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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, 2023
Aug. 31, 2022
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 483,141 $ 517,090
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 465,532 504,355
Derivative Liability, Fair Value, Gross Liability 366,239 390,940
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 339,218 368,041
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 443,518 464,167
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 436,724 460,333
Derivative Liability, Fair Value, Gross Liability 352,978 378,291
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 336,772 364,293
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 39,623 52,923
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 28,808 44,022
Derivative Liability, Fair Value, Gross Liability 13,261 12,649
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ 2,446 $ 3,748