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Commitments and Contingencies - Changes to Environmental Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 27, 2022
Aug. 28, 2021
Aug. 29, 2020
Accrual For Environmental Loss Contingencies Roll Forward      
Beginning balance $ 32,859 $ 30,702  
Costs incurred for which reserves have been provided (2,188) (1,593)  
Insurance proceeds 135 129  
Interest accretion 596 448 $ 537
Changes in discount rates (3,235) (1,040)  
Revisions in estimates 4,024 4,213  
Ending balance $ 32,191 $ 32,859 $ 30,702
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Accounts Payable and Accrued Liabilities, Noncurrent