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Summary of Significant Accounting Policies - Narrative (Details) (USD $) | 12 Months Ended
--- | ---
Aug. 31, 2013 | Aug. 31, 2012
Equity |  |
Preferred stock, dividend rate, percentage | 8.00% |
Derivative Instrument Detail |  |
Notional Amount of Interest Rate Cash Flow Hedge Derivatives | $ 300,000,000 |
Debt, Weighted Average Interest Rate | 5.00% |
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Assets at Fair Value | 7,100,000 |
Finite-Lived Intangible Assets, Net |  |
Number of Refineries | 2 |
Income Taxes [Abstract] |  |
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | 5,900,000 |
Interest Rate Contracts, Expiring At Various Times Through Fiscal 2018 |  |
Derivative Instrument Detail |  |
Notional Amount of Interest Rate Cash Flow Hedge Derivatives | 8,600,000 |
Interest Rate Contracts, Expiring During Fiscal 2013 |  |
Derivative Instrument Detail |  |
Notional Amount of Interest Rate Cash Flow Hedge Derivatives | 300,000 |
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] |  |
Property, Plant and Equipment |  |
Property, Plant and Equipment, Estimated Useful Lives | P15Y |
Minimum | Building |  |
Property, Plant and Equipment |  |
Property, Plant and Equipment, Estimated Useful Lives | 20 |
Minimum | Machinery, Equipment, Office and Other |  |
Property, Plant and Equipment |  |
Property, Plant and Equipment, Estimated Useful Lives | P5Y |
Minimum | Property, Plant and Equipment, Other Types [Member] |  |
Property, Plant and Equipment |  |
Property, Plant and Equipment, Estimated Useful Lives | 3 |
Maximum |  |
Derivative Instrument Detail |  |
Notes Payable Maturities | 30 days |
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] |  |
Property, Plant and Equipment |  |
Property, Plant and Equipment, Estimated Useful Lives | P20Y |
Maximum | Land Improvements and Buildings |  |
Property, Plant and Equipment |  |
Property, Plant and Equipment, Estimated Useful Lives | 40 |
Maximum | Machinery, Equipment, Office and Other |  |
Property, Plant and Equipment |  |
Property, Plant and Equipment, Estimated Useful Lives | P20Y |
Maximum | Property, Plant and Equipment, Other Types [Member] |  |
Property, Plant and Equipment |  |
Property, Plant and Equipment, Estimated Useful Lives | 10 |
Service Life |  |
Property, Plant and Equipment |  |
Property, Plant and Equipment, Estimated Useful Lives | P20Y | P16Y
Change in Accounting Estimate, Financial Effect |  | 27,000,000
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member] |  |
Derivative Instrument Detail |  |
Derivative Assets | 24,135,000 |
Immaterial Balance Sheet Revision [Member] | Derivative Financial Instruments, Assets [Member] |  |
Income Taxes [Abstract] |  |
Quantifying Misstatement in Current Year Financial Statements, Amount | 221,900,000 |
Immaterial Balance Sheet Revision [Member] | Derivative Financial Instruments, Liabilities [Member] |  |
Income Taxes [Abstract] |  |
Quantifying Misstatement in Current Year Financial Statements, Amount | 340,800,000 |
Immaterial Balance Sheet Revision [Member] | Accounts Payable [Member] |  |
Income Taxes [Abstract] |  |
Quantifying Misstatement in Current Year Financial Statements, Amount | $ 118,900,000 |

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