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Investments - Narrative (Details) (USD $)			12 Months Ended
	Aug. 31, 2011 Grain_Export_Facilities	Aug. 31, 2012 Ventura Foods, LLC	Aug. 31, 2011 Multigrain AG	Aug. 31, 2010 Multigrain AG	Aug. 31, 2012 Agrillance LLC	Aug. 31, 2011 Agrillance LLC Sale of the Agriliance Retail Facilities	Aug. 31, 2010 Agrillance LLC Sale of the Agriliance Retail Facilities	Aug. 31, 2012 Agrillance LLC Transfer of Pension Plan Assets And Liabilities	Aug. 31, 2012 Agrillance LLC Land O' Lakes	Aug. 31, 2012 TEMCO, LLC	Aug. 31, 2012 TEMCO, LLC Cargill, Inc.
Schedule of Equity Method Investments [Line Items]
Defined benefit plan, transfer of liabilities in					$ 84,500,000
Ownership percentage		50.00%	45.00%		50.00%				50.00%	50.00%	50.00%
Equity value exceeding carrying value		12,900,000
Payments to acquire interest in joint venture				24,000,000
Joint venture, net sales proceeds			225,000,000
Joint venture, realized gain (loss) on disposal			119,700,000			9,000,000	28,400,000	(800,000)
Payments to acquire equity method investments					45,400,000
Proceeds from joint venture, dividends or distributions, return of capital						28,000,000	105,000,000	12,700,000
Long-term supply commitment, term										25 years
Number of grain export facilities	2
Defined benefit plan, transfer of assets in					$ 97,200,000

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Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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