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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, 2025
Aug. 31, 2024
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Gross Amounts Recognized $ 174,018 $ 174,738
Derivative asset, fair value, gross amount not offset on Balance sheet 20,094 9,622
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 153,924 165,116
Derivative Liability, Fair Value, Gross Liability 177,893 246,279
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 232 1,601
Derivative liability, fair value, gross amount not offset on balance sheet 20,094 9,622
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 157,567 235,056
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 130,491 165,709
Derivative asset, fair value, gross amount not offset on Balance sheet 10,715 2,522
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 119,776 163,187
Derivative Liability, Fair Value, Gross Liability 166,122 221,803
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 232 1,601
Derivative liability, fair value, gross amount not offset on balance sheet 10,715 2,522
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 155,175 217,680
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 43,527 9,029
Derivative asset, fair value, gross amount not offset on Balance sheet 9,379 7,100
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 34,148 1,929
Derivative Liability, Fair Value, Gross Liability 11,771 24,476
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 0
Derivative liability, fair value, gross amount not offset on balance sheet 9,379 7,100
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ 2,392 $ 17,376