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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
Aug. 31, 2023
Aug. 31, 2022
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Gross Amounts Recognized $ 312,842 $ 517,090
Derivative asset, fair value, gross amount not offset on Balance sheet 17,196 12,735
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 295,646 504,355
Derivative Liability, Fair Value, Gross Liability 362,930 390,940
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 1,505 1,424
Derivative liability, fair value, gross amount not offset on balance sheet 17,196 21,475
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 344,229 368,041
Not Designated as Hedging Instrument | Commodity derivatives    
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Gross Amounts Recognized 280,440 464,167
Derivative asset, fair value, gross amount not offset on Balance sheet 4,866 3,834
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 275,574 460,333
Derivative Liability, Fair Value, Gross Liability 349,131 378,291
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 1,505 1,424
Derivative liability, fair value, gross amount not offset on balance sheet 4,866 12,574
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 342,760 364,293
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]    
Gross Amounts Recognized 32,402 52,923
Derivative asset, fair value, gross amount not offset on Balance sheet 12,330 8,901
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 20,072 44,022
Derivative Liability, Fair Value, Gross Liability 13,799 12,649
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 0
Derivative liability, fair value, gross amount not offset on balance sheet 12,330 8,901
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ 1,469 $ 3,748