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Summary of Significant Accounting Policies - Pretax Gains (Losses) On Derivatives Not Accounted For As Hedging Instruments (Details) (Not Designated as Hedging Instrument, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]    
Pretax gain (loss) on derivative instruments $ (329,978) $ (50,247)
Commodity and freight derivatives | Cost of goods sold
   
Derivative Instruments, Gain (Loss) [Line Items]    
Pretax gain (loss) on derivative instruments (328,284) (50,933)
Foreign exchange derivatives | Cost of goods sold
   
Derivative Instruments, Gain (Loss) [Line Items]    
Pretax gain (loss) on derivative instruments (1,685) 686
Interest rate derivatives | Interest, net
   
Derivative Instruments, Gain (Loss) [Line Items]    
Pretax gain (loss) on derivative instruments $ (9)