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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) (Fair Value, Inputs, Level 3 [Member], USD $)
 3 Months Ended
Nov. 30, 2014
Accrued liability for contingent crack spread payments related to purchase of noncontroling interests | Minimum [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Forward crack spread margin $ 11.23chscp_FairValueInputsForwardCrackSpreadMarginQuotesAndManagementEstimatesBasedOnFutureSettlement
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= chscp_ContingentLiabilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 [1]
Own credit risk 0.09%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= chscp_ContingentLiabilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 [2]
Expected life (years) 0 years 9 months [3]
Accrued liability for contingent crack spread payments related to purchase of noncontroling interests | Maximum [Member]
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Forward crack spread margin 16.03chscp_FairValueInputsForwardCrackSpreadMarginQuotesAndManagementEstimatesBasedOnFutureSettlement
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= chscp_ContingentLiabilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 [1]
Own credit risk 0.90%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= chscp_ContingentLiabilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 [2]
Expected life (years) 2 years 9 months [3]
Accrued liability for contingent crack spread payments related to purchase of noncontroling interests | Average
  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Forward crack spread margin 14.84chscp_FairValueInputsForwardCrackSpreadMarginQuotesAndManagementEstimatesBasedOnFutureSettlement
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= chscp_ContingentLiabilityMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 [1]
Own credit risk 0.53%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= chscp_ContingentLiabilityMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 [2]
Expected life (years) 1 year 10 months 25 days [3]
National Cooperative Refinery Association [Member] | Accrued liability for contingent crack spread payments related to purchase of noncontroling interests  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Contractual target crack spread margin (in dollars per share) $ 17.50chscp_FairValueInputsMinimumContractualSettlementThreshold
/ us-gaap_BusinessAcquisitionAxis
= chscp_NationalCooperativeRefineryAssociationMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= chscp_ContingentLiabilityMember		 [4]
Expected volatility 140.18%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_BusinessAcquisitionAxis
= chscp_NationalCooperativeRefineryAssociationMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= chscp_ContingentLiabilityMember		 [5]
National Cooperative Refinery Association [Member] | Fair Value, Measurements, Recurring [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest $ 86,520,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= chscp_NationalCooperativeRefineryAssociationMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
[1] Represents forward crack spread margin quotes and management estimates based on future settlement dates
[2] Represents yield curves for U.S. Treasury securities
[3] Represents the range in the number of years remaining related to each contingent payment
[4] Represents the minimum contractual threshold that would require settlement with the counterparties
[5] Represents quarterly adjusted volatility estimates derived from daily historical market data