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Fair Value Measurements - Fair Value Reconciliation Liabilities Using Significant Unobservable Inputs (3 month) (Level 3) (Details) (National Cooperative Refinery Association [Member], Crack Spread Contingent Payment [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |  |  |
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Feb. 28, 2015 | Feb. 28, 2014 | Feb. 28, 2015 | Feb. 28, 2014 | Nov. 30, 2014 | Aug. 31, 2014 | Nov. 30, 2013 | Aug. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Balance |  |  |  |  | $ 86,520 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | $ 114,917 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | $ 150,991 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | $ 134,134 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Balance | 121,070 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | 140,631 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | 121,070 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | 140,631 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | 86,520 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | 114,917 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | 150,991 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue | 134,134 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Cost of Goods, Total |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Total gains or losses included in cost of goods sold and net interest | $ 34,550 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_BusinessAcquisitionAxis = chscp_NationalCooperativeRefineryAssociationMember / us-gaap_ContingentConsiderationByTypeAxis = chscp_CrackSpreadContingentPaymentMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfGoodsTotalMember | $ (10,360)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_BusinessAcquisitionAxis = chscp_NationalCooperativeRefineryAssociationMember / us-gaap_ContingentConsiderationByTypeAxis = chscp_CrackSpreadContingentPaymentMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfGoodsTotalMember | $ 6,153 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_BusinessAcquisitionAxis = chscp_NationalCooperativeRefineryAssociationMember / us-gaap_ContingentConsiderationByTypeAxis = chscp_CrackSpreadContingentPaymentMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfGoodsTotalMember | $ 6,497 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_BusinessAcquisitionAxis = chscp_NationalCooperativeRefineryAssociationMember / us-gaap_ContingentConsiderationByTypeAxis = chscp_CrackSpreadContingentPaymentMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfGoodsTotalMember |  |  |  |

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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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