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Stock-based Compensation (Assumptions Used in Monte Carlo Simulation) (Details)	3 Months Ended
	Oct. 31, 2010	Nov. 01, 2009
Stock-based Compensation
Risk-free interest rate	0.59%	1.27%
Expected dividend yield	3.00%	3.06%
Expected volatility	23.71%	24.83%
Expected term, years	3	3

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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