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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, 2021 | Aug. 31, 2020
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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 | $ 1,003,227 | $ 358,300
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 978,487 | 345,935
Derivative Liability, Fair Value, Gross Liability | 579,671 | 412,809
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 551,923 | 396,890
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 | 980,141 | 327,493
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 961,292 | 324,513
Derivative Liability, Fair Value, Gross Liability | 515,002 | 343,343
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 493,145 | 336,809
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 | 7,221 | 11,809
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 1,330 | 2,424
Derivative Liability, Fair Value, Gross Liability | 64,669 | 69,466
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 58,778 | 60,081
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 | 15,865 | 18,998
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | $ 15,865 | $ 18,998

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