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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: 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

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-Subparagraph a (1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Investments - Narrative (Details) (USD $) In Millions, unless otherwise specified				3 Months Ended
	Nov. 30, 2012 Ventura Foods, LLC	Nov. 30, 2012 National Cooperative Refinery Association [Member]	Aug. 31, 2012 National Cooperative Refinery Association [Member]	Nov. 30, 2012 Growmark [Member] National Cooperative Refinery Association [Member]	Nov. 30, 2012 MFA [Member] National Cooperative Refinery Association [Member]
Schedule of Equity Method Investments [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage			74.50%
Business Combination, Step Acquisition, Amount				$ 48.0	$ 18.0
Business Combination, Step Acquisition, First Closing, Equity Interest in Acquiree, Percentage		79.20%
Ownership percentage	50.00%
Equity value exceeding carrying value	$ 12.9