| Label |
Element |
Value |
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Document Type |
dei_DocumentType |
485BPOS |
|
| Document Period End Date |
dei_DocumentPeriodEndDate |
Mar. 31,
2013 |
|
| Registrant Name |
dei_EntityRegistrantName |
AMERICAN CENTURY INVESTMENT TRUST |
|
| Central Index Key |
dei_EntityCentralIndexKey |
0000908406 |
|
| Amendment Flag |
dei_AmendmentFlag |
false |
|
| Trading Symbol |
dei_TradingSymbol |
ACIT |
|
| Document Creation Date |
dei_DocumentCreationDate |
Jul. 25,
2013 |
|
| Document Effective Date |
dei_DocumentEffectiveDate |
Jul. 26,
2013 |
|
| Prospectus Date |
rr_ProspectusDate |
Jul. 26,
2013 |
|
|
CORE PLUS FUND
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Risk/Return [Heading] |
rr_RiskReturnHeading |
CORE PLUS FUND |
|
| Objective [Heading] |
rr_ObjectiveHeading |
Investment Objective |
|
| Objective, Primary [Text Block] |
rr_ObjectivePrimaryTextBlock |
The
fund seeks to maximize total return. |
|
| Objective, Secondary [Text Block] |
rr_ObjectiveSecondaryTextBlock |
As a secondary objective, the fund seeks a high level of income. |
|
| Expense [Heading] |
rr_ExpenseHeading |
Fees and Expenses |
|
| Expense Narrative [Text Block] |
rr_ExpenseNarrativeTextBlock |
The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. 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, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information. |
|
| Shareholder Fees Caption [Text] |
rr_ShareholderFeesCaption |
Shareholder Fees (fees paid directly from your investment) |
|
| Operating Expenses Caption [Text] |
rr_OperatingExpensesCaption |
Annual
Fund Operating Expenses (expenses
that you pay each year as a percentage of the value of your investment) |
|
| Portfolio Turnover [Heading] |
rr_PortfolioTurnoverHeading |
Portfolio Turnover |
|
| Portfolio Turnover [Text Block] |
rr_PortfolioTurnoverTextBlock |
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 137% of the average value of its portfolio. |
|
| Portfolio Turnover, Rate |
rr_PortfolioTurnoverRate |
137.00% |
|
| Expense Breakpoint Discounts [Text] |
rr_ExpenseBreakpointDiscounts |
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, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information. |
|
| Expense Breakpoint, Minimum Investment Required [Amount] |
rr_ExpenseBreakpointMinimumInvestmentRequiredAmount |
$ 100,000 |
|
| Expense Example [Heading] |
rr_ExpenseExampleHeading |
Example |
|
| Expense Example Narrative [Text Block] |
rr_ExpenseExampleNarrativeTextBlock |
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] |
rr_ExpenseExampleByYearCaption |
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: |
|
| Strategy [Heading] |
rr_StrategyHeading |
Principal Investment Strategies |
|
| Strategy Narrative [Text Block] |
rr_StrategyNarrativeTextBlock |
The fund invests at least 65% of its assets in investment-grade, non-money market debt securities. An investment-grade security is one that has been rated by a nationally recognized statistical rating organization in its top four credit quality categories or determined by the advisor to be of comparable credit quality. Debt securities include fixed-income investments such as notes, bonds, commercial paper and U.S. Treasury securities. These securities, which may be payable in U.S. or foreign currencies, may include corporate bonds and notes, government securities and securities backed by mortgages or other assets.
To round out the portfolio, the fund may invest up to 35% of its assets in high-yield and/or emerging markets debt securities. A high-yield security is one that has been rated below the four highest categories used by a nationally recognized statistical rating organization, or determined by the investment advisor to be of similar quality. The fund considers a security to be an emerging markets security if its issuer is located outside the following list of developed countries: Australia, Austria, Belgium, Bermuda, Canada, Denmark, Finland, France, Germany, Greece, Hong Kong, Ireland, Israel, Italy, Japan, Luxembourg, the Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland, the United Kingdom and the United States.
