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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) - NCRA [Member] - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Nov. 30, 2016 | Aug. 31, 2016 | Nov. 30, 2015 | Aug. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Crack spread contingent consideration liability | $ 8,281,000 |  |  |
Crack Spread Contingent Payment [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 8,281,000 | $ 15,051,000 | $ 46,693,000 | $ 78,982,000
Crack Spread Contingent Payment [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |
Forward crack spread margin | $ 9.32 |  |  |
Contractual target crack spread margin (in dollars per share) | $ 17.50 |  |  |
Expected volatility | 143.31% |  |  |
Own credit risk | 0.94% |  |  |
Expected life (years) | 9 months |  |  |

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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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