Share-Based Payments (Details)	12 Months Ended
May 29, 2011	May 30, 2010	May 31, 2009
Weighted average Black-Scholes assumptions for stock options granted
Expected volatility (%)	22.83%	22.94%	18.16%
Dividend yield (%)	3.51%	3.77%	3.30%
Risk-free interest rate (%)	1.72%	2.31%	3.31%
Expected life of stock option (years)	4.82	4.75	4.67

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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