XML 34 R56.htm IDEA: XBRL DOCUMENT v2.4.1.9
Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) (USD $)
 6 Months Ended
Feb. 28, 2015
Fair Value, Inputs, Level 3 [Member] | 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 $ 20.78chscp_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 6 months [3]
Fair Value, Inputs, Level 3 [Member] | 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 21.79chscp_FairValueInputsForwardCrackSpreadMarginQuotesAndManagementEstimatesBasedOnFutureSettlement
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= chscp_ContingentLiabilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 [1]
Own credit risk 0.94%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 6 months [3]
Fair Value, Inputs, Level 3 [Member] | 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 21.55chscp_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 6 months 25 days [3]
National Cooperative Refinery Association [Member]  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest $ 121,070,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= chscp_NationalCooperativeRefineryAssociationMember
National Cooperative Refinery Association [Member] | Fair Value, Inputs, Level 3 [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 165.25%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_BusinessAcquisitionAxis
= chscp_NationalCooperativeRefineryAssociationMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= chscp_ContingentLiabilityMember		 [5]
[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