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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
	Oct. 29, 2011	Oct. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 7.5	$ 4.1
Income tax benefit	$ (2.8)	$ (1.6)

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.

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