2.4.1.9 Html 27 87 1 true 22 0 false 2 false false R1.htm 040000 - Disclosure - Risk/Return Detail Data {Elements} Sheet http://xbrl.sec.gov/rr/role/RiskReturnDetailData Risk/Return Detail Data false false R9999.htm Uncategorized Items Sheet Uncategorized Items true false All Reports Book All Reports Element dei:TradingSymbol in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element dei:TradingSymbol in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015522Member was not presented. Element dei:TradingSymbol in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015524Member was not presented. Element dei:TradingSymbol in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000087984Member was not presented. Element dei:TradingSymbol in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element dei:TradingSymbol in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087985Member was not presented. Element dei:TradingSymbol in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087986Member was not presented. Element dei:TradingSymbol in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087987Member was not presented. Element dei:TradingSymbol in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element dei:TradingSymbol in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element dei:TradingSymbol in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055489Member was not presented. Element dei:TradingSymbol in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055491Member was not presented. Element dei:TradingSymbol in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000087988Member was not presented. Element rr:AnnualFundOperatingExpensesTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:AnnualFundOperatingExpensesTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:AnnualFundOperatingExpensesTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:AnnualFundOperatingExpensesTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:AnnualReturn2004 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AnnualReturn2004 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AnnualReturn2004 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:AnnualReturn2004 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AnnualReturn2005 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AnnualReturn2005 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AnnualReturn2005 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:AnnualReturn2005 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AnnualReturn2006 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AnnualReturn2006 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AnnualReturn2006 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:AnnualReturn2006 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AnnualReturn2007 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AnnualReturn2007 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AnnualReturn2007 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:AnnualReturn2007 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AnnualReturn2008 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AnnualReturn2008 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AnnualReturn2008 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:AnnualReturn2008 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AnnualReturn2009 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AnnualReturn2009 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AnnualReturn2009 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:AnnualReturn2009 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AnnualReturn2010 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AnnualReturn2010 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AnnualReturn2010 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:AnnualReturn2010 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AnnualReturn2011 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AnnualReturn2011 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AnnualReturn2011 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:AnnualReturn2011 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AnnualReturn2012 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AnnualReturn2012 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AnnualReturn2012 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:AnnualReturn2012 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AnnualReturn2013 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AnnualReturn2013 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AnnualReturn2013 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:AnnualReturn2013 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AverageAnnualReturnInceptionDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AverageAnnualReturnInceptionDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015522Member was not presented. Element rr:AverageAnnualReturnInceptionDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015524Member was not presented. Element rr:AverageAnnualReturnInceptionDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000087984Member was not presented. Element rr:AverageAnnualReturnInceptionDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AverageAnnualReturnInceptionDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087985Member was not presented. Element rr:AverageAnnualReturnInceptionDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087986Member was not presented. Element rr:AverageAnnualReturnInceptionDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087987Member was not presented. Element rr:AverageAnnualReturnInceptionDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AverageAnnualReturnInceptionDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055489Member was not presented. Element rr:AverageAnnualReturnInceptionDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055491Member was not presented. Element rr:AverageAnnualReturnInceptionDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000087988Member was not presented. Element rr:AverageAnnualReturnInceptionDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsAndSalesMember_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AverageAnnualReturnInceptionDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsMember_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AverageAnnualReturnInceptionDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsAndSalesMember_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AverageAnnualReturnInceptionDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsMember_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AverageAnnualReturnInceptionDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsAndSalesMember_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AverageAnnualReturnInceptionDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsMember_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_PerformanceMeasureAxis_cik0000717316_BarclaysMunicipalBondIndexMember was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015522Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015524Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000087984Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_PerformanceMeasureAxis_cik0000717316_Barclays7YearMunicipalBondIndexMember was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087985Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087986Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087987Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_PerformanceMeasureAxis_cik0000717316_BarclaysMunicipalBondIndexMember was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055489Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055491Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000087988Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsAndSalesMember_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsMember_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsAndSalesMember_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsMember_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsAndSalesMember_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AverageAnnualReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsMember_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AverageAnnualReturnSinceInception in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000087984Member was not presented. Element rr:AverageAnnualReturnSinceInception