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Asset Retirement Obligations - Reconciliation of Asset Retirement Liability (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 30, 2019
Nov. 24, 2018
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning balance $ 12,727  
Accretion expense 232 $ 220
Effect of exchange rate changes 29  
Ending balance $ 12,988