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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, 2019 | Aug. 31, 2018
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Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items] |  |
Gross Amounts Recognized | $ 246,728 | $ 352,029
Derivative asset, fair value, gross amount not offset on Balance sheet | 65,834 | 35,484
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 180,894 | 316,545
Derivative Liability, Fair Value, Gross Liability | 244,019 | 445,755
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 4,191 | 12,983
Derivative liability, fair value, gross amount not offset on balance sheet | 48,755 | 35,484
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 191,073 | 397,288
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 | 215,030 | 313,033
Derivative asset, fair value, gross amount not offset on Balance sheet | 58,726 | 26,781
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 156,304 | 286,252
Derivative Liability, Fair Value, Gross Liability | 223,410 | 421,054
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 4,191 | 12,983
Derivative liability, fair value, gross amount not offset on balance sheet | 41,647 | 26,781
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 177,572 | 381,290
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 | 10,334 | 15,401
Derivative asset, fair value, gross amount not offset on Balance sheet | 7,108 | 8,703
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 3,226 | 6,698
Derivative Liability, Fair Value, Gross Liability | 20,609 | 24,701
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 | 0
Derivative liability, fair value, gross amount not offset on balance sheet | 7,108 | 8,703
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 13,501 | 15,998
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 | 21,364 | 23,595
Derivative asset, fair value, gross amount not offset on Balance sheet | 0 | 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | $ 21,364 | $ 23,595

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