in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087985Member was not presented. Element rr:AverageAnnualReturnSinceInception in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055489Member was not presented. Element rr:AverageAnnualReturnSinceInception in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055491Member was not presented. Element rr:AverageAnnualReturnSinceInception in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000087988Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_PerformanceMeasureAxis_cik0000717316_BarclaysMunicipalBondIndexMember was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015522Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015524Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000087984Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_PerformanceMeasureAxis_cik0000717316_Barclays7YearMunicipalBondIndexMember was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087985Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087986Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087987Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_PerformanceMeasureAxis_cik0000717316_BarclaysMunicipalBondIndexMember was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055489Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055491Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000087988Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsAndSalesMember_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsMember_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsAndSalesMember_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsMember_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsAndSalesMember_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AverageAnnualReturnYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsMember_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_PerformanceMeasureAxis_cik0000717316_BarclaysMunicipalBondIndexMember was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015522Member was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015524Member was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_PerformanceMeasureAxis_cik0000717316_Barclays7YearMunicipalBondIndexMember was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087986Member was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087987Member was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_PerformanceMeasureAxis_cik0000717316_BarclaysMunicipalBondIndexMember was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055489Member was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055491Member was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsAndSalesMember_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsMember_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsAndSalesMember_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsMember_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsAndSalesMember_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AverageAnnualReturnYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsMember_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AverageAnnualReturnYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_PerformanceMeasureAxis_cik0000717316_BarclaysMunicipalBondIndexMember was not presented. Element rr:AverageAnnualReturnYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AverageAnnualReturnYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015522Member was not presented. Element rr:AverageAnnualReturnYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015524Member was not presented. Element rr:AverageAnnualReturnYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_PerformanceMeasureAxis_cik0000717316_Barclays7YearMunicipalBondIndexMember was not presented. Element rr:AverageAnnualReturnYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AverageAnnualReturnYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087986Member was not presented. Element rr:AverageAnnualReturnYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087987Member was not presented. Element rr:AverageAnnualReturnYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:AverageAnnualReturnYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_PerformanceMeasureAxis_cik0000717316_BarclaysMunicipalBondIndexMember was not presented. Element rr:AverageAnnualReturnYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AverageAnnualReturnYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsAndSalesMember_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AverageAnnualReturnYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsMember_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:AverageAnnualReturnYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsAndSalesMember_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AverageAnnualReturnYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsMember_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:AverageAnnualReturnYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsAndSalesMember_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:AverageAnnualReturnYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_PerformanceMeasureAxis_rr_AfterTaxesOnDistributionsMember_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:BarChartAndPerformanceTableHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:BarChartAndPerformanceTableHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:BarChartAndPerformanceTableHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:BarChartAndPerformanceTableHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:BarChartClosingTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:BarChartClosingTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:BarChartClosingTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:BarChartClosingTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:BarChartDoesNotReflectSalesLoads in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:BarChartDoesNotReflectSalesLoads in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:BarChartDoesNotReflectSalesLoads in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:BarChartDoesNotReflectSalesLoads in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:BarChartHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:BarChartHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:BarChartHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:BarChartHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:BarChartHighestQuarterlyReturn in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:BarChartHighestQuarterlyReturn in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:BarChartHighestQuarterlyReturn in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:BarChartHighestQuarterlyReturn in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:BarChartHighestQuarterlyReturnDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:BarChartHighestQuarterlyReturnDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:BarChartHighestQuarterlyReturnDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:BarChartHighestQuarterlyReturnDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:BarChartLowestQuarterlyReturn in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:BarChartLowestQuarterlyReturn in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:BarChartLowestQuarterlyReturn in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:BarChartLowestQuarterlyReturn in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:BarChartLowestQuarterlyReturnDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:BarChartLowestQuarterlyReturnDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:BarChartLowestQuarterlyReturnDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:BarChartLowestQuarterlyReturnDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:BarChartTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:BarChartTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:BarChartTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:BarChartTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:BarChartYearToDateReturn in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:BarChartYearToDateReturn in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:BarChartYearToDateReturn in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:BarChartYearToDateReturn