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Acquisitions (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Feb. 28, 2014 | Feb. 28, 2013 | Aug. 31, 2013
Business Acquisition [Line Items] |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 97,858 | $ 8,074 |
Goodwill | 104,615 | 88,147 | 85,100
Energy [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | 1,165 | 1,165 |
Energy [Member] | National Cooperative Refinery Association [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest | 140,631 |  |
Ag Business [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | $ 96,552 | $ 80,084 |

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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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