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Securities (Schedule Of Amortized Cost And Estimated Fair Value Of Securities Pledged As Collateral) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Amortized Cost [Member]    
Schedule of Amortized Cost and Estimated Fair Value of Securities Pledged as Collateral [Line Items]    
Securities pledged as collateral $ 1,013,916us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= cffn_AmortizedCostFairValueDisclosureMember		 $ 1,036,091us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= cffn_AmortizedCostFairValueDisclosureMember
Estimated Fair Value [Member]    
Schedule of Amortized Cost and Estimated Fair Value of Securities Pledged as Collateral [Line Items]    
Securities pledged as collateral 1,036,111us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 1,046,992us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
FHLB Borrowings [Member] | Amortized Cost [Member]    
Schedule of Amortized Cost and Estimated Fair Value of Securities Pledged as Collateral [Line Items]    
Securities pledged as collateral 443,886us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= cffn_AmortizedCostFairValueDisclosureMember
/ cffn_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesByTypeOfAgreementAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		 487,736us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= cffn_AmortizedCostFairValueDisclosureMember
/ cffn_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesByTypeOfAgreementAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
FHLB Borrowings [Member] | Estimated Fair Value [Member]    
Schedule of Amortized Cost and Estimated Fair Value of Securities Pledged as Collateral [Line Items]    
Securities pledged as collateral 449,834us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ cffn_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesByTypeOfAgreementAxis
= us-gaap_FederalHomeLoanBankAdvancesMember		 488,368us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ cffn_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesByTypeOfAgreementAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Public Unit Deposits [Member] | Amortized Cost [Member]    
Schedule of Amortized Cost and Estimated Fair Value of Securities Pledged as Collateral [Line Items]    
Securities pledged as collateral 311,122us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= cffn_AmortizedCostFairValueDisclosureMember
/ cffn_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesByTypeOfAgreementAxis
= cffn_PublicUnitDepositsMember		 282,464us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= cffn_AmortizedCostFairValueDisclosureMember
/ cffn_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesByTypeOfAgreementAxis
= cffn_PublicUnitDepositsMember
Public Unit Deposits [Member] | Estimated Fair Value [Member]    
Schedule of Amortized Cost and Estimated Fair Value of Securities Pledged as Collateral [Line Items]    
Securities pledged as collateral 316,217us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ cffn_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesByTypeOfAgreementAxis
= cffn_PublicUnitDepositsMember		 284,251us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ cffn_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesByTypeOfAgreementAxis
= cffn_PublicUnitDepositsMember
Repurchase Agreements [Member] | Amortized Cost [Member]    
Schedule of Amortized Cost and Estimated Fair Value of Securities Pledged as Collateral [Line Items]    
Securities pledged as collateral 236,276us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= cffn_AmortizedCostFairValueDisclosureMember
/ cffn_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesByTypeOfAgreementAxis
= us-gaap_RepurchaseAgreementsMember		 239,922us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= cffn_AmortizedCostFairValueDisclosureMember
/ cffn_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesByTypeOfAgreementAxis
= us-gaap_RepurchaseAgreementsMember
Repurchase Agreements [Member] | Estimated Fair Value [Member]    
Schedule of Amortized Cost and Estimated Fair Value of Securities Pledged as Collateral [Line Items]    
Securities pledged as collateral 246,341us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ cffn_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesByTypeOfAgreementAxis
= us-gaap_RepurchaseAgreementsMember		 247,306us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ cffn_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesByTypeOfAgreementAxis
= us-gaap_RepurchaseAgreementsMember
Federal Reserve Bank [Member] | Amortized Cost [Member]    
Schedule of Amortized Cost and Estimated Fair Value of Securities Pledged as Collateral [Line Items]    
Securities pledged as collateral 22,632us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= cffn_AmortizedCostFairValueDisclosureMember
/ cffn_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesByTypeOfAgreementAxis
= cffn_FederalReserveBankMember		 25,969us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= cffn_AmortizedCostFairValueDisclosureMember
/ cffn_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesByTypeOfAgreementAxis
= cffn_FederalReserveBankMember
Federal Reserve Bank [Member] | Estimated Fair Value [Member]    
Schedule of Amortized Cost and Estimated Fair Value of Securities Pledged as Collateral [Line Items]    
Securities pledged as collateral $ 23,719us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ cffn_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesByTypeOfAgreementAxis
= cffn_FederalReserveBankMember		 $ 27,067us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ cffn_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesByTypeOfAgreementAxis
= cffn_FederalReserveBankMember