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		6 Months Ended
	Nov. 18, 2020	Mar. 11, 2020	Mar. 11, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net provision (gain) for asset impairments and restaurant closings	$ (85)	$ 661	$ 1,770
Net loss (gain) on disposition of property and equipment	117	$ (2,527)	(2,498)
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 (gain) for asset impairments and restaurant closings	(85)		1,770
Net loss (gain) on disposition of property and equipment	117		(2,498)
Total	$ 32		$ (728)
Effect on EPS:
Basic (in dollars per share)	$ 0		$ 0.02
Assuming dilution (in dollars per share)	$ 0		$ 0.02