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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
Nov. 30, 2022
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 $ 366,831 $ 517,090
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 351,667 504,355
Derivative Liability, Fair Value, Gross Liability 239,613 390,940
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 220,934 368,041
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 315,322 464,167
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 307,530 460,333
Derivative Liability, Fair Value, Gross Liability 225,676 378,291
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 214,369 364,293
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 51,509 52,923
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 44,137 44,022
Derivative Liability, Fair Value, Gross Liability 13,937 12,649
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ 6,565 $ 3,748