Discontinued Operations - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 07, 2019	Jul. 08, 2018	Jul. 07, 2019	Jul. 08, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Basic (in usd per share)	$ (0.01)	$ (0.10)	$ 0.10	$ 0.66
Diluted (in usd per share)	$ (0.01)	$ (0.10)	$ 0.10	$ 0.65
Qdoba
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Company restaurant sales	$ 0	$ 0	$ 0	$ 192,620
Franchise revenues	0	0	0	9,337
Company restaurant costs (excluding depreciation and amortization)	0	0	0	(166,122)
Franchise costs (excluding depreciation and amortization)	0	0	0	(2,338)
Selling, general and administrative expenses	(120)	(202)	123	(18,314)
Depreciation and amortization expenses	0	0	0	(5,012)
Impairment and other charges, net	(262)	(123)	(262)	(2,386)
Interest expense, net	0	0	0	(4,787)
Operating (losses) earnings from discontinued operations before income taxes	(382)	(325)	(139)	2,998
Gain (loss) on Qdoba Sale	0	(3,648)	(85)	32,081
(Losses) earnings from discontinued operations before income taxes	(382)	(3,973)	(224)	35,079
Income taxes	98	1,097	2,876	(15,927)
(Losses) earnings from discontinued operations, net of income taxes	$ (284)	$ (2,876)	$ 2,652	$ 19,152
Basic (in usd per share)	$ (0.01)	$ (0.10)	$ 0.10	$ 0.66
Diluted (in usd per share)	$ (0.01)	$ (0.10)	$ 0.10	$ 0.65