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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
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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 | $ 11.23 chscp_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 | 16.03 chscp_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 | 14.84 chscp_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) | $ 17.50 chscp_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 | $ 86,520,000 us-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

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- Definition Fair Value Inputs, Forward Crack Spread Margin Quotes and Management Estimates Based on Future Settlement + References No definition available. + Details
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- Definition Fair Value Inputs, Target Crack Spread Margin Minimum Contractual Settlement Threshold + References No definition available. + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 + Details
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + 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 (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Risk-free interest rate assumption used in valuing an instrument. + 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 (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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