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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) - National Cooperative Refinery Association [Member] - Fair Value, Inputs, Level 3 [Member] - Accrued liability for contingent crack spread payments related to purchase of noncontroling interests | 9 Months Ended
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May 31, 2016 USD ($) $ / shares
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Contractual target crack spread margin (in dollars per share) | $ / shares | $ 17.50 | [1]
Expected volatility | 159.91% | [2]
Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Forward crack spread margin | $ 12.96 | [3]
Own credit risk | 0.48% | [4]
Expected life (years) | 3 months | [5]
Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Forward crack spread margin | $ 14.81 | [3]
Own credit risk | 0.94% | [4]
Expected life (years) | 1 year 3 months | [5]
Average |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Forward crack spread margin | $ 13.72 | [3]
Own credit risk | 0.67% | [4]
Expected life (years) | 7 months 28 days | [5]
[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

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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=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 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=36462937&loc=d3e19207-110258 + Details
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