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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) - NCRA [Member] - USD ($) | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |
Crack spread contingent consideration liability | $ 2,172,000 |  |  |  |  |
Crack Spread Contingent Payment [Member] |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 2,172,000 | $ 8,281,000 | $ 15,051,000 | $ 24,155,000 | $ 43,693,000 | $ 75,982,000
Crack Spread Contingent Payment [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |
Forward crack spread margin | $ 11.86 |  |  |  |  |
Contractual target crack spread margin (in dollars per share) | $ 17.50 |  |  |  |  |
Expected volatility | 87.68% |  |  |  |  |
Own credit risk | 0.94% |  |  |  |  |
Expected life (years) | 6 months |  |  |  |  |

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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 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 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: 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 3: 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 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 (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&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 (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&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 (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&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=66048111&loc=d3e19207-110258 + Details
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