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Stockholders' Equity - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 30, 2010 | Jul. 31, 2006 | Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2011 | Sep. 30, 2011
Stockholders Equity [Line Items] |  |  |  |  |  |
Common stock, shares, repurchase program |  |  |  |  |  | 2,000,000
Repurchases of common stock |  |  |  | 125,000 |  |
Repurchases of stock, value |  |  |  | $ 2,929,000 |  |
Share repurchase description |  |  | The Company's new credit agreement prohibits the repurchase of shares until February 2014, after which repurchases may be made subject to compliance with certain covenants. |  |  |
Shares available for grant |  |  | 967,057 |  |  |
Expected dividend yield |  |  | 0.00% | 0.00% | 0.00% |
Weighted average remaining term for stock options outstanding |  |  | 6 years 1 month 6 days |  |  |
Aggregate intrinsic value for stock options outstanding |  |  | 5,800,000 |  |  |
Aggregate intrinsic value for stock options exercisable |  |  | 4,300,000 |  |  |
Proceeds from exercise of stock options |  |  | 1,400,000 | 600,000 |  |
Intrinsic value of stock options exercised |  |  | 2,600,000 | 1,400,000 |  |
Unrecognized stock compensation related to unvested option awards |  |  | 1,700,000 |  |  |
Expected date through which unrecognized stock compensation is recognized |  |  | Jan. 31, 2017 |  |  |
Weighted average grant date fair value |  |  | $ 12.06 | $ 12.97 | $ 18.01 |
Unrecognized stock compensation related to restricted stock units |  |  | 21,400,000 | 16,000,000 |  |
Term of warrants |  | 5 years |  |  |  |
Shares of common stock to be purchased for warrant rights |  | 375,000 |  |  |  |
Exercise price of warrants |  | $ 11.00 |  |  |  |
Proceeds from exercise of stock warrants | 4,100,000 |  |  |  | 4,129,000 |
Maximum |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Term of option awards |  |  | 10 years |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Recognized compensation expense |  |  | 7,000,000 | 4,400,000 |  |
Restricted Stock Units (RSUs) | Maximum |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Vesting period of awards |  |  | 5 years |  |  |
Restricted Stock Units (RSUs) | Minimum |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Vesting period of awards |  |  | 3 years |  |  |
Stock Options |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Recognized compensation expense |  |  | $ 700,000 | $ 800,000 |  |

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