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Other Assets - Narrative (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Goodwill [Line Items]      
Goodwill, acquired during period $ 72.9 $ 8.3  
Amortization of intangible assets 9.7 10.0 12.7
Ag Business
     
Goodwill [Line Items]      
Finite-lived intangible assets acquired 38.8 1.5  
Series of Individually Immaterial Business Acquisitions [Member]
     
Goodwill [Line Items]      
Payments to Acquire Assets, Investing Activities $ 281.5 $ 12.7