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Summary of Significant Accounting Policies - Narrative (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended
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Aug. 31, 2012 Refineries | Aug. 31, 2010 | Aug. 31, 2012 Interest Rate Contracts, Expiring At Various Times Through Fiscal 2018 | Aug. 31, 2012 Interest Rate Contracts, Expiring During Fiscal 2013 | Aug. 31, 2012 Minimum Subsidiaries | Aug. 31, 2012 Minimum Customer Lists, Trademarks and Agreements Not to Compete | Aug. 31, 2012 Minimum Major Maintenace Activities Requiring Shutdown | Aug. 31, 2012 Minimum Land Improvements and Buildings | Aug. 31, 2012 Minimum Machinery, Equipment, Office and Other | Aug. 31, 2012 Maximum | Aug. 31, 2012 Maximum Customer Lists, Trademarks and Agreements Not to Compete | Aug. 31, 2012 Maximum Major Maintenace Activities Requiring Shutdown | Aug. 31, 2012 Maximum Land Improvements and Buildings | Aug. 31, 2012 Maximum Machinery, Equipment, Office and Other | Aug. 31, 2012 Service Life | Aug. 31, 2011 Service Life
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 8.00% | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding | 12,272,003 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instrument Detail |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flow Hedge Loss Reclassified to Cost of Sales | $ 3.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable Maturities |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred | 6.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount of Interest Rate Cash Flow Hedge Derivatives |  |  | 12.5 | 0.3 |  |  |  |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate | 5.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Assets at Fair Value | 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives |  |  |  |  |  |  |  | P15Y | P3Y |  |  |  | P40Y | P20Y | P20Y | P16Y
Change in Accounting Estimate, Financial Effect |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27.0 |
Finite-Lived Intangible Assets, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  | 3 years | 2 years |  |  |  | 30 years | 4 years |  |  |  |
Number of Refineries | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries Ownership Percentage |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | $ 2.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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