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Derivatives Reconcilation of Gross and Net (Details) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2014
Aug. 31, 2013
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Derivative Assets $ 603,933 $ 499,890
Derivative asset, fair value, gross amount not offset on Balance sheet 43,403 54,067
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 560,530 445,823
Derivative Liability, Fair Value, Gross Liability 599,990 465,066
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 2,504 1,591
Derivative liability, fair value, gross amount not offset on balance sheet 43,403 54,067
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 554,083 409,408
Foreign Exchange Contract [Member]
    
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Derivative Assets 2,523 7,079
Derivative asset, fair value, gross amount not offset on Balance sheet 1,174 957
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 1,349 6,122
Derivative Liability, Fair Value, Gross Liability 2,248 5,925
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 0
Derivative liability, fair value, gross amount not offset on balance sheet 1,174 957
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 1,074 4,968
Commodity and Freight Derivatives [Member]
    
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Derivative Assets 597,210 468,673
Derivative asset, fair value, gross amount not offset on Balance sheet 42,229 53,107
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 554,981 415,566
Derivative Liability, Fair Value, Gross Liability 597,612 458,893
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 2,504 1,591
Derivative liability, fair value, gross amount not offset on balance sheet 42,229 53,107
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 552,879 404,195
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 4,200 24,135
Derivative asset, fair value, gross amount not offset on Balance sheet 0 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 4,200 24,135
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 Assets   3
Derivative asset, fair value, gross amount not offset on Balance sheet   3
Derivative Asset, Fair Value, Amount Not Offset Against Collateral   0
Derivative Liability, Fair Value, Gross Liability 130 248
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 0
Derivative liability, fair value, gross amount not offset on balance sheet 0 3
Derivative Liability, Fair Value, Amount Not Offset Against Collateral $ 130 $ 245