DERIVATIVES (Commodity Contract Commitments) (Details) MWh in Thousands	9 Months Ended
	May 31, 2022 MMBTU MWh t
Aluminum | Long
Derivative [Line Items]
Commodity contract commitments	3,300
Aluminum | Short
Derivative [Line Items]
Commodity contract commitments	1,525
Copper | Long
Derivative [Line Items]
Commodity contract commitments	975
Copper | Short
Derivative [Line Items]
Commodity contract commitments	8,482
Electricity | Long
Derivative [Line Items]
Commodity contract commitment, energy | MWh	1,717
Natural Gas | Long
Derivative [Line Items]
Commodity contract commitment, energy | MMBTU	4,870,250