DERIVATIVES (Derivatives Not Designated as Hedging Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2020	Nov. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on commodity derivatives accounted for as cash flow hedging instruments	$ 1,164	$ 714
Commodity
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on commodity derivatives accounted for as cash flow hedging instruments	1,200	700
Commodity | Cost of goods sold
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) before income taxes for derivatives not designated as hedges	$ (5,600)	$ (1,300)