Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Sep. 29, 2012 item	Sep. 24, 2011	Sep. 25, 2010	Jun. 29, 2012 sqft
Legal Proceedings
Total rent expense	$ 25,100,000	$ 18,100,000	$ 9,200,000
Sublease income	300,000	300,000	30,000
Initial term of capital lease	15 years
Number of additional optional renewals of capital lease	6
Capital leases optional renewal term	5 years
Area of space under construction				425,000
Properties under construction				4,100,000
Capital Leases
2013	6,587,000
2014	6,906,000
2015	6,906,000
2016	6,139,000
2017	3,838,000
Thereafter	35,817,000
Total	66,193,000
Less: amount representing interest	(22,699,000)
Present value of future minimum lease payments	43,494,000
Operating Leases
2013	17,101,000
2014	14,388,000
2015	13,115,000
2016	9,092,000
2017	6,502,000
Thereafter	22,755,000
Total	82,953,000
Subleases
2013	(1,242,000)
2014	(1,169,000)
2015	(1,160,000)
2016	(999,000)
2017	(697,000)
Thereafter	(1,964,000)
Total minimum income	(7,231,000)
Financing Obligations
2013	816,000
2014	2,213,000
2015	8,660,000
2016	9,581,000
2017	9,581,000
Thereafter	123,399,000
Total	$ 154,250,000
Maximum
Legal Proceedings
Operating leases term	20 years
Minimum
Legal Proceedings
Operating leases term	1 year