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Fair Value of Employee Stock Purchase Plan with Weighted Average Assumptions (Detail) (USD $)	12 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 30, 2011
Employee Stock Option plans
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	4 years 9 months 4 days	4 years 7 months 21 days	4 years 9 months
Risk-free interest rate	0.60%	0.80%	2.00%
Expected volatility	32.20%	36.90%	35.50%
Expected dividend yield	0.00%	0.00%	0.00%
Weighted average fair value at grant date	$ 19.73	$ 18.75	$ 23.26
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	6 months	6 months	6 months
Risk-free interest rate	0.10%	0.10%	0.10%
Expected volatility	16.50%	19.30%	14.00%
Expected dividend yield	0.00%	0.00%	0.00%
Weighted average fair value at grant date	$ 12.95	$ 12.17	$ 12.61

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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