Fees and Expenses - Investment Trust Prospectus |
Aug. 01, 2026
USD ($)
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|---|---|
| CORE PLUS FUND | |
| Prospectus [Line Items] | |
| Expense Heading [Optional Text] | Fees and Expenses |
| Expense Narrative [Text Block] | 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. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Century Investments funds. More information about these and other discounts is available from your financial professional and in Calculation of Sales Charges on page 16 of the fund’s prospectus, Appendix A of the fund’s prospectus and Sales Charges in Appendix B of the statement of additional information.
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| Expense Breakpoint Discounts [Text] | You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Century Investments funds. |
| Expense Breakpoint, Minimum Investment Required [Amount] | $ 100,000 |
| Shareholder Fees Caption [Optional Text] | Shareholder Fees (fees paid directly from your investment) |
| Operating Expenses Caption [Optional Text] | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) |
| Expense Example [Heading] | Example |
| Expense Example Narrative [Text Block] | The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other mutual funds. |
| Expense Example by, Year, Caption [Text] | 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 and that you earn a 5% return each year. The example also assumes that the fund’s operating expenses remain the same, except that it reflects the rate and duration of any fee waivers noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be: |
| Portfolio Turnover [Heading] | Portfolio Turnover |
| Portfolio Turnover [Text Block] | The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” 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’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 171% of the average value of its portfolio.
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| Portfolio Turnover, Rate | 171.00% |
| CORE PLUS FUND | CORE PLUS FUND, A CLASS | |
| Prospectus [Line Items] | |
| Expenses Deferred Charges [Text Block] | Purchases of $1 million or more may be subject to a contingent deferred sales charge of 1.00% if the shares are redeemed within one year of the date of the purchase. |
| DIVERSIFIED BOND FUND | |
| Prospectus [Line Items] | |
| Expense Heading [Optional Text] | Fees and Expenses |
| Expense Narrative [Text Block] | 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. You may qualify for A Class sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Century Investments funds. More information about these and other discounts is available from your financial professional and in Calculation of Sales Charges on page 16 of the fund’s prospectus, Appendix A of the fund’s prospectus and Sales Charges in Appendix B of the statement of additional information.
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| Shareholder Fees Caption [Optional Text] | Shareholder Fees (fees paid directly from your investment) |
| Operating Expenses Caption [Optional Text] | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) |
| Expense Example [Heading] | Example |
| Expense Example Narrative [Text Block] | The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other mutual funds. |
| Expense Example by, Year, Caption [Text] | 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 and that you earn a 5% return each year. The example also assumes that the fund’s operating expenses remain the same, except that it reflects the rate and duration of any fee waivers noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be: |
| Portfolio Turnover [Heading] | Portfolio Turnover |
| Portfolio Turnover [Text Block] | The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” 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’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 161% of the average value of its portfolio.
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| Portfolio Turnover, Rate | 161.00% |
| DIVERSIFIED BOND FUND | DIVERSIFIED BOND FUND, A CLASS | |
| Prospectus [Line Items] | |
| Expense Breakpoint Discounts [Text] | You may qualify for A Class sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Century Investments funds. |
| Expenses Deferred Charges [Text Block] | Purchases of $1 million or more may be subject to a contingent deferred sales charge of 1.00% if the shares are redeemed within one year of the date of the purchase. |
| HIGH INCOME FUND | |
| Prospectus [Line Items] | |
| Expense Heading [Optional Text] | Fees and Expenses |
| Expense Narrative [Text Block] | 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. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Century Investments funds. More information about these and other discounts is available from your financial professional and in Calculation of Sales Charges on page 14 of the fund’s prospectus, Appendix A of the fund’s prospectus and Sales Charges in Appendix B of the statement of additional information.
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| Expense Breakpoint Discounts [Text] | You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Century Investments funds. |
| Expense Breakpoint, Minimum Investment Required [Amount] | $ 100,000 |
| Shareholder Fees Caption [Optional Text] | Shareholder Fees (fees paid directly from your investment) |
| Operating Expenses Caption [Optional Text] | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) |
| Expense Example [Heading] | Example |
| Expense Example Narrative [Text Block] | The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other mutual funds. |
| Expense Example by, Year, Caption [Text] | 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 and that you earn a 5% return each year. The example also assumes that the fund’s operating expenses remain the same, except that it reflects the rate and duration of any fee waivers noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be: |
| Portfolio Turnover [Heading] | Portfolio Turnover |
| Portfolio Turnover [Text Block] | The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” 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’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 42% of the average value of its portfolio.
