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Other Assets - Narrative (Details) (USD $)
12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Goodwill [Line Items]      
Amortization of intangible assets $ 12,700,000 $ 11,000,000 $ 11,400,000
Ag Business
     
Goodwill [Line Items]      
Goodwill, acquired during period 55,500,000 3,400,000  
Finite-lived intangible assets acquired $ 23,400,000 $ 1,900,000