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Summary of Total Compensation Expense and Associated Income Tax Benefit Recognized Related to Stock-Based Compensation Arrangements (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jan. 28, 2012
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Jan. 29, 2011
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Jan. 28, 2012
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Jan. 29, 2011
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Non-cash stock-based compensation expense | $ 7.6 | $ 4.5 | $ 15.1 | $ 8.6 |
| Income tax benefit | $ (2.9) | $ (1.8) | $ (5.7) | $ (3.3) |