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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) (Fair Value, Inputs, Level 3 [Member], USD $) | 9 Months Ended |  |  |
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May 31, 2014 Accrued liability for contingent crack spread payments related to purchase of noncontroling interests Minimum [Member] | May 31, 2014 Accrued liability for contingent crack spread payments related to purchase of noncontroling interests Maximum [Member] | May 31, 2014 Accrued liability for contingent crack spread payments related to purchase of noncontroling interests Average | May 31, 2014 National Cooperative Refinery Association [Member] Accrued liability for contingent crack spread payments related to purchase of noncontroling interests | May 31, 2014 National Cooperative Refinery Association [Member] Fair Value, Measurements, Recurring [Member] | Aug. 31, 2013 National Cooperative Refinery Association [Member] Fair Value, Measurements, Recurring [Member] | May 31, 2013 National Cooperative Refinery Association [Member] Fair Value, Measurements, Recurring [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  |  |  |  |  |  |  |  | $ 130,159,000 | $ 134,134,000 | $ 146,245,000
Forward crack spread margin | $ 14.34 | [1] | $ 17.72 | [1] | $ 16.55 | [1] |  |  |  |  |
Contractual target crack spread margin (in dollars per share) |  |  |  |  |  |  | $ 17.50 | [2] |  |  |
Expected volatility |  |  |  |  |  |  | 128.59% | [3] |  |  |
Own credit risk | 1.80% | [4] | 2.60% | [4] | 2.23% | [4] |  |  |  |  |
Expected life (years) | 0 years 3 months | [5] | 3 years 3 months | [5] | 1 year 10 months 25 days | [5] |  |  |  |  |
[1] | Represents forward crack spread margin quotes and management estimates based on future settlement dates
[2] | Represents the minimum contractual threshold that would require settlement with the counterparties
[3] | Represents quarterly adjusted volatility estimates derived from daily historical market data
[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 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 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=25499696&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=25499696&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=25499696&loc=d3e19207-110258 + Details
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