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Other Assets - Narrative (Details) (USD $)
12 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Goodwill [Line Items]      
Amortization of intangible assets $ 10,000,000 $ 12,700,000 $ 11,000,000
Ag Business
     
Goodwill [Line Items]      
Goodwill, acquired during period 8,300,000 55,500,000  
Finite-lived intangible assets acquired $ 1,500,000 $ 23,400,000