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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. 28, 2023 | Aug. 31, 2022
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Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | $ 448,564 | $ 517,090
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 432,810 | 504,355
Derivative Liability, Fair Value, Gross Liability | 299,868 | 390,940
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 282,638 | 368,041
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 | 391,602 | 464,167
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 383,122 | 460,333
Derivative Liability, Fair Value, Gross Liability | 288,612 | 378,291
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 278,656 | 364,293
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 | 56,962 | 52,923
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 49,688 | 44,022
Derivative Liability, Fair Value, Gross Liability | 11,256 | 12,649
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | $ 3,982 | $ 3,748

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