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Equities Changes in Equity (Details) (USD $) | 3 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 30, 2014 | Nov. 30, 2013 | Jun. 30, 2014 | Aug. 31, 2014 | Sep. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Reversal of prior year patronage and redemption estimates | $ 2,591,000 chscp_Reversalofprioryearpatronageandredemptionestimates |  |  |  |
Patronage distribution | (555,000)us-gaap_PatronageRefunds |  |  |  |
Equity Certificates Repurchased and Retired During Period, Value | (2,591,000)chscp_EquityCertificatesRepurchasedAndRetiredDuringPeriodValue |  |  |  |
Equities issued in business combinations | 488,528,000 chscp_EquityIssuedDuringPeriodValueNewIssues |  |  |  |
Dividends, Preferred Stock, Cash | (29,504,000)us-gaap_DividendsPreferredStockCash |  |  |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | (102,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders |  |  |  |
Other, net | (6,148,000)us-gaap_StockholdersEquityOther |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest | 378,331,000 us-gaap_ProfitLoss | 243,028,000 us-gaap_ProfitLoss |  |  |
Net income attributable to CHS Inc. | 378,703,000 us-gaap_NetIncomeLoss | 242,186,000 us-gaap_NetIncomeLoss |  |  |
Net income (loss) attributable to noncontrolling interests | (372,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 842,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  |  |
Other Comprehensive Income (Loss), Net of Tax | (1,087,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax | (434,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |
Patronage Refunds, Estimated | (109,300,000)chscp_PatronageRefundsEstimated |  |  |  |
Equity redemptions, estimate | (28,500,000)chscp_Equityredemptionsestimate |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 7,158,507,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  | 6,466,844,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |
Capital equity certificates [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Reversal of prior year patronage and redemption estimates | 2,591,000 chscp_Reversalofprioryearpatronageandredemptionestimates / us-gaap_StatementEquityComponentsAxis = chscp_CapitalEquityCertificatesMember |  |  |  |
Patronage distribution | 1,027,000 us-gaap_PatronageRefunds / us-gaap_StatementEquityComponentsAxis = chscp_CapitalEquityCertificatesMember |  |  |  |
Equity Certificates Repurchased and Retired During Period, Value | (2,565,000)chscp_EquityCertificatesRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = chscp_CapitalEquityCertificatesMember |  |  |  |
Equities issued in business combinations | 12,075,000 chscp_EquityIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = chscp_CapitalEquityCertificatesMember |  |  |  |
Dividends, Preferred Stock, Cash |  |  |  |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  |  |  |
Other, net | 4,000 us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = chscp_CapitalEquityCertificatesMember |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |
Patronage Refunds, Estimated |  |  |  |  |
Equity redemptions, estimate | (28,500,000)chscp_Equityredemptionsestimate / us-gaap_StatementEquityComponentsAxis = chscp_CapitalEquityCertificatesMember |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 3,493,105,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = chscp_CapitalEquityCertificatesMember |  |  | 3,508,473,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = chscp_CapitalEquityCertificatesMember |
Noncontrolling Interest [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Reversal of prior year patronage and redemption estimates | 0 chscp_Reversalofprioryearpatronageandredemptionestimates / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |
Patronage distribution | 0 us-gaap_PatronageRefunds / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |
Equity Certificates Repurchased and Retired During Period, Value | 0 chscp_EquityCertificatesRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |
Equities issued in business combinations |  |  |  |  |
Dividends, Preferred Stock, Cash |  |  |  |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders | (102,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |
Other, net | (6,163,000)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |
Net income (loss) attributable to noncontrolling interests | (372,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |
Patronage Refunds, Estimated |  |  |  |  |
Equity redemptions, estimate |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 11,699,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  | 18,336,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Nonpatronage Equity Certificates [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Reversal of prior year patronage and redemption estimates | 0 chscp_Reversalofprioryearpatronageandredemptionestimates / us-gaap_StatementEquityComponentsAxis = chscp_NonpatronageEquityCertificatesMember |  |  |  |
Patronage distribution | 0 us-gaap_PatronageRefunds / us-gaap_StatementEquityComponentsAxis = chscp_NonpatronageEquityCertificatesMember |  |  |  |
Equity Certificates Repurchased and Retired During Period, Value | (25,000)chscp_EquityCertificatesRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = chscp_NonpatronageEquityCertificatesMember |  |  |  |
Equities issued in business combinations |  |  |  |  |
Dividends, Preferred Stock, Cash |  |  |  |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  |  |  |
Other, net |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |
Patronage Refunds, Estimated |  |  |  |  |
Equity redemptions, estimate |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 23,231,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = chscp_NonpatronageEquityCertificatesMember |  |  | 23,256,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = chscp_NonpatronageEquityCertificatesMember |
Non-qualified Equity Certificates [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Reversal of prior year patronage and redemption estimates | 0 chscp_Reversalofprioryearpatronageandredemptionestimates / us-gaap_StatementEquityComponentsAxis = chscp_NonqualifiedEquityCertificatesMember |  |  |  |
