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Assumptions for the Employee SARs and Stock Options Granted (Detail) (Stock Option Program and Stock Appreciation Right Program)	6 Months Ended
	Jun. 15, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	31.00%
Dividend yield	1.01%
Risk-free rate, minimum	1.90%
Risk-free rate, maximum	2.00%
Lower Limit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term	8 years
Upper Limit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term	10 years

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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