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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) (Fair Value, Inputs, Level 3, USD $) | 12 Months Ended
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Aug. 31, 2012
Accrued liability for contingent crack spread payments related to purchase of noncontroling interests |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Contractual target crack spread margin (in dollars per share) | $ 17.50 | [1]
Expected volatility | 86.11% | [2]
Accrued liability for contingent crack spread payments related to purchase of noncontroling interests | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Forward crack spread margin on May 31 | $ 13.77 | [3]
Risk-free interest rate | 0.16% | [4]
Expected life (years) | 1 year 0 months | [5]
Accrued liability for contingent crack spread payments related to purchase of noncontroling interests | Average |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Forward crack spread margin on May 31 | 16.15 | [3]
Risk-free interest rate | 0.38% | [4]
Expected life (years) | 3 years 4 months 24 days | [5]
Accrued liability for contingent crack spread payments related to purchase of noncontroling interests | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Forward crack spread margin on May 31 | 21.62 | [3]
Risk-free interest rate | 0.59% | [4]
Expected life (years) | 5 years 0 months | [5]
Mandatorily redeemable noncontrolling interests | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Own credit risk | 2.16% | [6]
Mandatorily redeemable noncontrolling interests | Average |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Own credit risk | 2.40% | [6]
Mandatorily redeemable noncontrolling interests | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Own credit risk | 2.56% | [6]
Fair Value, Measurements, Recurring |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest | 127,516,000 |
Fair Value, Measurements, Recurring | Accrued liability for contingent crack spread payments related to purchase of noncontroling interests |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest | 127,516,000 |
Fair Value, Measurements, Nonrecurring | Mandatorily redeemable noncontrolling interests |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Mandatorily redeemable noncontrolling interests | $ 334,707,000 |
[1] | Represents the minimum contractual threshold that would require settlement with the counterparties
[2] | Represents quarterly adjusted volatility estimates derived from daily historical market data
[3] | Represents forward crack spread margin quotes and management estimates based on future settlement dates
[4] | Represents yield curves for U.S. Treasury securities
[5] | Represents the range in the number of years remaining related to each contingent payment
[6] | Represents the range of company-specific risk adjustments commensurate with typical long-term borrowing rates available to the Company at inception of the contract

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- Definition Contingent Liability, Fair Value DIsclosure + References No definition available. + Details
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- Definition Fair Value Inputs, Forward Crack Spread Margin Quotes and Management Estimates Based on Future Settlement + References No definition available. + Details
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- Definition Fair Value Inputs, Target Crack Spread Margin Minimum Contractual Settlement Threshold + References No definition available. + Details
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- Definition Mandatorily Redeemable Noncontrolling Interests, Fair Value Disclosure + References No definition available. + Details
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Risk-free interest rate assumption used in valuing an instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Details
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- Definition Risk associated with risk of default, credit spread risk and downgrade risk, expressed as a percentage, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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