Fair Value Inputs, Forward Crack Spread Margin Quotes and Management Estimates Based on Future Settlement

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- Definition

Fair Value Inputs, Target Crack Spread Margin Minimum Contractual Settlement Threshold

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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
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-Publisher FASB
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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Risk-free interest rate assumption used in valuing an instrument.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 820
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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) - NCRA [Member] - USD ($)	9 Months Ended
	May 31, 2017	Feb. 28, 2017	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Aug. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Crack spread contingent consideration liability	$ 1,778,000
Crack Spread Contingent Payment [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	1,778,000	$ 2,172,000	$ 15,051,000	$ 24,661,000	$ 24,155,000	$ 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	$ 14.56
Contractual target crack spread margin (in dollars per share)	$ 17.50
Expected volatility	78.71%
Own credit risk	0.94%
Expected life (years)	3 months