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Derivatives Reconcilation of Gross and Net (Details) - USD ($)
$ in Thousands
Aug. 31, 2015
Aug. 31, 2014
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Derivative Assets $ 513,441 $ 603,933
Derivative asset, fair value, gross amount not offset on Balance sheet 70,083 43,403
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 443,358 560,530
Derivative Liability, Fair Value, Gross Liability 470,769 599,990
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 11,482 2,504
Derivative liability, fair value, gross amount not offset on balance sheet (70,083) (43,403)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 389,204 554,083
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 14,216 4,200
Derivative asset, fair value, gross amount not offset on Balance sheet 0 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 14,216 4,200
Derivative Liability, Fair Value, Gross Liability 6,058  
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 6,058  
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 23,154 2,523
Derivative asset, fair value, gross amount not offset on Balance sheet 11,682 1,174
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 11,472 1,349
Derivative Liability, Fair Value, Gross Liability 37,598 2,248
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 0
Derivative liability, fair value, gross amount not offset on balance sheet (11,682) (1,174)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 25,916 1,074
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 61 130
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 0
Derivative liability, fair value, gross amount not offset on balance sheet 0 0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 61 130
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 476,071 597,210
Derivative asset, fair value, gross amount not offset on Balance sheet 58,401 42,229
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 417,670 554,981
Derivative Liability, Fair Value, Gross Liability 427,052 597,612
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 11,482 2,504
Derivative liability, fair value, gross amount not offset on balance sheet (58,401) (42,229)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ 357,169 $ 552,879