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Investments - Schedule of Investments (Details) - USD ($) $ in Millions | 12 Months Ended |
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Aug. 31, 2015 | Aug. 31, 2014 | May. 31, 2014
Ventura Foods, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |
Equity Method Investments | $ 347.7 |  |
Ardent Mills LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 12.00% |  |
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital |  | $ 121.2 |
Equity Method Investments | $ 196.8 |  |
Horizon Milling, LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Ownership Percentage |  |  | 24.00%
Equity Method Investment, Additional Cash Contribution |  | 32.8 |
Equity Method Investment, Realized Gain (Loss) on Disposal |  | $ 109.2 |
TEMCO, LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |
Joint venture contract, term | 25 years |  |
Equity Method Investments | $ 57.7 |  |
Cargill, Inc. [Member] | TEMCO, LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership of joint venture partner | 50.00% |  |

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