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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 | 9 Months Ended | ||
|---|---|---|---|---|
|
Apr. 28, 2012
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Apr. 30, 2011
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Apr. 28, 2012
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Apr. 30, 2011
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Non-cash stock-based compensation expense | $ 6.1 | $ 4.2 | $ 21.2 | $ 12.8 |
| Income tax benefit | $ (2.3) | $ (1.7) | $ (8.0) | $ (5.0) |