Stock-Based Compensation - 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 - $ / shares	12 Months Ended
	Sep. 27, 2015	Sep. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value per award	$ 24.18	$ 20.08
Risk free rate	0.10%	0.50%
Expected dividend yield	0.00%	0.00%
Expected life	8 months	2 years 8 months 6 days
Expected volatility	36.60%	31.00%