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Commitments and Contingencies - Narrative (Details) (USD $) | 12 Months Ended
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Aug. 31, 2014 | Aug. 31, 2013 | Aug. 31, 2012
Property, Plant and Equipment [Line Items] |  |  |
Loss Contingency, Loss in Period | $ 18,000,000 |  |
Loss Contingency Accrual, Payments | 11,500,000 |  |
Insurance Recoveries | 0 |  |
Guarantees [Abstract] |  |  |
Guarantor obligations, maximum exposure, undiscounted | 1,000,000,000 |  |
Guarantor obligations, current carrying value | 105,200,000 |  |
Lease Commitments |  |  |
Number of rail cars under operating lease commitments | 3,000 |  |
Operating leases, rent expense, net | 91,800,000 | 81,500,000 | 74,600,000
CHS Capital [Member] |  |  |
Credit Commitments [Abstract] |  |  |
CHS Capital long-term notes receivable additional available credit of counterparty | $ 1,100,000,000 |  |
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 Notes and Loans Receivables, Net, Noncurrent, Remaining Borrowing Capacity of Counterparty + References No definition available. + Details
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- Definition Operating Leases, Number of Railroad Transportation Equipment Leased + References No definition available. + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + 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 (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + 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 The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of payments made reducing loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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