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Commitments and Contingencies - Changes to Environmental Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended
May 30, 2020
May 25, 2019
Accrual For Environmental Loss Contingencies Roll Forward    
Beginning balance $ 27,718  
Revisions in estimates 1,200  
Costs incurred for which reserves have been provided (961)  
Insurance proceeds 90  
Accretion on environmental contingencies 403 $ 566
Changes in discount rates 1,426  
Ending balance $ 29,876