Discontinued Operations - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	4 Months Ended
	Jan. 20, 2019	Jan. 21, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Basic (in usd per share)	$ 0.11	$ (0.02)
Diluted (in usd per share)	$ 0.11	$ (0.02)
Qdoba
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Company restaurant sales	$ 0	$ 125,770
Franchise revenues	0	5,986
Company restaurant costs (excluding depreciation and amortization)	0	(108,618)
Franchise costs (excluding depreciation and amortization)	0	(1,408)
Selling, general and administrative expenses	302	(12,264)
Depreciation and amortization expenses	0	(5,012)
Impairment and other charges, net	0	(1,669)
Interest expense, net	0	(3,212)
Operating earnings from discontinued operations before income taxes	302	(427)
Gain (loss) on Qdoba Sale	(85)	0
Earnings (losses) from discontinued operations before income taxes	217	(427)
Income taxes	2,760	(205)
Earnings (losses) from discontinued operations, net of income taxes	$ 2,977	$ (632)
Basic (in usd per share)	$ 0.11	$ (0.02)
Diluted (in usd per share)	$ 0.11	$ (0.02)