Patronage distribution | 0 us-gaap_PatronageRefunds / us-gaap_StatementEquityComponentsAxis = chscp_NonqualifiedEquityCertificatesMember |  |  |  |
Equity Certificates Repurchased and Retired During Period, Value | (1,000)chscp_EquityCertificatesRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = chscp_NonqualifiedEquityCertificatesMember |  |  |  |
Equities issued in business combinations |  |  |  |  |
Dividends, Preferred Stock, Cash |  |  |  |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  |  |  |
Other, net |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |
Patronage Refunds, Estimated |  |  |  |  |
Equity redemptions, estimate |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 284,698,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = chscp_NonqualifiedEquityCertificatesMember |  |  | 284,699,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = chscp_NonqualifiedEquityCertificatesMember |
Preferred Stock [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Reversal of prior year patronage and redemption estimates | 0 chscp_Reversalofprioryearpatronageandredemptionestimates / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |
Patronage distribution | 0 us-gaap_PatronageRefunds / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |
Equity Certificates Repurchased and Retired During Period, Value | 0 chscp_EquityCertificatesRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |
Equities issued in business combinations | 476,453,000 chscp_EquityIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |
Dividends, Preferred Stock, Cash |  |  |  |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  |  |  |
Other, net |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |
Patronage Refunds, Estimated |  |  |  |  |
Equity redemptions, estimate |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 1,666,630,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  | 1,190,177,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Reversal of prior year patronage and redemption estimates | 0 chscp_Reversalofprioryearpatronageandredemptionestimates / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |
Patronage distribution | 0 us-gaap_PatronageRefunds / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |
Equity Certificates Repurchased and Retired During Period, Value | 0 chscp_EquityCertificatesRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |
Equities issued in business combinations |  |  |  |  |
Dividends, Preferred Stock, Cash |  |  |  |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  |  |  |
Other, net |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (1,087,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |
Patronage Refunds, Estimated |  |  |  |  |
Equity redemptions, estimate |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | (157,844,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  | (156,757,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Capital Reserves [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Reversal of prior year patronage and redemption estimates | 0 chscp_Reversalofprioryearpatronageandredemptionestimates / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Patronage distribution | (1,582,000)us-gaap_PatronageRefunds / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Equity Certificates Repurchased and Retired During Period, Value | 0 chscp_EquityCertificatesRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Equities issued in business combinations |  |  |  |  |
Dividends, Preferred Stock, Cash | (29,504,000)us-gaap_DividendsPreferredStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  |  |  |
Other, net | 11,000 us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Net income attributable to CHS Inc. | 378,703,000 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |
Patronage Refunds, Estimated | (109,300,000)chscp_PatronageRefundsEstimated / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Equity redemptions, estimate |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 1,836,988,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 1,598,660,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Class B Preferred Stock [Member] |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |
Value of Preferred Stock available to be sold under Shelf Registration |  |  | 2,000,000,000 chscp_PreferredstockValueregistered / us-gaap_StatementClassOfStockAxis = chscp_ClassBPreferredStockMember |  |
Class B, Series 3 Preferred Stock [Member] |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |
Preferred Stock, Redemption Amount |  |  |  |  | 492,500,000 us-gaap_PreferredStockRedemptionAmount / us-gaap_StatementClassOfStockAxis = chscp_ClassBSeries3PreferredStockMember
Proceeds from Issuance of Preferred Stock, net of Issuance Costs | $ 476,800,000 chscp_ProceedsfromIssuanceofPreferredStocknetofIssuanceCosts / us-gaap_StatementClassOfStockAxis = chscp_ClassBSeries3PreferredStockMember |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 6.75%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = chscp_ClassBSeries3PreferredStockMember |  |  |  |
Preferred Stock, Shares Issued |  |  |  |  | 19,700,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = chscp_ClassBSeries3PreferredStockMember
London Interbank Offered Rate (LIBOR) [Member] | Class B, Series 3 Preferred Stock [Member] |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |
Preferred Stock, Basis Spread on Dividend Rate Percentage | 4.155%chscp_PreferredStockBasisSpreadonDividendRatePercentage / us-gaap_StatementClassOfStockAxis = chscp_ClassBSeries3PreferredStockMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Class B, Series 3 Preferred Stock [Member] |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |
Preferred Stock, Basis Spread on Dividend Rate Percentage | 8.00%chscp_PreferredStockBasisSpreadonDividendRatePercentage / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = chscp_ClassBSeries3PreferredStockMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |

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