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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2015 | Aug. 31, 2014 | Aug. 31, 2013
Fair Value, Inputs, Level 3 | Accrued liability for contingent crack spread payments related to purchase of noncontroling interests | Minimum |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Forward Crack Spread Margin Quotes and Management Estimates Based on Future Settlement | [1] | $ 12.99 |  |
Risk-free interest rate | [2] | 0.48% |  |
Expected life (years) | [3] | 1 year |  |
Fair Value, Inputs, Level 3 | Accrued liability for contingent crack spread payments related to purchase of noncontroling interests | Average |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Forward Crack Spread Margin Quotes and Management Estimates Based on Future Settlement | [1] | $ 19.67 |  |
Risk-free interest rate | [2] | 0.67% |  |
Expected life (years) | [3] | 1 year 5 months 7 days |  |
Fair Value, Inputs, Level 3 | Accrued liability for contingent crack spread payments related to purchase of noncontroling interests | Maximum |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Fair Value Inputs, Forward Crack Spread Margin Quotes and Management Estimates Based on Future Settlement | [1] | $ 24.33 |  |
Risk-free interest rate | [2] | 0.94% |  |
Expected life (years) | [3] | 2 years |  |
Crack Spread Contingent Payment [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  | $ 75,982,000 | $ 114,917,000 | $ 134,134,000
Crack Spread Contingent Payment [Member] | NCRA [Member] | Fair Value, Inputs, Level 3 |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  | $ 75,982,000 |  |
Contractual target crack spread margin (in dollars per share) | [4] | $ 17.50 |  |
Expected volatility | [5] | 159.05% |  |
[1] | Represents forward crack spread margin quotes and management estimates based on future settlement dates
[2] | Represents yield curves for U.S. Treasury securities
[3] | Represents the range in the number of years remaining related to each contingent payment
[4] | Represents the minimum contractual threshold that would require settlement with the counterparties
[5] | Represents quarterly adjusted volatility estimates derived from daily historical market data

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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=36462937&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=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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