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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
May 31, 2022
Aug. 31, 2021
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 890,516 $ 568,749
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 854,091 558,993
Derivative Liability, Fair Value, Gross Liability 625,117 453,367
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 586,878 441,126
Not Designated as Hedging Instrument | Commodity derivatives    
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Derivative Asset, Fair Value, Gross Asset 762,167 532,832
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 741,152 528,658
Derivative Liability, Fair Value, Gross Liability 609,663 444,861
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 586,834 438,202
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]    
Derivative Asset, Fair Value, Gross Asset 114,804 19,429
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 99,394 13,847
Derivative Liability, Fair Value, Gross Liability 15,454 8,506
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 44 2,924
Not Designated as Hedging Instrument | Embedded Derivative Financial Instruments [Member]    
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Derivative Asset, Fair Value, Gross Asset 13,545 16,488
Derivative Asset, Fair Value, Amount Not Offset Against Collateral $ 13,545 $ 16,488