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DERIVATIVES AND RISK MANAGEMENT (Derivative Liabilities) (Details) - USD ($)
$ in Thousands
May 31, 2018
Aug. 31, 2017
Derivatives, Fair Value [Line Items]    
Derivative liabilities (accrued expenses and other payables) $ 1,630 $ 8,510
Commodity | Not designated    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (accrued expenses and other payables) 80 3,251
Foreign exchange | Designated    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (accrued expenses and other payables) 0 1,549
Foreign exchange | Not designated    
Derivatives, Fair Value [Line Items]    
Derivative liabilities (accrued expenses and other payables) $ 1,550 $ 3,710