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Investments - Narrative (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Aug. 31, 2014
May 31, 2014
Horizon Milling, LLC [Member]
   
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage   24.00%
Equity Method Investment, Realized Gain (Loss) on Disposal $ 109.2  
Ventura Foods, LLC
   
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 50.00%  
Equity value exceeding carrying value $ 12.9