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Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended
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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%

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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