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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, 2022 | Aug. 31, 2021
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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 | $ 885,009 | $ 568,749
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 867,675 | 558,993
Derivative Liability, Fair Value, Gross Liability | 573,049 | 453,367
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 554,037 | 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 | 804,483 | 532,832
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 793,251 | 528,658
Derivative Liability, Fair Value, Gross Liability | 566,818 | 444,861
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 553,908 | 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 | 67,239 | 19,429
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 61,137 | 13,847
Derivative Liability, Fair Value, Gross Liability | 6,231 | 8,506
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 129 | 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 | 13,287 | 16,488
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | $ 13,287 | $ 16,488

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