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Derivative Financial Instruments and Hedging Activities - Gross Fair Values of Derivative Assets, Derivative Liabilities, and Margin Deposits (Cash Collateral) (Details) - USD ($)
$ in Thousands
Feb. 28, 2025
Aug. 31, 2024
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 190,489 $ 174,738
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 173,601 165,116
Derivative Liability, Fair Value, Gross Liability 208,322 246,279
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 190,884 235,056
Not Designated as Hedging Instrument | Commodity derivatives    
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Derivative Asset, Fair Value, Gross Asset 170,511 165,709
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 169,761 163,187
Derivative Liability, Fair Value, Gross Liability 177,591 221,803
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 176,291 217,680
Not Designated as Hedging Instrument | Foreign exchange derivatives    
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Derivative Asset, Fair Value, Gross Asset 19,978 9,029
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 3,840 1,929
Derivative Liability, Fair Value, Gross Liability 30,731 24,476
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ 14,593 $ 17,376