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Investments - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2014 | Aug. 31, 2015 | May. 31, 2014
Horizon Milling, LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Ownership Percentage |  |  | 24.00%
Equity Method Investment, Realized Gain (Loss) on Disposal | $ 109.2 |  |
Ventura Foods, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |
Equity value exceeding carrying value |  | $ 12.9 |

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