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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) - May. 31, 2015 - National Cooperative Refinery Association [Member] - Fair Value, Measurement Frequency [Domain] - USD ($) | Total
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Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  | $ 109,220,000
Fair Value, Inputs, Level 3 [Member] | 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) | [1] | $ 17.50
Expected volatility | [2] | 157.34%
Fair Value, Inputs, Level 3 [Member] | Accrued liability for contingent crack spread payments related to purchase of noncontroling interests | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Forward crack spread margin | [3] | $ 20.70
Own credit risk | [4] | 0.09%
Expected life (years) | [5] | 3 months
Fair Value, Inputs, Level 3 [Member] | Accrued liability for contingent crack spread payments related to purchase of noncontroling interests | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Forward crack spread margin | [3] | $ 25.30
Own credit risk | [4] | 0.94%
Expected life (years) | [5] | 2 years 3 months
Fair Value, Inputs, Level 3 [Member] | 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 | [3] | $ 24.16
Own credit risk | [4] | 0.54%
Expected life (years) | [5] | 1 year 4 months 25 days
[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 Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + 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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