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Derivatives Derivative Assets and Liabilities Not Designated as Hedging Instruments (Details) (USD $)
 12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Not Designated as Hedging Instrument [Member] | Commodity and Freight Derivatives [Member] | Cost of Sales [Member]
      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 210,164,000 $ (482,352,000) $ 311,167,000
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Cost of Sales [Member]
      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (5,595,000) (452,000) (5,219,000)
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Interest Expense [Member]
      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 114,000 300,000 206,000
Designated as Hedging Instrument [Member]
      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 204,683,000 (482,504,000) 306,154,000
Interest Rate Contracts, Expiring During Fiscal 2015
      
Derivative [Line Items]      
Derivative, Notional Amount 400,000    
Interest Rate Contracts, Expiring At Various Times Through Fiscal 2018 [Member]
      
Derivative [Line Items]      
Derivative, Notional Amount $ 5,000,000