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Notes Payable and Long-Term Debt - Footnote Narrative (Details) (USD $)
3 Months Ended 6 Months Ended
Feb. 28, 2014
Feb. 28, 2014
Feb. 28, 2015
Aug. 31, 2014
Debt Instrument [Line Items]        
Notes payable     $ 1,361,615,000us-gaap_ShortTermBankLoansAndNotesPayable $ 1,159,473,000us-gaap_ShortTermBankLoansAndNotesPayable
CHS Capital notes payable        
Debt Instrument [Line Items]        
Notes payable     345,832,000us-gaap_ShortTermBankLoansAndNotesPayable
/ us-gaap_ShortTermDebtTypeAxis
= chscp_ChsCapitalNotesPayableMember
318,774,000us-gaap_ShortTermBankLoansAndNotesPayable
/ us-gaap_ShortTermDebtTypeAxis
= chscp_ChsCapitalNotesPayableMember
Notes payable        
Debt Instrument [Line Items]        
Notes payable     1,015,783,000us-gaap_ShortTermBankLoansAndNotesPayable
/ us-gaap_ShortTermDebtTypeAxis
= chscp_NotesPayableMember
840,699,000us-gaap_ShortTermBankLoansAndNotesPayable
/ us-gaap_ShortTermDebtTypeAxis
= chscp_NotesPayableMember
Five-Year Revolving Facilities [Member] | Line of Credit [Member] | Revolving credit facility        
Debt Instrument [Line Items]        
Line of Credit Facility, Current Borrowing Capacity     2,500,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= chscp_FiveYearRevolvingFacilitiesMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Long-term Line of Credit     0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= chscp_FiveYearRevolvingFacilitiesMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Debt Instrument [Line Items]        
Gain on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring $ 13,500,000us-gaap_GainOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurring
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
$ 13,500,000us-gaap_GainOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurring
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember