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Commitments and Contingencies - Changes to Environmental Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2019
Aug. 25, 2018
Aug. 26, 2017
Accrual For Environmental Loss Contingencies Roll Forward      
Beginning balance $ 25,486 $ 25,419  
Costs incurred for which reserves have been provided (1,079) (1,016)  
Insurance proceeds 143 140  
Interest accretion 755 692 $ 600
Changes in discount rates 2,239 (494)  
Revisions in estimates 174 745  
Ending balance $ 27,718 $ 25,486 $ 25,419