in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:BarChartYearToDateReturnDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:BarChartYearToDateReturnDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:BarChartYearToDateReturnDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:BarChartYearToDateReturnDate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:DistributionAndService12b1FeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:DistributionAndService12b1FeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015522Member was not presented. Element rr:DistributionAndService12b1FeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015524Member was not presented. Element rr:DistributionAndService12b1FeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000087984Member was not presented. Element rr:DistributionAndService12b1FeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:DistributionAndService12b1FeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087985Member was not presented. Element rr:DistributionAndService12b1FeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087986Member was not presented. Element rr:DistributionAndService12b1FeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087987Member was not presented. Element rr:DistributionAndService12b1FeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:DistributionAndService12b1FeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:DistributionAndService12b1FeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055489Member was not presented. Element rr:DistributionAndService12b1FeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055491Member was not presented. Element rr:DistributionAndService12b1FeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000087988Member was not presented. Element rr:ExpenseBreakpointDiscounts in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:ExpenseBreakpointDiscounts in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:ExpenseBreakpointDiscounts in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:ExpenseBreakpointMinimumInvestmentRequiredAmount in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:ExpenseBreakpointMinimumInvestmentRequiredAmount in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:ExpenseBreakpointMinimumInvestmentRequiredAmount in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:ExpenseExampleByYearCaption in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:ExpenseExampleByYearCaption in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:ExpenseExampleByYearCaption in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:ExpenseExampleByYearCaption in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:ExpenseExampleHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:ExpenseExampleHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:ExpenseExampleHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:ExpenseExampleHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:ExpenseExampleNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:ExpenseExampleNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:ExpenseExampleNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:ExpenseExampleNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:ExpenseExampleWithRedemptionTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:ExpenseExampleWithRedemptionTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:ExpenseExampleWithRedemptionTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:ExpenseExampleWithRedemptionTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:ExpenseExampleYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:ExpenseExampleYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015522Member was not presented. Element rr:ExpenseExampleYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015524Member was not presented. Element rr:ExpenseExampleYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000087984Member was not presented. Element rr:ExpenseExampleYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:ExpenseExampleYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087985Member was not presented. Element rr:ExpenseExampleYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087986Member was not presented. Element rr:ExpenseExampleYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087987Member was not presented. Element rr:ExpenseExampleYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:ExpenseExampleYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:ExpenseExampleYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055489Member was not presented. Element rr:ExpenseExampleYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055491Member was not presented. Element rr:ExpenseExampleYear01 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000087988Member was not presented. Element rr:ExpenseExampleYear03 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:ExpenseExampleYear03 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015522Member was not presented. Element rr:ExpenseExampleYear03 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015524Member was not presented. Element rr:ExpenseExampleYear03 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000087984Member was not presented. Element rr:ExpenseExampleYear03 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:ExpenseExampleYear03 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087985Member was not presented. Element rr:ExpenseExampleYear03 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087986Member was not presented. Element rr:ExpenseExampleYear03 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087987Member was not presented. Element rr:ExpenseExampleYear03 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:ExpenseExampleYear03 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:ExpenseExampleYear03 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055489Member was not presented. Element rr:ExpenseExampleYear03 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055491Member was not presented. Element rr:ExpenseExampleYear03 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000087988Member was not presented. Element rr:ExpenseExampleYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:ExpenseExampleYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015522Member was not presented. Element rr:ExpenseExampleYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015524Member was not presented. Element rr:ExpenseExampleYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000087984Member was not presented. Element rr:ExpenseExampleYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:ExpenseExampleYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087985Member was not presented. Element rr:ExpenseExampleYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087986Member was not presented. Element rr:ExpenseExampleYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087987Member was not presented. Element rr:ExpenseExampleYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:ExpenseExampleYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:ExpenseExampleYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055489Member was not presented. Element rr:ExpenseExampleYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055491Member was not presented. Element rr:ExpenseExampleYear05 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000087988Member was not presented. Element rr:ExpenseExampleYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:ExpenseExampleYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015522Member was not presented. Element rr:ExpenseExampleYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015524Member was not presented. Element rr:ExpenseExampleYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000087984Member was not presented. Element rr:ExpenseExampleYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:ExpenseExampleYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087985Member was not presented. Element rr:ExpenseExampleYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087986Member was not presented. Element rr:ExpenseExampleYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087987Member was not presented. Element rr:ExpenseExampleYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:ExpenseExampleYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:ExpenseExampleYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055489Member was not presented. Element rr:ExpenseExampleYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055491Member was not presented. Element rr:ExpenseExampleYear10 in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000087988Member was not presented. Element