Discontinued Operations (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 27, 2015 USD ($) center $ / shares	Sep. 28, 2014 USD ($) restaurant $ / shares	Sep. 29, 2013 USD ($) $ / shares
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment charges	$ (557)	$ (570)	$ (3,874)
number of distribution center leases assigned to third parties | center	1
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	$ (3,789)	$ (5,894)	$ (31,456)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share | $ / shares	$ (0.10)	$ (0.14)	$ (0.73)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share | $ / shares	$ (0.10)	$ (0.14)	$ (0.70)
Discontinued Operation - Distribution Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Future Lease Commitments Net of Straightline Rent and Tenant Improvement Reversals	$ (200)	$ (300)	$ (1,600)
Reversal of Tenant Improvement Allowances and Deferred Rent			400
Restructuring Reserve	$ 200	500
Number of Distribution Centers | center	1
Revenue	$ 0	0	37,743
Operating loss before income tax benefit	(703)	(1,276)	(6,446)
Accelerated depreciation			1,900
Disposal Group, Including Discontinued Operation, Vendor Contract Exit Costs			1,200
Workers' Compensation Liability	$ 500	900	1,300
2013 Qdoba Closures [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Terminated Lease Agreements	5
Asset impairment charges	$ 0	(2,170)	(22,239)
Disposal Group, Including Discontinued Operation, Future Lease Commitments Net of Straightline Rent and Tenant Improvement Reversals	(4,594)	(4,536)	(10,301)
Provision for Doubtful Accounts	(366)	0	0
Reversal of Tenant Improvement Allowances and Deferred Rent			4,300
Disposal group, Including Discontinued Operations, Brokerage Commissions	(234)	(652)	0
Restructuring Reserve	4,256	5,737
Revenue	0	0	28,036
Operating loss before income tax benefit	0	$ 0	(8,961)
Number of Restaurants | restaurant		62
Restructuring Reserve, Accrual Adjustment	4,594
Cash paid to settle restructuring reserve	(6,075)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	(5,496)	$ (8,247)	(44,576)
Disposal Group, Including Discontinued Operation, Other Expense	$ (302)	$ (889)	$ (3,075)
Locations Subleased at a Loss	6
Locations Marketed for Sublease	15