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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015
Property, Plant and Equipment [Line Items] |  |  |
Maximum Guarantees Allowed by Bank Covenants | $ 1,000.0 |  |
Guarantees [Abstract] |  |  |
Guarantor obligations, maximum exposure, undiscounted | 105.3 |  |
Lease Commitments |  |  |
Operating leases, rent expense, net | 72.1 | $ 74.7 | $ 56.7
CHS Capital [Member] |  |  |
Credit Commitments [Abstract] |  |  |
CHS Capital long-term notes receivable additional available credit of counterparty | $ 966.6 |  |
Minimum |  |  |
Lease Commitments |  |  |
Lessee, Operating Lease, Term of Contract | 1 year |  |
Maximum |  |  |
Lease Commitments |  |  |
Lessee, Operating Lease, Term of Contract | 15 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=82913245&loc=d3e12069-110248 + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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