Impairment of Long-Lived Assets, Store Closings, Discontinued Operations and Property Held for Sale - Impairment Charges to Income from Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Nov. 18, 2020	Aug. 25, 2021	Aug. 26, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net provision for (gain on) asset impairments and restaurant closings	$ (85)		$ 10,193
Net loss (gain) on disposition of property and equipment	$ 117		(11,557)
Disposal Group, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net provision for (gain on) asset impairments and restaurant closings		$ (85)	10,193
Net loss (gain) on disposition of property and equipment		117	(11,557)
Total		$ 32	$ (1,364)
Effect on EPS:
Basic (in dollars per share)		$ 0	$ 0.05
Assuming dilution (in dollars per share)		$ 0	$ 0.05