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  <rr:ExpenseExampleByYearCaption contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-CC3127F9A81A62688D08F1B90E8B98AF">The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods, that you earn a 5% return each year, and that the fund&#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleByYearCaption>
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  <rr:ExpenseExchangeTradedFundCommissions contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-477F315DA0F115F7A62D37812A436BE9">You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.</rr:ExpenseExchangeTradedFundCommissions>
  <rr:ExpenseExchangeTradedFundCommissions contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-D60F32DD5A5ACD28B615378213B53ADA">You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.</rr:ExpenseExchangeTradedFundCommissions>
  <rr:ExpenseHeading contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-70B82ED29D9D8A4AD3913226D25C6D5D">Fees and Expenses</rr:ExpenseHeading>
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  <rr:ExpenseNarrativeTextBlock contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-298764F5761BDC862680F1B90E8BF6C5">&lt;div style="font-family:Times New Roman;font-size:10pt;"&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;The following table describes the fees and expenses you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. &lt;/font&gt;&lt;/div&gt;&lt;/div&gt;</rr:ExpenseNarrativeTextBlock>
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  <rr:ObjectiveHeading contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-ACEEAAAF81691924ACC232264D8A7635">Investment Objective</rr:ObjectiveHeading>
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  <rr:OperatingExpensesCaption contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-3FA0048296198E3BBCC43281A4B719DC">Annual Fund Operating Expenses&#160;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:OperatingExpensesCaption contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-3DBD51C4DFC4AF9FBDA6329B8A19CA41">Annual Fund Operating Expenses&#160;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:OtherExpensesNewFundBasedOnEstimates contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-F8B677DED88D4BEFA50B3780F7BB07CF">Other expenses are based on estimated amounts for the current fiscal year.</rr:OtherExpensesNewFundBasedOnEstimates>
  <rr:OtherExpensesNewFundBasedOnEstimates contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-B1A19A6F3516DBA3D6CA37825DA8AF19">Other expenses are based on estimated amounts for the current fiscal year.</rr:OtherExpensesNewFundBasedOnEstimates>
  <rr:OtherExpensesOverAssets contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member_rr_ProspectusShareClassAxis_ck0000746458_C000218416Member" decimals="4" id="Fact-DC74940F1AFB9365CD407F8C88B892F7" unitRef="number">0.0000</rr:OtherExpensesOverAssets>
  <rr:OtherExpensesOverAssets contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member_rr_ProspectusShareClassAxis_ck0000746458_C000218417Member" decimals="4" id="Fact-4E0CF4C37F807546E2B67F88D9100AFB" unitRef="number">0.0000</rr:OtherExpensesOverAssets>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-3F6C5F9BF916CE72B0433235EA9F2FD9">americancentury.com</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-03EB41427A77C3D01ADD3294AC1DA12C">americancentury.com</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:PerformanceNarrativeTextBlock contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-F1D054BC2F3D9224FD313236C0FB0DA3">&lt;div style="font-family:Times New Roman;font-size:10pt;"&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;The fund&amp;#8217;s performance history is not available as of the date of this prospectus. When the fund has investment results for a full calendar year, this section will feature charts that show annual total returns, highest and lowest quarterly returns and average annual total returns for the fund. This information indicates the volatility of the fund&amp;#8217;s historical returns from year to year. For current performance information, please visit americancentury.com.&lt;/font&gt;&lt;/div&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;Performance information is designed to help you see how fund returns can vary. Keep in mind that past performance (before and after taxes) does not predict how the fund will perform in the future.&lt;/font&gt;&lt;/div&gt;&lt;/div&gt;</rr:PerformanceNarrativeTextBlock>
  <rr:PerformanceNarrativeTextBlock contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-9E188568562BF650306EF1B90E7B862E">&lt;div style="font-family:Times New Roman;font-size:10pt;"&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;The fund&amp;#8217;s performance history is not available as of the date of this prospectus. When the fund has investment results for a full calendar year, this section will feature charts that show annual total returns, highest and lowest quarterly returns and average annual total returns for the fund. This information indicates the volatility of the fund&amp;#8217;s historical returns from year to year. For current performance information, please visit americancentury.com.&lt;/font&gt;&lt;/div&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;Performance information is designed to help you see how fund returns can vary. Keep in mind that past performance (before and after taxes) does not predict how the fund will perform in the future.&lt;/font&gt;&lt;/div&gt;&lt;/div&gt;</rr:PerformanceNarrativeTextBlock>
