DERIVATIVES (Commodity Contract Commitments) (Details) MWh in Thousands	6 Months Ended
	Feb. 28, 2022 MMBTU MWh t
Aluminum | Long
Derivative [Line Items]
Commodity contract commitments	3,675
Aluminum | Short
Derivative [Line Items]
Commodity contract commitments	2,150
Copper | Long
Derivative [Line Items]
Commodity contract commitments	431
Copper | Short
Derivative [Line Items]
Commodity contract commitments	9,662
Electricity | Long
Derivative [Line Items]
Commodity contract commitment, energy | MWh	1,767
Natural Gas | Long
Derivative [Line Items]
Commodity contract commitment, energy | MMBTU	4,890,200