | 58.2% - 68.5% |  | 68.5% |  | 64.1%
Expected lives of options |  |  |  |  |  |
Directors and officers |  | 7 years |  | 7 years |  | 7 years
Employees |  | 6 years |  | 6 years |  | 6 years
Risk-free interest rate |  | 0.3% - 0.6% |  | 1.2% |  | 2.3% - 3.4%
Expected dividend yield |  | 0% |  | 0% |  | 0%
Restricted Stock | Restricted Stock
|  | Awards Outstanding |  |  | Weighted Average Grant Date Fair Value |
Unvested as of January 31, 2011 |  |  | 658,882 |  |  | $ | 13.86 |
Granted |  |  | 437,850 |  |  | $ | 30.80 |
Vested |  |  | (162,332 | ) |  | $ | 9.16 |
Canceled |  |  | (8,500 | ) |  | $ | 24.03 |
Unvested as of January 31, 2012 |  |  | 925,900 |  |  | $ | 22.60 |
Granted |  |  | 358,985 |  |  | $ | 35.18 |
Vested |  |  | (226,341 | ) |  | $ | 12.54 |
Canceled |  |  | (1,813 | ) |  | $ | 29.28 |
Unvested as of January 31, 2013 |  |  | 1,056,731 |  |  | $ | 29.01 |

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