Impairment of Long-Lived Assets, Discontinued Operations, Property Held for Sale and Store Closings - 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
Liabilities related to discontinued operations—current	$ 17
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property held for sale		$ 1,715
Assets related to discontinued operations—non-current		1,715
Accrued expenses and other liabilities		17
Liabilities related to discontinued operations—current		$ 17