Impairment of Long-Lived Assets, Discontinued Operations, Property Held for Sale and Store Closings - Impairment Charges to Income from Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	4 Months Ended
	Nov. 18, 2020	Dec. 18, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net provision for asset impairments and restaurant closings	$ (85)	$ 1,110
Net loss on disposition of property and equipment	117	30
Disposal Group, Disposed of by Sale, Not Discontinued Operation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net provision for asset impairments and restaurant closings	(85)	1,110
Net loss on disposition of property and equipment	117	30
Total	$ 32	$ 1,140
Effect on EPS:
Basic (in dollars per share)	$ 0	$ (0.04)
Assuming dilution (in dollars per share)	$ 0	$ (0.04)