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Derivatives Derivative Assets and Liabilities Not Designated as Hedging Instruments (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 155,972 $ 123,180 $ (59,518)
Commodity and Freight Derivatives [Member] | Cost of Sales [Member]      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 143,314 128,992 (97,373)
Foreign Exchange Contract [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 1,300,000 784,400  
Foreign Exchange Contract [Member] | Cost of Sales [Member]      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 12,551 (5,926) 37,555
Interest Rate Contract [Member] | Interest Expense [Member]      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 107 $ 114 $ 300
Interest Rate Contracts, Expiring During Fiscal 2016      
Derivative [Line Items]      
Derivative, Notional Amount 400    
Interest Rate Contracts, Expiring At Various Times Through Fiscal 2018 [Member]      
Derivative [Line Items]      
Derivative, Notional Amount $ 2,500