rr:ExpenseHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:ExpenseHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:ExpenseHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:ExpenseHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:ExpenseNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:ExpenseNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:ExpenseNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:ExpenseNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:ExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:ExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015522Member was not presented. Element rr:ExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015524Member was not presented. Element rr:ExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000087984Member was not presented. Element rr:ExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:ExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087985Member was not presented. Element rr:ExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087986Member was not presented. Element rr:ExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087987Member was not presented. Element rr:ExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:ExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:ExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055489Member was not presented. Element rr:ExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055491Member was not presented. Element rr:ExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000087988Member was not presented. Element rr:HighestQuarterlyReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:HighestQuarterlyReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:HighestQuarterlyReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:HighestQuarterlyReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:IndexNoDeductionForFeesExpensesTaxes in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_PerformanceMeasureAxis_cik0000717316_BarclaysMunicipalBondIndexMember was not presented. Element rr:IndexNoDeductionForFeesExpensesTaxes in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_PerformanceMeasureAxis_cik0000717316_Barclays7YearMunicipalBondIndexMember was not presented. Element rr:IndexNoDeductionForFeesExpensesTaxes in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_PerformanceMeasureAxis_cik0000717316_BarclaysMunicipalBondIndexMember was not presented. Element rr:LowestQuarterlyReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:LowestQuarterlyReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:LowestQuarterlyReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:LowestQuarterlyReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:ManagementFeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:ManagementFeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015522Member was not presented. Element rr:ManagementFeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015524Member was not presented. Element rr:ManagementFeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000087984Member was not presented. Element rr:ManagementFeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:ManagementFeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087985Member was not presented. Element rr:ManagementFeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087986Member was not presented. Element rr:ManagementFeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087987Member was not presented. Element rr:ManagementFeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:ManagementFeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:ManagementFeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055489Member was not presented. Element rr:ManagementFeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055491Member was not presented. Element rr:ManagementFeesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000087988Member was not presented. Element rr:MaximumAccountFee in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:MaximumAccountFee in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015522Member was not presented. Element rr:MaximumAccountFee in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015524Member was not presented. Element rr:MaximumAccountFee in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000087984Member was not presented. Element rr:MaximumAccountFee in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:MaximumAccountFee in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087985Member was not presented. Element rr:MaximumAccountFee in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087986Member was not presented. Element rr:MaximumAccountFee in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087987Member was not presented. Element rr:MaximumAccountFee in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:MaximumAccountFee in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:MaximumAccountFee in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055489Member was not presented. Element rr:MaximumAccountFee in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055491Member was not presented. Element rr:MaximumAccountFee in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000087988Member was not presented. Element rr:MaximumDeferredSalesChargeOverOther in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:MaximumDeferredSalesChargeOverOther in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015522Member was not presented. Element rr:MaximumDeferredSalesChargeOverOther in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015524Member was not presented. Element rr:MaximumDeferredSalesChargeOverOther in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000087984Member was not presented. Element rr:MaximumDeferredSalesChargeOverOther in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:MaximumDeferredSalesChargeOverOther in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087985Member was not presented. Element rr:MaximumDeferredSalesChargeOverOther in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087986Member was not presented. Element rr:MaximumDeferredSalesChargeOverOther in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087987Member was not presented. Element rr:MaximumDeferredSalesChargeOverOther in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:MaximumDeferredSalesChargeOverOther in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055489Member was not presented. Element rr:MaximumDeferredSalesChargeOverOther in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055491Member was not presented. Element rr:MaximumDeferredSalesChargeOverOther in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000087988Member was not presented. Element rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015522Member was not presented. Element rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015524Member was not presented. Element rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000087984Member was not presented. Element rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087985Member was not presented. Element rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087986Member was not presented. Element rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087987Member was not presented. Element rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055489Member was not presented. Element rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055491Member was not presented. Element rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000087988Member was not presented. Element rr:ObjectiveHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:ObjectiveHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:ObjectiveHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:ObjectiveHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:ObjectivePrimaryTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:ObjectivePrimaryTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:ObjectivePrimaryTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:ObjectivePrimaryTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:OperatingExpensesCaption in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:OperatingExpensesCaption in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:OperatingExpensesCaption in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:OperatingExpensesCaption in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:OtherExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:OtherExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015522Member