Impairment of Long-Lived Assets, Store Closings, Discontinued Operations and Property Held for Sale - Assets and Liabilities for All Discontinued Operations (Details) - USD ($) $ in Thousands	Aug. 26, 2020	Aug. 28, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets related to discontinued operations—non-current	$ 1,715	$ 1,813
Liabilities related to discontinued operations—current	17	14
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property and equipment	1,715	1,813
Assets related to discontinued operations—non-current	1,715	1,813
Accrued expenses and other liabilities	17	14
Liabilities related to discontinued operations—current	$ 17	$ 14