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DERIVATIVES (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Aug. 31, 2020
Derivative [Line Items]          
Unrealized holding gain (loss) $ 7,723 $ (3,646) $ 8,887 $ (2,932)  
Foreign exchange          
Derivative [Line Items]          
Derivative notional amount 165,800   165,800   $ 138,500
Commodity          
Derivative [Line Items]          
Derivative notional amount $ 217,200   $ 217,200   $ 195,800