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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, 2022
Aug. 31, 2021
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Gross Amounts Recognized $ 517,090 $ 568,749
Derivative asset, fair value, gross amount not offset on Balance sheet 12,735 9,756
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 504,355 558,993
Derivative Liability, Fair Value, Gross Liability 390,940 453,367
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 1,424 2,485
Derivative liability, fair value, gross amount not offset on balance sheet 21,475 9,756
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 368,041 441,126
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 464,167 532,832
Derivative asset, fair value, gross amount not offset on Balance sheet 3,834 4,174
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 460,333 528,658
Derivative Liability, Fair Value, Gross Liability 378,291 444,861
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 1,424 2,485
Derivative liability, fair value, gross amount not offset on balance sheet 12,574 4,174
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 364,293 438,202
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 52,923 19,429
Derivative asset, fair value, gross amount not offset on Balance sheet 8,901 5,582
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 44,022 13,847
Derivative Liability, Fair Value, Gross Liability 12,649 8,506
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 0
Derivative liability, fair value, gross amount not offset on balance sheet 8,901 5,582
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ 3,748 2,924
Not Designated as Hedging Instrument | Other derivatives    
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Gross Amounts Recognized   16,488
Derivative asset, fair value, gross amount not offset on Balance sheet   0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral   $ 16,488