Employee Stock Plans - Summary the Effect of Recording Pre-Tax Share-Based Compensation Expense for Equity Incentive Awards (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 26, 2014		Sep. 27, 2013		Sep. 28, 2012
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 39,636		$ 42,637		$ 47,875
Restricted Stock Units and Restricted Stock Awards
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expense	26,576	[1]	28,229	[1]	32,527	[1]
Employee Stock Purchase Plans
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expense	3,571		3,831		3,179
Equity Option
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 9,489		$ 10,577		$ 12,169

[1] Restricted stock units and restricted stock awards include performance units and deferred stock units.