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Commitments and Contingencies - Changes to Environmental Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 30, 2019
Nov. 24, 2018
Accrual For Environmental Loss Contingencies Roll Forward    
Beginning balance $ 27,718  
Revisions in estimates 1,200  
Costs incurred for which reserves have been provided (229)  
Insurance proceeds 31  
Accretion on environmental contingencies 134 $ 189
Changes in discount rates (602)  
Ending balance $ 28,252