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Commitments and Contingencies - Schedule of Environmental Liabilities (Details) - USD ($)
$ in Thousands
6 Months Ended
Feb. 29, 2016
Aug. 31, 2015
Accrual for Environmental Loss Contingencies [Roll Forward]    
Beginning balance $ 46,793  
Liabilities Established (Released), Net (178)  
Payments and Other (839)  
Ending balance 45,776  
Short-Term 882 $ 924
Long-Term 44,894 $ 45,869
Auto and Metals Recycling    
Accrual for Environmental Loss Contingencies [Roll Forward]    
Beginning balance 46,494  
Liabilities Established (Released), Net (178)  
Payments and Other (810)  
Ending balance 45,506  
Short-Term 732  
Long-Term 44,774  
Corporate    
Accrual for Environmental Loss Contingencies [Roll Forward]    
Beginning balance 299  
Liabilities Established (Released), Net 0  
Payments and Other (29)  
Ending balance 270  
Short-Term 150  
Long-Term $ 120