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Accounting for Stock-Based Compensation - Additional Information (Detail) (Stock options - time vested, USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Aug. 03, 2013
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Jul. 28, 2012
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Aug. 03, 2013
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Jul. 28, 2012
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Stock options - time vested
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| Compensation Related Costs Share Based Payments Disclosure [Line Items] | ||||
| Unrecognized compensation expense | $ 44.9 | $ 44.9 | ||
| Weighted average period related to unrecognized compensation expense | 2 years 2 months 12 days | |||
| Total intrinsic values of options exercised during the period | $ 10.5 | $ 0.7 | $ 21.1 | $ 1.1 |