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Share-Based Compensation - Weighted-Average Assumptions Used To Estimate Fair Value Option Awards (Detail)	12 Months Ended
	Oct. 26, 2012	Oct. 28, 2011	Oct. 29, 2010
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Line Items]
Risk free interest rate	0.40%	0.77%	1.23%
Expected volatility	44.92%	41.07%	49.14%
Expected life in years	3 years 8 months 12 days	3 years 9 months 18 days	3 years 4 months 24 days
Dividend yield	0.90%	0.90%	1.37%

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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