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Commitments and Contingencies - Schedule of Environmental Liabilities (Details) - USD ($)
$ in Thousands
6 Months Ended
Feb. 28, 2019
Aug. 31, 2018
Accrual for Environmental Loss Contingencies [Roll Forward]    
Beginning Balance $ 53,832  
Liabilities Established (Released), Net 1,487  
Payments and Other (2,105)  
Ending Balance 53,214  
Short-Term 9,908 $ 6,682
Long-Term $ 43,306 $ 47,150