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Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Aug. 31, 2014
Finite-Lived Intangible Assets, Net  
Number of Refineries 2
Minimum | Subsidiaries
  
Income Taxes [Abstract]  
Subsidiaries Ownership Percentage 80.00%
Minimum | Customer Lists, Trademarks and Agreements Not to Compete
  
Finite-Lived Intangible Assets, Net  
Finite-Lived Intangible Asset, Useful Life 2 years
Minimum | Major Maintenace Activities Requiring Shutdown
  
Finite-Lived Intangible Assets, Net  
Finite-Lived Intangible Asset, Useful Life 2 years
Minimum | Land Improvements [Member]
  
Derivative Instruments, Gain (Loss) [Line Items]  
Property, Plant and Equipment, Useful Life 15 years
Minimum | Building
  
Derivative Instruments, Gain (Loss) [Line Items]  
Property, Plant and Equipment, Useful Life 20 years
Minimum | Machinery, Equipment, Office and Other
  
Derivative Instruments, Gain (Loss) [Line Items]  
Property, Plant and Equipment, Useful Life 5 years
Minimum | Property, Plant and Equipment, Other Types [Member]
  
Derivative Instruments, Gain (Loss) [Line Items]  
Property, Plant and Equipment, Useful Life 3 years
Maximum | Customer Lists, Trademarks and Agreements Not to Compete
  
Finite-Lived Intangible Assets, Net  
Finite-Lived Intangible Asset, Useful Life 30 years
Maximum | Major Maintenace Activities Requiring Shutdown
  
Finite-Lived Intangible Assets, Net  
Finite-Lived Intangible Asset, Useful Life 4 years
Maximum | Land Improvements [Member]
  
Derivative Instruments, Gain (Loss) [Line Items]  
Property, Plant and Equipment, Useful Life 20 years
Maximum | Building
  
Derivative Instruments, Gain (Loss) [Line Items]  
Property, Plant and Equipment, Useful Life 40 years
Maximum | Machinery, Equipment, Office and Other
  
Derivative Instruments, Gain (Loss) [Line Items]  
Property, Plant and Equipment, Useful Life 20 years
Maximum | Property, Plant and Equipment, Other Types [Member]
  
Derivative Instruments, Gain (Loss) [Line Items]  
Property, Plant and Equipment, Useful Life 10 years
8% Preferred Stock [Member]
  
Equity  
Preferred stock, dividend rate, percentage 8.00%