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Impairment of Long-Lived Assets, Store Closings, Discontinued Operations and Property Held for Sale - Rollforward of Property Held for Sale (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 26, 2020
Aug. 28, 2019
Movement in Property, Plant and Equipment [Roll Forward]    
Beginning balance $ 265,279  
Ending balance 241,773 $ 265,279
Property held for sale    
Movement in Property, Plant and Equipment [Roll Forward]    
Beginning balance 16,488 19,469
Disposals (9,590) (6,036)
Net transfers to property held for sale 4,351 3,055
Ending balance $ 11,249 $ 16,488