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Weighted Average Black-Scholes Assumptions for Stock Options Granted (Detail)	3 Months Ended
	Aug. 26, 2012
Expected volatility (%)	22.95%
Dividend yield (%)	3.77%
Risk-free interest rate (%)	0.57%
Expected life of stock option (years)	4 years 9 months 18 days

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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