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Commitments and Contingencies - Changes to Environmental Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 29, 2020
Aug. 31, 2019
Aug. 25, 2018
Accrual For Environmental Loss Contingencies Roll Forward      
Beginning balance $ 27,718 $ 25,486  
Costs incurred for which reserves have been provided (1,160) (1,079)  
Insurance proceeds 111 143  
Interest accretion 537 755 $ 692
Changes in discount rates 1,133 2,239  
Revisions in estimates 2,363 174  
Ending balance $ 30,702 $ 27,718 $ 25,486