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Investments - Narrative (Details) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2015 | Feb. 28, 2014 | Aug. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |  |
Payments for Repurchase of Redeemable Noncontrolling Interest | $ (65,981,000)us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest | $ (65,981,000)us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest |
Time Deposits | 315,000,000 us-gaap_TimeDeposits |  |
Ardent Mills [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments redeemed |  |  | 121,200,000 us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chscp_ArdentMillsMember
Horizon Milling, LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Additional Cash Contribution |  |  | 32,800,000 chscp_EquityMethodInvestmentAdditionalCashContribution / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chscp_HorizonMillingLlcMember
Gain (Loss) on Sale of Investments |  |  | 109,200,000 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chscp_HorizonMillingLlcMember
Ardent Mills LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investments | 204,400,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chscp_ArdentMillsLLCMember |  |
Ventura Foods, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investments | 331,600,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chscp_VenturaFoodsLlcMember |  |
Equity value exceeding carrying value | 12,900,000 us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chscp_VenturaFoodsLlcMember |  |
TEMCO, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investments | 63,500,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chscp_TemcoLlcMember |  |
National Cooperative Refinery Association [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage | 88.90%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage / us-gaap_BusinessAcquisitionAxis = chscp_NationalCooperativeRefineryAssociationMember |  | 84.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage / us-gaap_BusinessAcquisitionAxis = chscp_NationalCooperativeRefineryAssociationMember
Payments for Repurchase of Redeemable Noncontrolling Interest | (66,000,000)us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = chscp_NationalCooperativeRefineryAssociationMember | (66,000,000)us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = chscp_NationalCooperativeRefineryAssociationMember |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest | 121,070,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = chscp_NationalCooperativeRefineryAssociationMember |  |
Cargill, Inc. [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership of joint venture partner | 50.00%chscp_EquityMethodInvestmentThirdPartyOwnershipPercentage / us-gaap_CounterpartyNameAxis = chscp_CargillIncMember |  |
Crack Spread Contingent Payment [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Payments to Acquire Business, Contingent Consideration Paid |  | $ 16,500,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_ContingentConsiderationByTypeAxis = chscp_CrackSpreadContingentPaymentMember |
Corporate and Other | Ardent Mills [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage | 12.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chscp_ArdentMillsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  |
Corporate and Other | Ventura Foods, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chscp_VenturaFoodsLlcMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  |
Ag Business [Member] | TEMCO, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chscp_TemcoLlcMember / us-gaap_StatementBusinessSegmentsAxis = chscp_AgBusinessMember |  |

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