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Awards Granted, Weighted-Average Exercise Price, Weighted-Average Fair Value and Weighted-Average Assumptions Used in the Calculation of Compensation Expense (Detail) (Employee Stock Option And Stock Appreciation Rights, USD $)	12 Months Ended
	Oct. 02, 2011	Oct. 03, 2010
Employee Stock Option And Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per award	$ 7.42	$ 5.25
Risk free rate	0.20%	0.20%
Expected dividend yield	0.00%	0.00%
Expected life	1 year 1 month 6 days	6 months
Expected volatility	41.60%	34.30%

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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