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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
May 31, 2024
Aug. 31, 2023
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 207,893 $ 312,842
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 196,675 295,646
Derivative Liability, Fair Value, Gross Liability 202,608 362,930
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 188,234 344,229
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 194,035 280,440
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 192,941 275,574
Derivative Liability, Fair Value, Gross Liability 180,016 349,131
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 175,766 342,760
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 13,858 32,402
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 3,734 20,072
Derivative Liability, Fair Value, Gross Liability 22,592 13,799
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ 12,468 $ 1,469