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Commitments and Contingencies - Changes to Environmental Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended
May 29, 2021
May 30, 2020
Accrual For Environmental Loss Contingencies Roll Forward    
Beginning balance $ 30,702  
Revisions in estimates (174)  
Costs incurred for which reserves have been provided (1,016)  
Insurance proceeds 111  
Accretion on environmental contingencies 336 $ 403
Changes in discount rates (1,865)  
Ending balance $ 28,094