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| Portfolio Turnover, Rate | 42.00% |
| HIGH INCOME FUND | HIGH INCOME FUND A CLASS | |
| Prospectus [Line Items] | |
| Expenses Deferred Charges [Text Block] | Purchases of $1 million or more may be subject to a contingent deferred sales charge of 1.00% if the shares are redeemed within one year of the date of the purchase. |
| HIGH-YIELD FUND | |
| Prospectus [Line Items] | |
| Expense Heading [Optional Text] | Fees and Expenses |
| Expense Narrative [Text Block] | 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. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Century Investments funds. More information about these and other discounts is available from your financial professional and in Calculation of Sales Charges on page 15 of the fund’s prospectus, Appendix A of the fund’s prospectus and Sales Charges in Appendix B of the statement of additional information. |
| Expense Breakpoint Discounts [Text] | You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Century Investments funds. |
| Expenses Restated to Reflect Current [Text] | The management fee has been restated to reflect the decrease in the management fee schedule effective June 24, 2025. |
| Expense Breakpoint, Minimum Investment Required [Amount] | $ 100,000 |
| Shareholder Fees Caption [Optional Text] | Shareholder Fees (fees paid directly from your investment) |
| Operating Expenses Caption [Optional Text] | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) |
| Expense Example [Heading] | Example |
| Expense Example Narrative [Text Block] | The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other mutual funds. |
| Expense Example by, Year, Caption [Text] | 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 (unless otherwise indicated), that you earn a 5% return each year, and that the fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: |
| Portfolio Turnover [Heading] | Portfolio Turnover |
| Portfolio Turnover [Text Block] | The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” 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’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 116% of the average value of its portfolio. The increase in portfolio turnover during the period was due to portfolio repositioning associated with changes in the fund's investment strategy.
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| Portfolio Turnover, Rate | 116.00% |
| HIGH-YIELD FUND | HIGH-YIELD FUND, A CLASS | |
| Prospectus [Line Items] | |
| Expenses Deferred Charges [Text Block] | Purchases of $1 million or more may be subject to a contingent deferred sales charge of 1.00% if the shares are redeemed within one year of the date of the purchase. |
| MULTISECTOR INCOME FUND | |
| Prospectus [Line Items] | |
| Expense Heading [Optional Text] | Fees and Expenses |
| Expense Narrative [Text Block] | 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. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Century Investments funds. More information about these and other discounts is available from your financial professional and in Calculation of Sales Charges on page 17 of the fund’s prospectus, Appendix A of the fund’s prospectus and Sales Charges in Appendix B of the statement of additional information.
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| Expense Breakpoint Discounts [Text] | You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Century Investments funds. |
| Shareholder Fees Caption [Optional Text] | Shareholder Fees (fees paid directly from your investment) |
| Operating Expenses Caption [Optional Text] | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) |
| Expense Example [Heading] | Example |
| Expense Example Narrative [Text Block] | The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other mutual funds. |
| Expense Example by, Year, Caption [Text] | 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 and that you earn a 5% return each year. The example also assumes that the fund’s operating expenses remain the same, except that it reflects the rate and duration of any fee waivers noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be: |
| Portfolio Turnover [Heading] | Portfolio Turnover |
| Portfolio Turnover [Text Block] | The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” 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’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 162% of the average value of its portfolio.
|
| Portfolio Turnover, Rate | 162.00% |
| MULTISECTOR INCOME FUND | MULTISECTOR INCOME FUND, A CLASS | |
| Prospectus [Line Items] | |
| Expenses Deferred Charges [Text Block] | Purchases of $1 million or more may be subject to a contingent deferred sales charge of 1.00% if the shares are redeemed within one year of the date of the purchase. |
| PRIME MONEY MARKET FUND | |
| Prospectus [Line Items] | |
| Expense Heading [Optional Text] | Fees and Expenses |
| Expense Narrative [Text Block] | 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. More information about sales charges that may apply in certain circumstances where such shares were acquired by exchange from another American Century Investments fund, is available from your financial professional and in Calculation of Sales Charges on page 11 of the fund’s prospectus, Appendix A of the fund’s prospectus and Sales Charges in Appendix B of the statement of additional information.
