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Investments - Schedule of Investments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Aug. 31, 2014	May 31, 2014
Schedule of Equity Method Investments [Line Items]
Joint venture contract, term	25 years
Ventura Foods, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%
Equity Method Investments	$ 321.3
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	198.4
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%
Equity Method Investments	$ 68.4
Cargill, Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Ownership of joint venture partner	50.00%

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- Definition

Equity Method Investment, Additional Cash Contribution

+ References

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- Definition

Joint venture contract, term

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Ownership of joint venture partner

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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- Definition

Amount of gain (loss) on sale or disposal of an equity method investment.

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

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Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities.

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