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Asset Retirement Obligations - Reconciliation of Asset Retirement Liability (Details) - USD ($)
$ in Thousands
6 Months Ended
Feb. 27, 2021
Feb. 29, 2020
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning balance $ 13,920  
Accretion expense 492 $ 463
Effect of exchange rate changes 61  
Ending balance $ 14,473