was not presented. Element rr:OtherExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015524Member was not presented. Element rr:OtherExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000087984Member was not presented. Element rr:OtherExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:OtherExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087985Member was not presented. Element rr:OtherExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087986Member was not presented. Element rr:OtherExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000087987Member was not presented. Element rr:OtherExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:OtherExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. Element rr:OtherExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055489Member was not presented. Element rr:OtherExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000055491Member was not presented. Element rr:OtherExpensesOverAssets in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000087988Member was not presented. Element rr:PerformanceAvailabilityWebSiteAddress in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:PerformanceAvailabilityWebSiteAddress in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:PerformanceAvailabilityWebSiteAddress in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:PerformanceAvailabilityWebSiteAddress in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:PerformanceInformationIllustratesVariabilityOfReturns in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:PerformanceInformationIllustratesVariabilityOfReturns in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:PerformanceInformationIllustratesVariabilityOfReturns in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:PerformanceInformationIllustratesVariabilityOfReturns in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:PerformanceNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:PerformanceNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:PerformanceNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:PerformanceNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:PerformancePastDoesNotIndicateFuture in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:PerformancePastDoesNotIndicateFuture in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:PerformancePastDoesNotIndicateFuture in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:PerformancePastDoesNotIndicateFuture in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:PerformanceTableClosingTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:PerformanceTableClosingTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:PerformanceTableClosingTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:PerformanceTableHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:PerformanceTableHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:PerformanceTableHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:PerformanceTableHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:PerformanceTableNotRelevantToTaxDeferred in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:PerformanceTableNotRelevantToTaxDeferred in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:PerformanceTableNotRelevantToTaxDeferred in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:PerformanceTableOneClassOfAfterTaxShown in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:PerformanceTableOneClassOfAfterTaxShown in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:PerformanceTableOneClassOfAfterTaxShown in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:PerformanceTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:PerformanceTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:PerformanceTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:PerformanceTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:PerformanceTableUsesHighestFederalRate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:PerformanceTableUsesHighestFederalRate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:PerformanceTableUsesHighestFederalRate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:PortfolioTurnoverHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:PortfolioTurnoverHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:PortfolioTurnoverHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:PortfolioTurnoverRate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:PortfolioTurnoverRate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:PortfolioTurnoverRate in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:PortfolioTurnoverTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:PortfolioTurnoverTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:PortfolioTurnoverTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:RiskHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:RiskHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:RiskHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:RiskHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:RiskLoseMoney in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:RiskLoseMoney in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:RiskLoseMoney in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:RiskLoseMoney in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:RiskMoneyMarketFund in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:RiskNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:RiskNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:RiskNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:RiskNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:RiskNondiversifiedStatus in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:RiskNotInsuredDepositoryInstitution in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:RiskNotInsuredDepositoryInstitution in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:RiskNotInsuredDepositoryInstitution in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:RiskNotInsuredDepositoryInstitution in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:RiskReturnHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:RiskReturnHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:RiskReturnHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:RiskReturnHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:ShareholderFeesCaption in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:ShareholderFeesCaption in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:ShareholderFeesCaption in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:ShareholderFeesCaption in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:ShareholderFeesTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:ShareholderFeesTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:ShareholderFeesTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:ShareholderFeesTableTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:StrategyHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:StrategyHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:StrategyHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:StrategyHeading in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:StrategyNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member was not presented. Element rr:StrategyNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member was not presented. Element rr:StrategyNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member was not presented. Element rr:StrategyNarrativeTextBlock in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member was not presented. Element rr:YearToDateReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005667Member_rr_ProspectusShareClassAxis_cik0000717316_C000015521Member was not presented. Element rr:YearToDateReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005668Member_rr_ProspectusShareClassAxis_cik0000717316_C000015525Member was not presented. Element rr:YearToDateReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005669Member_rr_ProspectusShareClassAxis_cik0000717316_C000015526Member was not presented. Element rr:YearToDateReturnLabel in context D2015Q1Jan1_dei_DocumentInformationDocumentAxis_cik0000717316_AmericanCenturyCaliforniaTax-FreeandMunicipalFundsMember_dei_LegalEntityAxis_cik0000717316_S000005670Member_rr_ProspectusShareClassAxis_cik0000717316_C000015527Member was not presented. cik0000717316-20150101.xml cik0000717316-20150101.xsd cik0000717316-20150101_cal.xml cik0000717316-20150101_def.xml cik0000717316-20150101_lab.xml cik0000717316-20150101_pre.xml true true