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Fair Value of Employee Stock Option Plans with Weighted Average Assumptions (Detail) (Employee Stock Option, USD $)	3 Months Ended		9 Months Ended
	Jun. 29, 2012	Jul. 01, 2011	Jun. 29, 2012	Jul. 01, 2011
Employee Stock Option
Employee Stock Option Disclosures
Expected term (in years)	4 years 6 months 18 days	5 years 2 months 9 days	4 years 7 months 21 days	4 years 9 months
Risk-free interest rate	0.70%	1.80%	0.80%	2.00%
Expected volatility	34.30%	34.50%	36.90%	35.50%
Expected dividend	0.00%	0.00%	0.00%	0.00%
Weighted average fair value at grant date	$ 19.14	$ 23.23	$ 18.75	$ 23.26

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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