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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
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         $ 86,520us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue $ 114,917us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue $ 150,991us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue $ 134,134us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Balance 121,070us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue 140,631us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue 121,070us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue 140,631us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue 86,520us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue 114,917us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue 150,991us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue 134,134us-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 $ 34,550us-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
$ 6,153us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_BusinessAcquisitionAxis
= chscp_NationalCooperativeRefineryAssociationMember
/ us-gaap_ContingentConsiderationByTypeAxis
= chscp_CrackSpreadContingentPaymentMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfGoodsTotalMember
$ 6,497us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_BusinessAcquisitionAxis
= chscp_NationalCooperativeRefineryAssociationMember
/ us-gaap_ContingentConsiderationByTypeAxis
= chscp_CrackSpreadContingentPaymentMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfGoodsTotalMember