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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016
Guarantees [Abstract] |  |  |
Maximum guarantees allowed by bank covenants | $ 1,000.0 |  |
Guarantor obligations, maximum exposure, undiscounted | 122.3 |  |
Lease Commitments |  |  |
Operating leases, rent expense, net | 88.5 | $ 81.3 | $ 74.7
Sale-leaseback transaction, lease arrangement term |  | 20 years |
Sale leaseback transaction, annual rent | $ 3.4 |  |
Sale leaseback transaction, annual rent increase | 2.00% |  |
CHS Capital |  |  |
Credit Commitments [Abstract] |  |  |
CHS Capital long-term notes receivable additional available credit of counterparty | $ 706.3 |  |
Minimum |  |  |
Lease Commitments |  |  |
Operating leases, terms of contract | 1 year |  |
Maximum |  |  |
Lease Commitments |  |  |
Operating leases, terms of contract | 19 years |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248 + Details
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