DERIVATIVES - Commodity Contract Commitments (Details)	12 Months Ended
	Aug. 31, 2023 MMBTU MWh t
Aluminum | Long
Derivative [Line Items]
Commodity contract commitments	2,850
Aluminum | Short
Derivative [Line Items]
Commodity contract commitments	1,400
Copper | Long
Derivative [Line Items]
Commodity contract commitments	147
Copper | Short
Derivative [Line Items]
Commodity contract commitments	8,459
Electricity | Long
Derivative [Line Items]
Energy contract commitments | MWh	3,312,000
Natural Gas | Long
Derivative [Line Items]
Energy contract commitments | MMBTU	5,270,500