Impairment of Long-Lived Assets, Store Closings, Discontinued Operations and Property Held for Sale - Discontinued Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Aug. 26, 2020	Jun. 03, 2020	Mar. 11, 2020	Aug. 28, 2019	Jun. 05, 2019	Mar. 13, 2019	Dec. 18, 2019	Dec. 19, 2018	Aug. 26, 2020	Aug. 28, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations, net of income taxes	$ (5)	$ (7)	$ (6)	$ 12	$ (6)	$ (8)	$ (11)	$ (5)	$ (29)	$ (7)
Effect on EPS from discontinued operations—decrease—basic (in dollars per share)									$ 0.00	$ 0.00
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operating losses									$ (29)	$ (7)
Net loss									(29)	(7)
Income tax benefit (expense) from discontinued operations									0	0
Loss from discontinued operations, net of income taxes									$ (29)	$ (7)
Effect on EPS from discontinued operations—decrease—basic (in dollars per share)									$ 0.00	$ 0.00