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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, 2024
Aug. 31, 2023
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Gross Amounts Recognized $ 174,738 $ 312,842
Derivative asset, fair value, gross amount not offset on Balance sheet 9,622 17,196
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 165,116 295,646
Derivative Liability, Fair Value, Gross Liability 246,279 362,930
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 1,601 1,505
Derivative liability, fair value, gross amount not offset on balance sheet 9,622 17,196
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 235,056 344,229
Not Designated as Hedging Instrument | Commodity derivatives    
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Gross Amounts Recognized 165,709 280,440
Derivative asset, fair value, gross amount not offset on Balance sheet 2,522 4,866
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 163,187 275,574
Derivative Liability, Fair Value, Gross Liability 221,803 349,131
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 1,601 1,505
Derivative liability, fair value, gross amount not offset on balance sheet 2,522 4,866
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 217,680 342,760
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]    
Gross Amounts Recognized 9,029 32,402
Derivative asset, fair value, gross amount not offset on Balance sheet 7,100 12,330
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 1,929 20,072
Derivative Liability, Fair Value, Gross Liability 24,476 13,799
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 0
Derivative liability, fair value, gross amount not offset on balance sheet 7,100 12,330
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ 17,376 $ 1,469