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Stockholders' Equity - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012 | 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 credit agreement prohibited the repurchase of shares until February 2014, after which repurchases may be made subject to compliance with certain covenants. |  |  |
Shares available for grant | 682,330 |  |  |
Expected dividend yield | 0.00% | 0.00% | 0.00% |
Weighted average remaining term for stock options outstanding | 5 years 8 months 12 days |  |  |
Aggregate intrinsic value for stock options outstanding | 12,800,000 |  |  |
Aggregate intrinsic value for stock options exercisable | 8,200,000 |  |  |
Proceeds from exercise of stock options | 1,900,000 | 1,400,000 |  |
Intrinsic value of stock options exercised | 4,000,000 | 2,600,000 |  |
Unrecognized stock compensation related to unvested option awards | 1,000,000 |  |  |
Expected date through which unrecognized stock compensation is recognized | Jan. 31, 2018 |  |  |
Weighted average grant date fair value |  | $ 12.06 | $ 12.97 |
Maximum |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Term of option awards | 10 years |  |  |
Restricted Stock Units (RSUs) |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Recognized compensation expense | 9,200,000 | 7,000,000 |  |
Unrecognized stock compensation related to restricted stock units | 26,100,000 | 21,400,000 |  |
Restricted Stock Units (RSUs) | Minimum |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Vesting period of awards | 3 years |  |  |
Restricted Stock Units (RSUs) | Maximum |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Vesting period of awards | 5 years |  |  |
Stock Options |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Recognized compensation expense | $ 700,000 | $ 700,000 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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