DERIVATIVES (Commodity Contract Commitments) (Details) MWh in Thousands	9 Months Ended
	May 31, 2024 MWh MMBTU t
Aluminum | Long
Derivative [Line Items]
Commodity contract commitments	3,350
Aluminum | Short
Derivative [Line Items]
Commodity contract commitments	1,525
Copper | Long
Derivative [Line Items]
Commodity contract commitments	771
Copper | Short
Derivative [Line Items]
Commodity contract commitments	11,385
Electricity | Long
Derivative [Line Items]
Commodity contract commitment, energy | MWh	3,153
Natural Gas | Long
Derivative [Line Items]
Commodity contract commitment, energy | MMBTU	5,210,650