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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

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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

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