  <rr:PerformanceOneYearOrLess contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-1E5FDE99C0CC6FFA082D32366FFC2E15">The fund&#8217;s performance history is not available as of the date of this prospectus.</rr:PerformanceOneYearOrLess>
  <rr:PerformanceOneYearOrLess contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-2921D7814F1BC8649DBB3296260B8037">The fund&#8217;s performance history is not available as of the date of this prospectus. </rr:PerformanceOneYearOrLess>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-CCC2AFDDF8C9FDA9EB6C377F8A0EAC75">Keep in mind that past performance (before and after taxes) does not predict how the fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-1C10B0B25175CB582E0DF1B90E8B729B">Keep in mind that past performance (before and after taxes) does not predict how the fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:PortfolioTurnoverHeading contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-3955BB812127777E2D79F1B90F65EC30">Portfolio Turnover</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverHeading contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-776F0644FA42E14014C8F1B90E8BAA8F">Portfolio Turnover</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-2FA04CBE7BED8FCEF568322D86926B3B">&lt;div style="font-family:Times New Roman;font-size:10pt;"&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;The fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund&amp;#8217;s performance. Because the fund is new, the fund&amp;#8217;s portfolio turnover is not available.&lt;/font&gt;&lt;/div&gt;&lt;/div&gt;</rr:PortfolioTurnoverTextBlock>
  <rr:PortfolioTurnoverTextBlock contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-0EA4F1E18A3985C455ACF1B90E8BA8DD">&lt;div style="font-family:Times New Roman;font-size:10pt;"&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;The fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund&amp;#8217;s performance. Because the fund is new, the fund&amp;#8217;s portfolio turnover is not available.&lt;/font&gt;&lt;/div&gt;&lt;/div&gt;</rr:PortfolioTurnoverTextBlock>
  <rr:ProspectusDate contextRef="D2020Q2APR02-APR02" id="Fact-949EC537E1A8DBDF6696F1B90D914E26">2020-04-02</rr:ProspectusDate>
  <rr:RiskHeading contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-92390216F237C20F1FF3323185565542">Principal Risks</rr:RiskHeading>
  <rr:RiskHeading contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-143D1F4BC25B893C5978F1B90E8B7DDD">Principal Risks</rr:RiskHeading>
  <rr:RiskLoseMoney contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-3991BC093040405F8EBE3237C76EB5F0">Principal Loss&#160;&#8211;&#160;At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.</rr:RiskLoseMoney>
  <rr:RiskLoseMoney contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-9574A2433B6CE1EFD085F1B90E8B29CF">Principal Loss&#160;&#8211;&#160;At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.</rr:RiskLoseMoney>
  <rr:RiskNarrativeTextBlock contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-13F3A28FE1F06D8083FBF1B90F75BCD6">&lt;div style="font-family:Times New Roman;font-size:10pt;"&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;Credit Risk&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#160;&amp;#8211; Debt securities, even investment-grade debt securities, are subject to credit risk. Credit risk is the risk that the inability or perceived inability of the issuer to make interest and principal payments will cause the value of the securities to decrease. As a result, the fund&amp;#8217;s share price could also decrease. Changes in the credit rating of a debt security held by the fund could have a similar effect. The fund&amp;#8217;s investments often have high credit risk, which helps the fund pursue a higher yield than more conservatively managed bond funds. &lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;Below Investment-Grade Securities Risk&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt; &amp;#8211; Issuers of lower rated, high-yield securities are more vulnerable to real or perceived economic changes (such as an economic downturn or a prolonged period of rising interest rates), political changes, or adverse developments specific to the issuer. Adverse economic, political and other developments may be more likely to cause an issuer of low-quality bonds to default on its obligation to pay interest and principal due under its securities. The fund invests a significant part of its assets in securities rated below investment-grade or that are unrated, including bonds that are in technical or monetary default. By definition, the issuers of many of these securities have had and may continue to have problems making interest and principal payments. &lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;Such securities are also speculative. &lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;Interest Rate Risk&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#160;&amp;#8211; When interest rates change, the fund&amp;#8217;s share value will be affected. Generally, the value of debt securities and the funds that hold them decline as interest rates rise. Because the fund typically invests in intermediate-term and long-term bonds, the fund&amp;#8217;s interest rate risk is generally higher than for funds with shorter-weighted average maturities, such as money market and short-term bond funds. A period of rising interest rates may negatively affect the fund&amp;#8217;s performance.