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. 29, 2018	Aug. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property and equipment	$ 19,469	$ 3,372
Assets related to discontinued operations—non-current	1,813	2,755
Liabilities related to discontinued operations—current	14	367
Liabilities related to discontinued operations—non-current	16	16
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property and equipment	1,813	1,872
Deferred tax assets	0	883
Assets related to discontinued operations—non-current	1,813	2,755
Deferred income taxes	0	354
Accrued expenses and other liabilities	14	13
Liabilities related to discontinued operations—current	14	367
Other liabilities	16	16
Liabilities related to discontinued operations—non-current	$ 16	$ 16