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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Aug. 31, 2015 | Aug. 31, 2014 | Aug. 31, 2013
Property, Plant and Equipment [Line Items] |  |  |
Maximum Guarantees Allowed by Bank Covenants | $ 1,000.0 |  |
Guarantees [Abstract] |  |  |
Guarantor obligations, maximum exposure, undiscounted | 94.6 |  |
Lease Commitments |  |  |
Operating leases, rent expense, net | 56.7 | $ 47.4 | $ 41.6
CHS Capital [Member] |  |  |
Credit Commitments [Abstract] |  |  |
CHS Capital long-term notes receivable additional available credit of counterparty | $ 1,000.0 |  |
Minimum |  |  |
Lease Commitments |  |  |
Lessee Leasing Arrangements, Operating Leases, Term of Contract | 1 year |  |
Maximum |  |  |
Lease Commitments |  |  |
Lessee Leasing Arrangements, Operating Leases, Term of Contract | 12 years |  |

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- Definition Credit Commitments [Abstract] + References No definition available. + Details
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- Definition Maximum Guarantees Allowed by Bank Covenants + References No definition available. + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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