DERIVATIVES (Commodity Contract Commitments) (Details) MWh in Thousands	9 Months Ended
	May 31, 2023 MWh MMBTU t
Aluminum | Long
Derivative [Line Items]
Commodity contract commitments	3,675
Aluminum | Short
Derivative [Line Items]
Commodity contract commitments	1,775
Copper | Long
Derivative [Line Items]
Commodity contract commitments	828
Copper | Short
Derivative [Line Items]
Commodity contract commitments	7,564
Electricity | Long
Derivative [Line Items]
Commodity contract commitment, energy | MWh	3,354
Natural Gas | Long
Derivative [Line Items]
Commodity contract commitment, energy | MMBTU	4,790,450