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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, 2018 | Aug. 31, 2017
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Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items] |  |
Gross Amounts Recognized | $ 352,029 | $ 249,661
Derivative asset, fair value, gross amount not offset on Balance sheet | 35,484 | 38,548
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 316,545 | 211,113
Derivative Liability, Fair Value, Gross Liability | 445,755 | 313,261
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 12,983 | 3,898
Derivative liability, fair value, gross amount not offset on balance sheet | 35,484 | 38,548
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 397,288 | 270,815
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 | 313,033 | 215,349
Derivative asset, fair value, gross amount not offset on Balance sheet | 26,781 | 34,912
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 286,252 | 180,437
Derivative Liability, Fair Value, Gross Liability | 421,054 | 293,330
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 12,983 | 3,898
Derivative liability, fair value, gross amount not offset on balance sheet | 26,781 | 34,912
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 381,290 | 254,520
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 | 15,401 | 8,779
Derivative asset, fair value, gross amount not offset on Balance sheet | 8,703 | 3,636
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 6,698 | 5,143
Derivative Liability, Fair Value, Gross Liability | 24,701 | 19,931
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 | 0
Derivative liability, fair value, gross amount not offset on balance sheet | 8,703 | 3,636
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 15,998 | 16,295
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 | 23,595 | 25,533
Derivative asset, fair value, gross amount not offset on Balance sheet | 0 | 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | $ 23,595 | $ 25,533

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