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Investments - Narrative (Details) (USD $) | 12 Months Ended |
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Aug. 31, 2013 | Aug. 31, 2012 | Aug. 31, 2011 | May 31, 2013
Schedule of Equity Method Investments [Line Items] |  |  |  |
Expected ownership of future joint venture |  |  |  | 12.00%
Expected borrowings of future joint venture |  |  |  | $ 600,000,000
Proceeds from Equity Method Investment, Dividends or Distributions | 62,761,000 | 75,468,000 | 137,766,000 |
Joint venture, realized gain (loss) on disposal |  | 800,000 | 9,000,000 |
Ventura Foods, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 50.00% |  |  |
Equity value exceeding carrying value | 12,900,000 |  |  |
Multigrain AG |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage |  |  | 45.00% |
Joint venture, net sales proceeds |  |  | 225,000,000 |
Joint venture, realized gain (loss) on disposal |  |  | 119,700,000 |
Agrillance LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Defined benefit plan, transfer of liabilities in | 84,500,000 | 84,500,000 |  |
Ownership percentage | 50.00% |  |  |
Payments to acquire equity method investments | 45,400,000 |  |  |
Defined benefit plan, transfer of assets in | 97,200,000 | 97,200,000 |  |
Agrillance LLC | Transfer of Pension Plan Assets And Liabilities |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Proceeds from joint venture, dividends or distributions, return of capital | 12,700,000 | 12,700,000 |  |
Agrillance LLC | Land O' Lakes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 50.00% |  |  |
Agriliance [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Proceeds from Equity Method Investment, Dividends or Distributions |  |  | $ 28,000,000 |
TEMCO, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 50.00% |  |  |
Long-term supply commitment, term | 25 years |  |  |
TEMCO, LLC | Cargill, Inc. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 50.00% |  |  |

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