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Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) (USD $)
 6 Months Ended
Feb. 28, 2014
Refineries
Feb. 28, 2013
Aug. 31, 2013
Finite-Lived Intangible Assets [Line Items]      
Goodwill $ 104,615,000 $ 88,147,000 $ 85,100,000
Goodwill, Acquired During Period 19,400,000    
Payments to Acquire Businesses, Net of Cash Acquired 97,858,000 8,074,000  
Finite-Lived Intangible Assets, Gross 113,500,000 81,800,000 81,500,000
Finite-Lived Intangible Assets, Accumulated Amortization 46,700,000 40,500,000 46,000,000
Finite-lived Intangible Assets Acquired 36,200,000 1,400,000  
Amortization of Intangible Assets 4,900,000 5,000,000  
Finite-Lived Intangible Assets, Amortization Expense, Next Rolling Twelve Months 8,141,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 8,654,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 7,902,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 6,334,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 3,543,000    
Thereafter 31,407,000    
Finite-Lived Intangible Assets, Net 65,981,000    
Number of Refineries 2    
Minimum [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 2 years    
Minimum [Member] | Major Maintenance Activities Requiring Shutdown [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 2 years    
Maximum [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 30 years    
Maximum [Member] | Major Maintenance Activities Requiring Shutdown [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 4 years    
Ag Business [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Goodwill 96,552,000 80,084,000  
Ag Business [Member] | Series of Individually Immaterial Business Acquisitions [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Payments to Acquire Businesses, Gross $ 97,900,000