Impairment of Long-Lived Assets, Store Closings, Discontinued Operations and Property Held for Sale - Schedule of Abandoned Leased Facilities (Details) - USD ($) $ in Thousands	Aug. 26, 2020	Aug. 29, 2019	Aug. 28, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating lease liabilities - current	$ 3,903	$ 8,061
Operating lease liabilities - non-current	17,797	24,360
Accrued expenses and other liabilities	19,569	$ 23,473	$ 24,475
Discontinued Operations, Abandonment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating lease liabilities - current	365
Operating lease liabilities - non-current	2,348
Accrued expenses and other liabilities	2,088		1,441
Accrued lease termination expense	$ 4,801		$ 1,441