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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
Feb. 29, 2024
Aug. 31, 2023
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 268,317 $ 312,842
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 252,469 295,646
Derivative Liability, Fair Value, Gross Liability 278,496 362,930
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 261,074 344,229
Not Designated as Hedging Instrument | Commodity derivatives    
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Derivative Asset, Fair Value, Gross Asset 251,437 280,440
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 239,385 275,574
Derivative Liability, Fair Value, Gross Liability 274,317 349,131
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 260,691 342,760
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]    
Derivative Asset, Fair Value, Gross Asset 16,880 32,402
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 13,084 20,072
Derivative Liability, Fair Value, Gross Liability 4,179 13,799
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ 383 $ 1,469