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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) (Fair Value, Inputs, Level 3, USD $) | 6 Months Ended |  |  |  |
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Feb. 28, 2013 Accrued liability for contingent crack spread payments related to purchase of noncontroling interests | Feb. 28, 2013 Accrued liability for contingent crack spread payments related to purchase of noncontroling interests Minimum | Feb. 28, 2013 Accrued liability for contingent crack spread payments related to purchase of noncontroling interests Maximum | Feb. 28, 2013 Accrued liability for contingent crack spread payments related to purchase of noncontroling interests Average | Feb. 28, 2013 Fair Value, Measurements, Recurring | Aug. 31, 2012 Fair Value, Measurements, Recurring | Feb. 29, 2012 Fair Value, Measurements, Recurring | Feb. 28, 2013 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 |  |  |  |  |  |  |  |  | $ 140,987,000 | $ 127,516,000 | $ 101,003,000 | $ 140,987,000
Forward crack spread margin |  |  | $ 24.74 | [1] | $ 39.23 | [1] | $ 30.24 | [1] |  |  |  |
Contractual target crack spread margin (in dollars per share) | $ 17.50 | [2] |  |  |  |  |  |  |  |  |  |
Expected volatility | 71.36% | [3] |  |  |  |  |  |  |  |  |  |
Own credit risk |  |  | 1.80% | [4] | 2.80% | [4] | 2.42% | [4] |  |  |  |
Expected life (years) |  |  | 0 years 6 months | [5] | 4 years 6 months | [5] | 2 years 10 months 24 days | [5] |  |  |  |
[1] | Represents adjusted forward crack spread margin quotes and management estimates based on future settlement dates
[2] | Represents the minimum contractual threshold that would require settlement with the counterparties
[3] | Represents quarterly adjusted volatility estimates derived from daily historical market data
[4] | Represents the range of company-specific risk adjustments commensurate with typical long-term borrowing rates available to us at measurement date
[5] | Represents the range in the number of years remaining related to each contingent payment

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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 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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