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Other Assets - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Goodwill [Line Items]      
Goodwill, Acquired During Period $ 423 $ 72,913  
Amortization of intangible assets 7,300 9,700 $ 10,000
Ag [Member]      
Goodwill [Line Items]      
Goodwill, Acquired During Period   72,913  
Finite-lived intangible assets acquired 800 38,800  
Series of Individually Immaterial Business Acquisitions [Member]      
Goodwill [Line Items]      
Payments to Acquire Assets, Investing Activities $ 321,000    
Minimum | Other Intangible Assets [Member]      
Goodwill [Line Items]      
Finite-Lived Intangible Asset, Useful Life 2 years    
Minimum | Major Maintenance Activities Requiring Shutdown      
Goodwill [Line Items]      
Finite-Lived Intangible Asset, Useful Life 2 years    
Maximum | Other Intangible Assets [Member]      
Goodwill [Line Items]      
Finite-Lived Intangible Asset, Useful Life 30 years    
Maximum | Major Maintenance Activities Requiring Shutdown      
Goodwill [Line Items]      
Finite-Lived Intangible Asset, Useful Life 4 years    
Cash Distribution [Member] | Series of Individually Immaterial Business Acquisitions [Member]      
Goodwill [Line Items]      
Payments to Acquire Assets, Investing Activities $ 305,200 $ 281,500