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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 | Aug. 31, 2020 | Aug. 31, 2019
--- | --- | ---
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items] |  |
Gross Amounts Recognized | $ 358,300 | $ 246,728
Derivative asset, fair value, gross amount not offset on Balance sheet | 12,365 | 65,834
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 345,935 | 180,894
Derivative Liability, Fair Value, Gross Liability | 412,809 | 244,019
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 956 | 4,191
Derivative liability, fair value, gross amount not offset on balance sheet | 14,963 | 48,755
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 396,890 | 191,073
Not Designated as Hedging Instrument | Commodity derivatives |  |
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items] |  |
Gross Amounts Recognized | 327,493 | 215,030
Derivative asset, fair value, gross amount not offset on Balance sheet | 2,980 | 58,726
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 324,513 | 156,304
Derivative Liability, Fair Value, Gross Liability | 343,343 | 223,410
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 956 | 4,191
Derivative liability, fair value, gross amount not offset on balance sheet | 5,578 | 41,647
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 336,809 | 177,572
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] |  |
Gross Amounts Recognized | 11,809 | 10,334
Derivative asset, fair value, gross amount not offset on Balance sheet | 9,385 | 7,108
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 2,424 | 3,226
Derivative Liability, Fair Value, Gross Liability | 69,466 | 20,609
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 | 0
Derivative liability, fair value, gross amount not offset on balance sheet | 9,385 | 7,108
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 60,081 | 13,501
Not Designated as Hedging Instrument | Embedded derivative asset |  |
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items] |  |
Gross Amounts Recognized | 18,998 | 21,364
Derivative asset, fair value, gross amount not offset on Balance sheet | 0 | 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | $ 18,998 | $ 21,364

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