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Fair Value Measurements - Fair Value Reconciliation Liabilities Using Significant Unobservable Inputs (3 month) (Level 3) (Details) (National Cooperative Refinery Association [Member], Crack Spread Contingent Payment [Member], USD $) In Thousands, unless otherwise specified |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2014 | Nov. 30, 2013 | Aug. 31, 2013 | Feb. 28, 2013 | Aug. 31, 2012 | Nov. 30, 2011 | Feb. 28, 2014 Cost of Goods, Total | Feb. 28, 2013 Cost of Goods, Total | Feb. 28, 2014 Cost of Goods, Total | Feb. 28, 2013 Cost of Goods, Total
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance | $ 140,631 | $ 150,991 | $ 134,134 | $ 140,987 | $ 127,516 | $ 170,621 |  |  |  |
Total gains or losses included in cost of goods sold and net interest |  |  |  |  |  |  | (10,360) | (29,634) | 6,497 | 13,471
Balance | $ 140,631 | $ 150,991 | $ 134,134 | $ 140,987 | $ 127,516 | $ 170,621 |  |  |  |

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- Definition Amount of gain (loss) recognized on the income statement for 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)(1) -URI http://asc.fasb.org/extlink&oid=25499696&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=25499696&loc=d3e19207-110258 + Details
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