Stock-Based Compensation - Narrative (Detail) shares in Millions, $ in Millions	12 Months Ended
	Sep. 27, 2015 USD ($) shares	Sep. 28, 2014 USD ($) shares	Sep. 29, 2013 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $	$ 49.8	$ 43.9	$ 35.2
Unamortized compensation expense related to unvested options and restricted stock awards, net of forfeitures | $	$ 56.3
Compensation expense related to nonvested restricted stock options, recognition periods	1 year 5 months
Common stock for delivery under awards that have been and may be granted	11.7	14.1	12.2
Stock Option Plan 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares to the shares limit in common stock	4.8
Shares limit in common stock	33.3
Plan expiration date	Dec. 05, 2021
Full value award of shares issued for every one share	2.41
Maximum term of a stock option grant or a stock appreciation right grant	6 years