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Investments - Narrative (Details) (USD $)				3 Months Ended					3 Months Ended
	Nov. 30, 2013	Nov. 30, 2013 Horizon Milling, LLC [Member]	Nov. 30, 2013 Ventura Foods, LLC	Nov. 30, 2013 National Cooperative Refinery Association [Member]	Nov. 30, 2012 National Cooperative Refinery Association [Member]	Aug. 31, 2013 National Cooperative Refinery Association [Member]	Nov. 30, 2013 Contingent Liability [Member] National Cooperative Refinery Association [Member]	Oct. 31, 2013 Crack Spread Contingent Payment [Member]	Nov. 30, 2013 Minimum [Member] Spiritwood fertilizer plant [Member]	Nov. 30, 2013 Maximum [Member] Spiritwood fertilizer plant [Member]
Schedule of Equity Method Investments [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage				84.00%		79.20%
Business Acquisition, Cost of Acquired Entity, Cash Paid								$ 16,500,000
Business Combination, Step Acquisition, Amount				66,000,000	66,000,000
Business Acquisition, Contingent Consideration, at Fair Value							151,000,000
Ownership percentage		24.00%	50.00%
Equity value exceeding carrying value			12,900,000
Expected ownership of future joint venture	12.00%
Expected borrowings of future joint venture	600,000,000
Expected future investment									1,000,000,000
Research and Development Expense										$ 25,000,000

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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