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Weighted Average Assumptions used in Option-Valuation Model (Detail)	12 Months Ended
	Sep. 29, 2012 OptionPlan	Oct. 01, 2011 OptionPlan	Oct. 02, 2010 OptionPlan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.00%	3.20%	3.50%
Expected volatility	31.00%	28.00%	32.00%
Dividend yield	1.56%	1.15%	1.41%
Termination rate	2.70%	2.50%	2.50%
Exercise multiple	1.41	1.40	1.40

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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