|
| Shareholder Fees Caption [Optional Text] | Shareholder Fees (fees paid directly from your investment) |
| Operating Expenses Caption [Optional Text] | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) |
| Expense Example [Heading] | Example |
| Expense Example Narrative [Text Block] | The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other mutual funds. |
| Expense Example by, Year, Caption [Text] | 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 (unless otherwise indicated), that you earn a 5% return each year, and that the fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: |
| PRIME MONEY MARKET FUND | PRIME MONEY MARKET FUND, A CLASS | |
| Prospectus [Line Items] | |
| Expenses Deferred Charges [Text Block] | Purchases in these shares may be subject to a contingent deferred sales charge (CDSC) of 1.00% for A and C Class in certain circumstances where such shares were acquired by exchange from another American Century Investments fund. |
| PRIME MONEY MARKET FUND | PRIME MONEY MARKET FUND, C CLASS | |
| Prospectus [Line Items] | |
| Expenses Deferred Charges [Text Block] | Purchases in these shares may be subject to a contingent deferred sales charge (CDSC) of 1.00% for A and C Class in certain circumstances where such shares were acquired by exchange from another American Century Investments fund. |
| SHORT DURATION FUND | |
| Prospectus [Line Items] | |
| Expense Heading [Optional Text] | Fees and Expenses |
| Expense Narrative [Text Block] | 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. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Century Investments funds. More information about these and other discounts is available from your financial professional and in Calculation of Sales Charges on page 17 of the fund’s prospectus, Appendix A of the fund’s prospectus and Sales Charges in Appendix B of the statement of additional information.
|
| Expense Breakpoint Discounts [Text] | You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Century Investments funds. |
| Expense Breakpoint, Minimum Investment Required [Amount] | $ 100,000 |
| Shareholder Fees Caption [Optional Text] | Shareholder Fees (fees paid directly from your investment) |
| Operating Expenses Caption [Optional Text] | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) |
| Expense Example [Heading] | Example |
| Expense Example Narrative [Text Block] | The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other mutual funds. |
| Expense Example by, Year, Caption [Text] | 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 and that you earn a 5% return each year. The example also assumes that the fund’s operating expenses remain the same, except that it reflects the rate and duration of any fee waivers noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be: |
| Portfolio Turnover [Heading] | Portfolio Turnover |
| Portfolio Turnover [Text Block] | The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” 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’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 197% of the average value of its portfolio. |
| Portfolio Turnover, Rate | 197.00% |
| SHORT DURATION FUND | SHORT DURATION FUND, A CLASS | |
| Prospectus [Line Items] | |
| Expenses Deferred Charges [Text Block] | Purchases of $500,000 or more may be subject to a contingent deferred sales charge of 1.00% if the shares are redeemed within one year of the date of the purchase. |
| SHORT DURATION INFLATION PROTECTION BOND FUND | |
| Prospectus [Line Items] | |
| Expense Heading [Optional Text] | Fees and Expenses |
| Expense Narrative [Text Block] | 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. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Century Investments funds. More information about these and other discounts is available from your financial professional and in Calculation of Sales Charges on page 16 of the fund’s prospectus, Appendix A of the fund’s prospectus and Sales Charges in Appendix B of the statement of additional information.
|
| Expense Breakpoint Discounts [Text] | You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Century Investments funds. |
| Expense Breakpoint, Minimum Investment Required [Amount] | $ 100,000 |
| Shareholder Fees Caption [Optional Text] | Shareholder Fees (fees paid directly from your investment) |
| Operating Expenses Caption [Optional Text] | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) |
| Expense Example [Heading] | Example |
| Expense Example Narrative [Text Block] | The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other mutual funds. |
| Expense Example by, Year, Caption [Text] | 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 (unless otherwise indicated), that you earn a 5% return each year. The example also assumes that the fund’s operating expenses remain the same, except that it reflects the rate and duration of any fee waivers noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be: |
| Portfolio Turnover [Heading] | Portfolio Turnover |
| Portfolio Turnover [Text Block] | The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” 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’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 59% of the average value of its portfolio.
