Income Taxes - Reconciliation of the Statutory Federal Income Tax Rate to the Company's Effective Income Tax Rate (Detail)	12 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 24, 2011
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	(35.00%)	35.00%	35.00%
State income taxes, net of federal benefit	(5.20%)	2.30%	2.80%
Other permanent differences	2.40%	0.60%	1.40%
Adjustment of prior year accruals	1.80%	0.20%	1.20%
Uncertain tax positions	3.70%	0.00%	(0.30%)
Credits	(29.30%)	(1.20%)	(2.90%)
Change in valuation allowances	(9.00%)	(0.10%)	3.20%
Foreign rate differential	(3.60%)	(0.10%)	0.40%
Effective income tax rate (benefit)	(74.20%)	36.70%	40.80%