XML 37 R34.htm IDEA: XBRL DOCUMENT v2.4.0.8
Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) (USD $)
 9 Months Ended
May 31, 2013
Refineries
May 31, 2012
Aug. 31, 2012
Finite-Lived Intangible Assets [Line Items]      
Goodwill $ 84,166,000 $ 66,821,000 $ 81,700,000
Finite-Lived Intangible Assets, Gross 82,100,000 99,500,000 100,600,000
Finite-Lived Intangible Assets, Accumulated Amortization 42,200,000 51,600,000 55,700,000
Finite-lived Intangible Assets Acquired 2,400,000 24,100,000  
Amortization of Intangible Assets 7,400,000 9,200,000  
Finite-Lived Intangible Assets, Amortization Expense, Next Rolling Twelve Months 10,009,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 6,633,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 5,964,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 5,041,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 3,193,000    
Thereafter 9,018,000    
Finite-Lived Intangible Assets, Net 39,858,000    
Number of Refineries 2    
Capitalized Maintenance Expense, Amortization 53,800,000 20,900,000  
Minimum [Member] | Other Intangible Assets [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] | Other Intangible Assets [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
      
Finite-Lived Intangible Assets [Line Items]      
Goodwill 76,103,000 58,758,000  
Goodwill, Acquired During Period   $ 40,800,000