&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;California Economic Risk&amp;#160;&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8211; The fund will be sensitive to events that affect California&amp;#8217;s economy. Significant political or economic developments in California will likely impact virtually all municipal securities issued in the state. Because the fund invests principally in California municipal securities, it may have a higher level of risk than funds that invest in a larger universe of securities.&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;Municipal Securities Risk&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#160;&amp;#8211; Because the fund invests principally in municipal securities, it will be sensitive to events that affect municipal markets, including legislative or political changes and the financial condition of the issuers of municipal securities. The fund may have a higher level of risk than funds that invest in a larger universe of securities.&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;Liquidity Risk&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#160;&amp;#8211; The fund may also be subject to liquidity risk. During periods of market turbulence or unusually low trading activity, in order to meet redemptions, it may be necessary for the fund to sell securities at prices that could have an adverse effect on the fund&amp;#8217;s share price. Changing regulatory and market conditions, including increases in interest rates and credit spreads may adversely affect the liquidity of the fund&amp;#8217;s investments.&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;Tax Risk&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#160;&amp;#8211; Some or all of the fund&amp;#8217;s income may be subject to the federal alternative minimum tax. There is no guarantee that all of the fund&amp;#8217;s income will remain exempt from federal or state income taxes. Income from municipal bonds held by a fund could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service or state tax authorities, or non-compliant conduct of a bond issuer. The fund may sell securities that lose their tax-exempt statuses at inopportune times, which may cause tax consequences or a decrease in the fund&amp;#8217;s value.&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;Market Risk&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#160;&amp;#8211;&amp;#160;The value of securities owned by the fund may go up and down, sometimes rapidly or unpredictably. &lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;Market risks, including political, regulatory, economic and social developments, can affect the value of the fund&amp;#8217;s investments. Natural disasters, public health emergencies, terrorism and other unforeseeable events may lead to increased market volatility and may have adverse long-term effects on world economies and markets generally.&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;Redemption Risk&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#160;&amp;#8211; The fund may need to sell securities at times it would not otherwise do so in order to meet shareholder redemption requests. Selling securities to meet such redemptions may cause the fund to experience a loss, increase the fund&amp;#8217;s transaction costs or have tax consequences. To the extent that a large shareholder (including a fund of funds) invests in the fund, the fund may experience relatively large redemptions as such shareholder reallocates its assets.&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;Principal Loss&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#160;&amp;#8211;&amp;#160;At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.&amp;#160;&lt;/font&gt;&lt;/div&gt;&lt;/div&gt;</rr:RiskNarrativeTextBlock>
  <rr:RiskNarrativeTextBlock contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-E87EA994ECBB0F2E001BF1B90E8B51C5">&lt;div style="font-family:Times New Roman;font-size:10pt;"&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;Credit Risk&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#160;&amp;#8211; Debt securities, even investment-grade debt securities, are subject to credit risk. Credit risk is the risk that the inability or perceived inability of the issuer to make interest and principal payments will cause the value of the securities to decrease. As a result, the fund&amp;#8217;s share price could also decrease. Changes in the credit rating of a debt security held by the fund could have a similar effect. The fund&amp;#8217;s investments often have high credit risk, which helps the fund pursue a higher yield than more conservatively managed bond funds. &lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;Below Investment-Grade Securities Risk&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt; &amp;#8211; Issuers of lower rated, high-yield securities are more vulnerable to real or perceived economic changes (such as an economic downturn or a prolonged period of rising interest rates), political changes, or adverse developments specific to the issuer. Adverse economic, political and other developments may be more likely to cause an issuer of low-quality bonds to default on its obligation to pay interest and principal due under its securities. The fund invests a significant part of its assets in securities rated below investment-grade or that are unrated, including bonds that are in technical or monetary default. By definition, the issuers of many of these securities have had and may continue to have problems making interest and principal payments. &lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;Such securities are also speculative. &lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;Interest Rate Risk&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#160;&amp;#8211; When interest rates change, the fund&amp;#8217;s share value will be affected. Generally, the value of debt securities and the funds that hold them decline as interest rates rise. Because the fund typically invests in intermediate-term and long-term bonds, the fund&amp;#8217;s interest rate risk is generally higher than for funds with shorter-weighted average maturities, such as money market and short-term bond funds. A period of rising interest rates may negatively affect the fund&amp;#8217;s performance.