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Commitments and Contingencies - Changes to Environmental Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 28, 2021
Aug. 29, 2020
Aug. 31, 2019
Accrual For Environmental Loss Contingencies Roll Forward      
Beginning balance $ 30,702 $ 27,718  
Costs incurred for which reserves have been provided (1,593) (1,160)  
Insurance proceeds 129 111  
Interest accretion 448 537 $ 755
Changes in discount rates (1,040) 1,133  
Revisions in estimates 4,213 2,363  
Ending balance $ 32,859 $ 30,702 $ 27,718