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Derivatives Reconcilation of Gross and Net (Details) - USD ($) $ in Thousands | Aug. 31, 2017 | Aug. 31, 2016
--- | --- | ---
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items] |  |
Derivative Assets | $ 428,930 | $ 543,821
Derivative asset, fair value, gross amount not offset on Balance sheet | 38,716 | 32,876
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 390,214 | 510,945
Derivative Liability, Fair Value, Gross Liability | 330,400 | 513,599
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 3,898 | 811
Derivative liability, fair value, gross amount not offset on balance sheet | 38,716 | 32,876
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 287,786 | 479,912
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] |  |
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items] |  |
Derivative Assets | 9,978 | 22,078
Derivative asset, fair value, gross amount not offset on Balance sheet | 0 | 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 9,978 | 22,078
Derivative Liability, Fair Value, Gross Liability | 707 |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 |
Derivative liability, fair value, gross amount not offset on balance sheet | 0 |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 707 |
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] |  |
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items] |  |
Derivative Assets | 8,771 | 21,551
Derivative asset, fair value, gross amount not offset on Balance sheet | 3,636 | 9,187
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 5,135 | 12,364
Derivative Liability, Fair Value, Gross Liability | 19,931 | 22,289
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 | 0
Derivative liability, fair value, gross amount not offset on balance sheet | 3,636 | 9,187
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 16,295 | 13,102
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] |  |
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability |  | 8
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  | 0
Derivative liability, fair value, gross amount not offset on balance sheet |  | 0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  | 8
Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items] |  |
Derivative Assets | 25,533 |
Derivative asset, fair value, gross amount not offset on Balance sheet | 0 |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 25,533 |
Not Designated as Hedging Instrument [Member] | Commodity and Freight Derivatives [Member] |  |
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items] |  |
Derivative Assets | 384,648 | 500,192
Derivative asset, fair value, gross amount not offset on Balance sheet | 35,080 | 23,689
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 349,568 | 476,503
Derivative Liability, Fair Value, Gross Liability | 309,762 | 491,302
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 3,898 | 811
Derivative liability, fair value, gross amount not offset on balance sheet | 35,080 | 23,689
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | $ 270,784 | $ 466,802

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