&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;Liquidity Risk&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#160;&amp;#8211; The fund may also be subject to liquidity risk. During periods of market turbulence or unusually low trading activity, to meet redemptions, it may be necessary for the fund to sell securities at prices that could have an adverse effect on the fund&amp;#8217;s share price. Changing regulatory and market conditions, including increases in interest rates and credit spreads may adversely affect the liquidity of the fund&amp;#8217;s investments.&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;Municipal Securities Risk&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#160;&amp;#8211; Because the fund invests principally in municipal securities, it will be sensitive to events that affect municipal markets, including legislative or political changes and the financial condition of the issuers of municipal securities. The fund may have a higher level of risk than funds that invest in a larger universe of securities.&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;Tax Risk&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#160;&amp;#8211; Some or all of the fund&amp;#8217;s income may be subject to the federal alternative minimum tax. There is no guarantee that all of the fund&amp;#8217;s income will remain exempt from federal or state income taxes. Income from municipal bonds held by a fund could be declared taxable because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service or state tax authorities, or noncompliant conduct of a bond issuer. The fund may sell securities that lose their tax-exempt statuses at inopportune times, which may cause tax consequences or a decrease in the fund&amp;#8217;s value.&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;Market Risk&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#160;&amp;#8211;&amp;#160;The risk that the value of securities owned by the fund may go up and down, sometimes rapidly or unpredictably. &lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;Market risks, including political, regulatory, economic and social developments, can affect the value of the fund&amp;#8217;s investments. Natural disasters, public health emergencies, terrorism and other unforeseeable events may lead to increased market volatility and may have adverse long-term effects on world economies and markets generally.&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;Redemption Risk&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#160;&amp;#8211; The fund may need to sell securities at times it would not otherwise do so in order to meet shareholder redemption requests. Selling securities to meet such redemptions may cause the fund to experience a loss, increase the fund&amp;#8217;s transaction costs or have tax consequences. To the extent that a large shareholder (including a fund of funds) invests in the fund, the fund may experience relatively large redemptions as such shareholder reallocates its assets.&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="0" cellspacing="0" style="padding-top:4px;padding-bottom:4px;font-family:Times New Roman; font-size:10pt;"&gt;&lt;tr&gt;&lt;td style="width:12px;" rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;td rowspan="1" colspan="1"&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;padding-left:0px;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#8226;&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;td style="vertical-align:top;" rowspan="1" colspan="1"&gt;&lt;div style="line-height:120%;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;font-weight:bold;"&gt;Principal Loss&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;&amp;#160;&amp;#8211;&amp;#160;At any given time your shares may be worth less than the price you paid for them. In other words, it is possible to lose money by investing in the fund.&lt;/font&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.&lt;/font&gt;&lt;/div&gt;&lt;/div&gt;</rr:RiskNarrativeTextBlock>
  <rr:RiskNotInsuredDepositoryInstitution contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-773CEFD27E15AD4615923238032721D0">An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.&#160;</rr:RiskNotInsuredDepositoryInstitution>
  <rr:RiskNotInsuredDepositoryInstitution contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-560B5C4F762F52885F8DF1B90E8B62B4">An investment in the fund is not a bank deposit, and it is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.</rr:RiskNotInsuredDepositoryInstitution>
  <rr:RiskReturnHeading contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-210BDBD90F21310EB65EF1B90EBAF700">Managed Account Shares Series CA Fund</rr:RiskReturnHeading>
  <rr:RiskReturnHeading contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-640AB2F7224E713D6174F1B90DA1B518">Managed Account Shares Series N Fund</rr:RiskReturnHeading>
