Stock-Based Compensation - Summary of Stock Option Activity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 24, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Beginning Balance, Outstanding, Number of Shares	11,638
Granted, Number of Shares	2,000
Exercised, Number of Shares	(285)
Cancelled or expired, Number of Shares	(782)
Ending Balance, Outstanding, Number of Shares	12,571	11,638
Exercisable, Number of Shares	6,409	4,601	4,162
Expected to vest, Number of Shares	5,388
Beginning Balance, Outstanding, Weighted Average Exercise Price per share	$ 10.73
Granted, Weighted Average Exercise Price per share	$ 8.40
Exercised, Weighted Average Exercise Price per share	$ 5.35
Cancelled or expired, Weighted Average Exercise Price per share	$ 9.24
Ending Balance, Outstanding, Weighted Average Exercise Price per share	$ 10.57	$ 10.73
Exercised, Weighted Average Exercise Price per share	$ 11.21	$ 11.34	$ 11.32
Expected to vest, Weighted Average Exercise Price per share	$ 9.90
Beginning Balance, Outstanding, Weighted Average Remaining Contractual Life	3 years	3 years
Exercisable, Weighted Average Remaining Contractual Life	2 years	2 years	3 years
Expected to vest, Weighted Average Remaining Contractual Life	4 years
Beginning Balance, Outstanding, Aggregate Intrinsic Value	$ 22,172
Ending Balance, Outstanding, Aggregate Intrinsic Value	1,166	22,172
Exercisable, Aggregate Intrinsic Value	770	6,708	1,139
Expected to Vest, Aggregate Intrinsic Value	$ 347