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Investments - Narrative (Details) (USD $) In Millions, unless otherwise specified |  |  | 6 Months Ended
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Feb. 28, 2013 | Feb. 28, 2013 Horizon Milling, LLC [Member] | Feb. 28, 2013 Ventura Foods, LLC | Feb. 28, 2013 National Cooperative Refinery Association [Member] | Aug. 31, 2012 National Cooperative Refinery Association [Member] | Feb. 28, 2013 Growmark [Member] National Cooperative Refinery Association [Member] | Feb. 28, 2013 MFA [Member] National Cooperative Refinery Association [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  |  |  |  | 74.50% |  |
Business Combination, Step Acquisition, Amount |  |  |  |  |  | $ 48.0 | $ 18.0
Business Combination, Step Acquisition, First Closing, Equity Interest in Acquiree, Percentage |  |  |  | 79.20% |  |  |
Ownership percentage |  | 24.00% | 50.00% |  |  |  |
Expected ownership of future joint venture | 0.00% |  |  |  |  |  |
Equity value exceeding carrying value |  |  | $ 12.9 |  |  |  |

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