  <rr:StrategyHeading contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-4C924697C099AFE5A0CE322DD0419327">Principal Investment Strategies</rr:StrategyHeading>
  <rr:StrategyHeading contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-CEB4932F62AC3549DBD0F1B90E8B1517">Principal Investment Strategies</rr:StrategyHeading>
  <rr:StrategyNarrativeTextBlock contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-B9D428699542F03FE0AB322E142B1C19">&lt;div style="font-family:Times New Roman;font-size:10pt;"&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;The fund invests in California municipal and other debt securities through a combination of investment-grade and high-yield securities. A high-yield security is one that has been rated below investment-grade, or determined by the investment advisor to be of similar quality. Under normal market conditions, the portfolio managers invest at least 80% of the fund&amp;#8217;s net assets in municipal securities with income payments exempt from federal and California income taxes. &lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;Cities, counties and other municipalities in California and U.S. territories usually issue these securities for public projects, such as schools, roads, and water and sewer systems. Some of these investments are not necessarily exempt from the federal alternative minimum tax.&amp;#160;&lt;/font&gt;&lt;/div&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;The portfolio managers &lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;may&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt; seek to invest in securities that will result in a high yield for the fund. To accomplish this, the portfolio managers &lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;may&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt; buy securities that are rated below investment-grade, including so-called junk bonds and bonds that are in technical or monetary default. Issuers of these securities often have short financial histories or have questionable credit or have had and may continue to have problems making interest and principal payments.&amp;#160;&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;The fund typically invests in intermediate-term and long-term bonds.&lt;/font&gt;&lt;/div&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;The portfolio managers also may buy unrated securities if they determine such securities meet the investment objectives of the fund.&amp;#160;&lt;/font&gt;&lt;/div&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;Although the fund invests primarily for income, it also employs techniques designed to realize capital appreciation. For example, the portfolio managers may select bonds with maturities and coupon rates that position the fund for potential capital appreciation for a variety of reasons, including their view on the direction of future interest-rate movements and the potential for a credit upgrade.&lt;/font&gt;&lt;/div&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;When determining whether to sell a security, the portfolio managers consider, among other things, current and anticipated changes in interest rates, the credit quality of a particular issuer, comparable alternatives, general market conditions and any other factor deemed relevant by the portfolio managers.&amp;#160;&lt;/font&gt;&lt;/div&gt;&lt;/div&gt;</rr:StrategyNarrativeTextBlock>
  <rr:StrategyNarrativeTextBlock contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-AAC930E9EA5C9BA6CC93F1B90E8B2BFE">&lt;div style="font-family:Times New Roman;font-size:10pt;"&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;The fund invests in municipal and other debt securities through a combination of investment-grade and high-yield securities. A high-yield security is one that has been rated below investment-grade, or determined by the investment advisor to be of similar quality.&lt;/font&gt;&lt;/div&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;Under normal market conditions, the portfolio managers invest at least 80% of the fund&amp;#8217;s net assets in municipal securities with interest payments exempt from federal income tax. &lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;Cities, counties and other municipalities in the 50 states and U.S. territories usually issue these securities for public projects, such as schools, roads and water and sewer systems. Some of these investments are not necessarily exempt from the federal alternative minimum tax.&lt;/font&gt;&lt;/div&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;The portfolio managers &lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;may&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt; seek to invest in securities that will result in a high yield for the fund. To accomplish this, the portfolio managers &lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;may&lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt; buy securities that are rated below investment-grade, including so-called junk bonds and bonds that are in technical or monetary default. Issuers of these securities often have short financial histories or have questionable credit or have had and may continue to have problems making interest and principal payments. &lt;/font&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;The fund typically invests in intermediate-term and long-term bonds.&lt;/font&gt;&lt;/div&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;The portfolio managers also may buy unrated securities if they determine such securities meet the investment objectives of the fund.