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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 | Nov. 30, 2020 | 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 | $ 674,702 | $ 358,300
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 665,037 | 345,935
Derivative Liability, Fair Value, Gross Liability | 564,364 | 412,809
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 545,398 | 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 | 642,455 | 327,493
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 640,419 | 324,513
Derivative Liability, Fair Value, Gross Liability | 519,909 | 343,343
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 508,572 | 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 | 16,684 | 11,809
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 9,055 | 2,424
Derivative Liability, Fair Value, Gross Liability | 44,455 | 69,466
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 36,826 | 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 | 15,563 | 18,998
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | $ 15,563 | $ 18,998

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