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| Portfolio Turnover, Rate | 59.00% |
| SHORT DURATION INFLATION PROTECTION BOND FUND | SHORT DURATION INFLATION PROTECTION BOND FUND, A CLASS | |
| Prospectus [Line Items] | |
| Expenses Deferred Charges [Text Block] | Purchases of $500,000 or more may be subject to a contingent deferred sales charge of 1.00% if the shares are redeemed within one year of the date of the purchase. |
| SHORT DURATION STRATEGIC INCOME FUND | |
| Prospectus [Line Items] | |
| Expense Heading [Optional Text] | Fees and Expenses |
| Expense Narrative [Text Block] | 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. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Century Investments funds. More information about these and other discounts is available from your financial professional and in Calculation of Sales Charges on page 17 of the fund’s prospectus, Appendix A of the fund’s prospectus and Sales Charges in Appendix B of the statement of additional information.
|
| Expense Breakpoint Discounts [Text] | You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in American Century Investments funds. |
| Expense Breakpoint, Minimum Investment Required [Amount] | $ 100,000 |
| Shareholder Fees Caption [Optional Text] | Shareholder Fees (fees paid directly from your investment) |
| Operating Expenses Caption [Optional Text] | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) |
| Expense Example [Heading] | Example |
| Expense Example Narrative [Text Block] | The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other mutual funds. |
| Expense Example by, Year, Caption [Text] | 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’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: |
| Portfolio Turnover [Heading] | Portfolio Turnover |
| Portfolio Turnover [Text Block] | The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” 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’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 156% of the average value of its portfolio.
|
| Portfolio Turnover, Rate | 156.00% |
| SHORT DURATION STRATEGIC INCOME FUND | SHORT DURATION STRATEGIC INCOME FUND, A CLASS | |
| Prospectus [Line Items] | |
| Expenses Deferred Charges [Text Block] | Purchases of $500,000 or more may be subject to a contingent deferred sales charge of 1.00% if the shares are redeemed within one year of the date of the purchase. |
| U.S. GOVERNMENT MONEY MARKET FUND | |
| Prospectus [Line Items] | |
| Expense Heading [Optional Text] | Fees and Expenses |
| Expense Narrative [Text Block] | 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. More information about sales charges that may apply in certain circumstances where such shares were acquired by exchange from another American Century Investments fund, is available from your financial professional and in Calculation of Sales Charges on page 12 of the fund’s prospectus, Appendix A of the fund’s prospectus and Sales Charges in Appendix B of the statement of additional information.
|
| Shareholder Fees Caption [Optional Text] | Shareholder Fees (fees paid directly from your investment) |
| Operating Expenses Caption [Optional Text] | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) |
| Expense Example [Heading] | Example |
| Expense Example Narrative [Text Block] | The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other mutual funds. |
| Expense Example by, Year, Caption [Text] | 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. The example also assumes that the fund’s operating expenses remain the same, except that it reflects the rate and duration of any fee waivers noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be: |
| U.S. GOVERNMENT MONEY MARKET FUND | U.S. GOVERNMENT MONEY MARKET FUND, A CLASS | |
| Prospectus [Line Items] | |
| Expenses Deferred Charges [Text Block] | Purchases in these shares may be subject to a contingent deferred sales charge (CDSC) of 1.00% for A and C Class in certain circumstances where such shares were acquired by exchange from another American Century Investments fund. |
| U.S. GOVERNMENT MONEY MARKET FUND | U.S. GOVERNMENT MONEY MARKET FUND, C CLASS | |
| Prospectus [Line Items] | |
| Expenses Deferred Charges [Text Block] | Purchases in these shares may be subject to a contingent deferred sales charge (CDSC) of 1.00% for A and C Class in certain circumstances where such shares were acquired by exchange from another American Century Investments fund. |