&lt;/font&gt;&lt;/div&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;The managers typically buy long-term and intermediate-term municipal securities, but may purchase municipal securities of any duration.&lt;/font&gt;&lt;/div&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;Although the fund invests principally for income, it also employs techniques designed to realize capital appreciation. For example, the portfolio managers may select bonds with maturities and coupon rates that position the fund for potential capital appreciation for a variety of reasons, including their view on the direction of future interest-rate movements and the potential for a credit upgrade.&lt;/font&gt;&lt;/div&gt;&lt;div style="line-height:120%;padding-bottom:4px;padding-top:4px;text-align:left;font-size:10pt;"&gt;&lt;font style="font-family:inherit;font-size:10pt;"&gt;When determining whether to sell a security, portfolio managers consider, among other things, current and anticipated changes in interest rates, the credit quality of a particular issuer, comparable alternatives, general market conditions and any other factor deemed relevant by the portfolio managers.&lt;/font&gt;&lt;/div&gt;&lt;/div&gt;</rr:StrategyNarrativeTextBlock>
  <rr:StrategyPortfolioConcentration contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068226Member" id="Fact-C300AAC878DC4239BE9065CC41ACDAEC">Under normal market conditions, the portfolio managers invest at least 80% of the fund&#8217;s net assets in municipal securities with income payments exempt from federal and California income taxes. Cities, counties and other municipalities in California and U.S. territories usually issue these securities for public projects, such as schools, roads, and water and sewer systems.</rr:StrategyPortfolioConcentration>
  <rr:StrategyPortfolioConcentration contextRef="D2020Q2APR02-APR02_dei_DocumentInformationDocumentAxis_ck0000746458_AMERICANCENTURYMUNICIPALTRUSTMember_dei_LegalEntityAxis_ck0000746458_S000068227Member" id="Fact-694A0B783B80E0D0197B65CB9FD7C4F4">Under normal market conditions, the portfolio managers invest at least 80% of the fund&#8217;s net assets in municipal securities with interest payments exempt from federal income tax. Cities, counties and other municipalities in the 50 states and U.S. territories usually issue these securities for public projects, such as schools, roads and water and sewer systems.</rr:StrategyPortfolioConcentration>
  <link:footnoteLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <link:loc xlink:href="#Fact-4E0CF4C37F807546E2B67F88D9100AFB" xlink:label="Fact-4E0CF4C37F807546E2B67F88D9100AFB_lbl" xlink:type="locator" />
    <link:loc xlink:href="#Fact-DC74940F1AFB9365CD407F8C88B892F7" xlink:label="Fact-DC74940F1AFB9365CD407F8C88B892F7_lbl" xlink:type="locator" />
    <link:footnoteArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Fact-4E0CF4C37F807546E2B67F88D9100AFB_lbl" xlink:to="Footnote-A94C96C5CDC302857A71F1B90E6C3CAF_lbl" xlink:type="arc" />
    <link:footnoteArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Fact-4E0CF4C37F807546E2B67F88D9100AFB_lbl" xlink:to="Footnote-F368337D517FC75E7104328E13E63833_lbl" xlink:type="arc" />
    <link:footnoteArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Fact-DC74940F1AFB9365CD407F8C88B892F7_lbl" xlink:to="Footnote-3F46FE6100B7CCB023BF322823C275EF_lbl" xlink:type="arc" />
    <link:footnoteArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Fact-DC74940F1AFB9365CD407F8C88B892F7_lbl" xlink:to="Footnote-78B34FC1190268B79AD03227D0556E4C_lbl" xlink:type="arc" />
    <link:footnote xlink:label="Footnote-3F46FE6100B7CCB023BF322823C275EF_lbl" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US">Pursuant to the investment advisory agreement between the fund and the advisor, the advisor will pay all of the expenses of the fund other than brokerage and other transaction fees and expenses relating to the acquisition and disposition of portfolio securities, acquired fund fees and expenses, interest (including without limitation borrowing costs and overdraft charges), taxes (including without limitation income, excise, transfer, and withholding taxes), litigation expenses (including without limitation litigation counsel fees and expenses), and extraordinary expenses.</link:footnote>
    <link:footnote xlink:label="Footnote-78B34FC1190268B79AD03227D0556E4C_lbl" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US">Other expenses are based on estimated amounts for the current fiscal year.</link:footnote>
    <link:footnote xlink:label="Footnote-A94C96C5CDC302857A71F1B90E6C3CAF_lbl" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US">Other expenses are based on estimated amounts for the current fiscal year.</link:footnote>
    <link:footnote xlink:label="Footnote-F368337D517FC75E7104328E13E63833_lbl" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US">Pursuant to the investment advisory agreement between the fund and the advisor, the advisor will pay all of the expenses of the fund other than brokerage and other transaction fees and expenses relating to the acquisition and disposition of portfolio securities, acquired fund fees and expenses, interest (including without limitation borrowing costs and overdraft charges), taxes (including without limitation income, excise, transfer, and withholding taxes), litigation expenses (including without limitation litigation counsel fees and expenses), and extraordinary expenses.</link:footnote>
  </link:footnoteLink>
</xbrli:xbrl>
