Summary of Significant Accounting Policies, Stock Options, Valuation Assumptions (Details) (USD $)	12 Months Ended
Aug. 25, 2012	Aug. 27, 2011	Aug. 28, 2010
Share-based Payment Award, Fair Value Assumptions [Abstract]
Risk-free interest rate (in hundredths)	1.54%	1.98%	2.97%
Expected dividend yield (in hundredths)	0.56%	0.60%	0.62%
Expected life (in years)	7.39	7.32	7.39
Expected volatility (in hundredths)	33.80%	34.80%	39.30%
Weighted average fair values of options granted during fiscal year	$ 18.28	$ 17.59	$ 18.86

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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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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