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Investments - Narrative (Details) (USD $) |  | 3 Months Ended |  |  |  | 3 Months Ended
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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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