Discontinued Operations - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 15, 2018	Apr. 16, 2017	Apr. 15, 2018	Apr. 16, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Basic (in usd per share)	$ 0.78	$ 0.06	$ 0.75	$ 0.10
Diluted (in usd per share)	$ 0.77	$ 0.05	$ 0.74	$ 0.10
Qdoba
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Company restaurant sales	$ 66,850	$ 98,793	$ 192,620	$ 227,492
Franchise revenues	3,351	4,711	9,337	10,764
Company restaurant costs (excluding depreciation and amortization)	(57,504)	(80,713)	(166,122)	(186,429)
Franchise costs (excluding depreciation and amortization)	(930)	(910)	(2,338)	(2,083)
Selling, general and administrative expenses	(5,848)	(7,956)	(18,112)	(20,385)
Depreciation and amortization expenses	0	(5,057)	(5,012)	(11,752)
Impairment and other charges, net	(594)	(3,811)	(2,263)	(7,715)
Interest expense, net	(1,575)	(2,044)	(4,787)	(4,559)
Operating earnings from discontinued operations before income taxes	3,750	3,013	3,323	5,333
Gain on Qdoba Sale	35,729	0	35,729	0
Earnings from discontinued operations before income taxes	39,479	3,013	39,052	5,333
Income taxes	(16,819)	(1,181)	(17,024)	(2,057)
Earnings from discontinued operations, net of income taxes	$ 22,660	$ 1,832	$ 22,028	$ 3,276
Basic (in usd per share)	$ 0.78	$ 0.06	$ 0.75	$ 0.10
Diluted (in usd per share)	$ 0.77	$ 0.06	$ 0.74	$ 0.10
Term Loan [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Repayments of Debt			$ 260,000
Term Loan [Member] | Qdoba
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Repayments of Debt			$ 260,000