No more than 10% of the fund's assets may be invested in non-dollar denominated debt securities. The weighted average maturity of the fund's portfolio must be 3½ years or longer.
The fund may invest in securities issued or guaranteed by the U.S. Treasury and certain U.S. government agencies or instrumentalities such as the Government National Mortgage Association (Ginnie Mae). Ginnie Mae is supported by the full faith and credit of the U.S. government. Securities issued or guaranteed by other U.S. government agencies or instrumentalities, such as the Federal National Mortgage Association (Fannie Mae), the Federal Home Loan Mortgage Corporation (Freddie Mac), and the Federal Home Loan Bank (FHLB) are not guaranteed by the U.S. Treasury or supported by the full faith and credit of the U.S. government. However, they are authorized to borrow from the U.S. Treasury to meet their obligations.
The fund also may invest in derivative instruments such as options, futures contracts, options on futures contracts, and swap agreements (including, but not limited to, credit default swap agreements), or in mortgage- or asset-backed securities, provided that such investments are in keeping with the fund's investment objectives.
To determine whether to buy or sell a security, the portfolio managers consider, among other things, various fund requirements and standards, along with economic conditions, alternative investments and interest rates. |
|
| Risk [Heading] |
rr_RiskHeading |
Principal Risks |
|
| Risk Narrative [Text Block] |
rr_RiskNarrativeTextBlock |
|
• |
Interest Rate Risk - Investments in debt securities are sensitive to interest rate changes. Generally, the value of debt securities and the funds that hold them decline as interest rates rise. The fund's investments are designed to reduce this risk. Interest rate risk, however, is generally higher for Core Plus than for funds that have a shorter-weighted average maturity, such as money market funds and short-term bond funds. |
|
• |
Credit Risk - 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's share price could also decrease. Changes in the credit rating of a debt security held by the fund could have a similar effect. |
|
• |
Liquidity Risk - 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's price. |
|
• |
Prepayment Risk - The fund may invest in debt securities backed by mortgages or other assets. If these underlying assets are prepaid, the fund may benefit less from declining interest rates than funds of similar maturity that invest less heavily in mortgage- and asset-backed securities. |
|
• |
Foreign Securities Risk - The fund may invest in foreign securities, which are generally riskier than U.S. securities. As a result the fund may be subject to foreign risk, meaning that political events (such as civil unrest, national elections and imposition of exchange controls), social and economic events (such as labor strikes and rising inflation), and natural disasters occurring in a country where the fund invests could cause the fund's investments in that country to experience losses. For these and other reasons, securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. |
|
• |
Currency Risk - Because the fund may invest in securities denominated in foreign currencies, the fund may be subject to currency risk, meaning that the fund could experience gains or losses based solely on changes in the exchange rate between foreign currencies and the U.S. dollar. |
|
• |
Emerging Market Risk - Investing in securities of companies located in emerging market countries generally is also riskier than investing in securities of companies located in foreign developed countries. Emerging market countries may have unstable governments and/or economies that are subject to sudden change. These changes may be magnified by the countries' emergent financial markets, resulting in significant volatility to investments in these countries. These countries also may lack the legal, business and social framework to support securities markets. |
|
• |
Derivative Risk - The use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional instruments. Derivatives are subject to a number of risks, including liquidity, interest rate, market, credit, and correlation risk. |
|
• |
Market Risk - The value of securities owned by the fund may go up and down, sometimes rapidly or unpredictably. |
|
• |
Principal Loss - 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. |
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. |
|
| Risk Lose Money [Text] |
rr_RiskLoseMoney |
|
Principal Loss -
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. |
|
|
| Risk Not Insured Depository Institution [Text] |
rr_RiskNotInsuredDepositoryInstitution |
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. |
|
| Bar Chart and Performance Table [Heading] |
rr_BarChartAndPerformanceTableHeading |
Fund Performance |
|
| Performance Narrative [Text Block] |
rr_PerformanceNarrativeTextBlock |
The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, including yields, please visit americancentury.com.
Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown. |
|
| Performance Information Illustrates Variability of Returns [Text] |
rr_PerformanceInformationIllustratesVariabilityOfReturns |
The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. |
|
| Performance Availability Website Address [Text] |
rr_PerformanceAvailabilityWebSiteAddress |
americancentury.com |
|
| Performance Past Does Not Indicate Future [Text] |
rr_PerformancePastDoesNotIndicateFuture |
The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. |
|
| Bar Chart [Heading] |
rr_BarChartHeading |
Calendar Year Total Returns |
|
| Bar Chart Does Not Reflect Sales Loads [Text] |
rr_BarChartDoesNotReflectSalesLoads |
Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown. |
|
| Bar Chart Closing [Text Block] |
rr_BarChartClosingTextBlock |
Highest Performance
Quarter (3Q 2009): 4.57%
Lowest Performance Quarter
(4Q 2010): -1.42%
As of June 30, 2013, the
most recent calendar quarter end, the fund's Investor Class year-to-date return was -2.89%. |
|
| Year to Date Return, Label |
rr_YearToDateReturnLabel |
Investor Class year-to-date return |
|
| Bar Chart, Year to Date Return, Date |
rr_BarChartYearToDateReturnDate |
Jun. 30,
2013 |
|
| Bar Chart, Year to Date Return |
rr_BarChartYearToDateReturn |
(2.89%) |
|
| Highest Quarterly Return, Label |
rr_HighestQuarterlyReturnLabel |
Highest Performance Quarter |
|
| Highest Quarterly Return, Date |
rr_BarChartHighestQuarterlyReturnDate |
Sep. 30,
2009 |
|
| Highest Quarterly Return |
rr_BarChartHighestQuarterlyReturn |
4.57% |
|
| Lowest Quarterly Return, Label |
rr_LowestQuarterlyReturnLabel |
Lowest Performance Quarter |
|
| Lowest Quarterly Return, Date |
rr_BarChartLowestQuarterlyReturnDate |
Dec. 31,
2010 |
|
| Lowest Quarterly Return |
rr_BarChartLowestQuarterlyReturn |
(1.42%) |
|
| Performance Table Heading |
rr_PerformanceTableHeading |
Average Annual
Total Returns For the calendar year ended December 31, 2012 |
|
| Performance Table Uses Highest Federal Rate |
rr_PerformanceTableUsesHighestFederalRate |
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. |
|
| Performance Table Not Relevant to Tax Deferred |
rr_PerformanceTableNotRelevantToTaxDeferred |
Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs. |
|
| Performance Table One Class of after Tax Shown [Text] |
rr_PerformanceTableOneClassOfAfterTaxShown |
The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary. |
|
| Performance Table Closing [Text Block] |
rr_PerformanceTableClosingTextBlock |
The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs. |
|
|
CORE PLUS FUND | INVESTOR CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
25 |
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.64% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.65% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
67 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
208 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
363 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
811 |
|
| Annual Return 2007 |
rr_AnnualReturn2007 |
7.78% |
|
| Annual Return 2008 |
rr_AnnualReturn2008 |
5.67% |
|
| Annual Return 2009 |
rr_AnnualReturn2009 |
9.54% |
|
| Annual Return 2010 |
rr_AnnualReturn2010 |
6.79% |
|
| Annual Return 2011 |
rr_AnnualReturn2011 |
7.47% |
|
| Annual Return 2012 |
rr_AnnualReturn2012 |
5.75% |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
5.75% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
7.03% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
6.93% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Nov. 30,
2006 |
|
|
CORE PLUS FUND | INSTITUTIONAL CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.44% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.45% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
46 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
145 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
252 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
567 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
5.96% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
7.24% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
7.15% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Nov. 30,
2006 |
|
|
CORE PLUS FUND | A CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
4.50% |
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.64% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
0.25% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.90% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
538 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
725 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
927 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,508 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
0.72% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
5.79% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
5.87% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Nov. 30,
2006 |
|
|
CORE PLUS FUND | C CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
1.00% |
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.64% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
1.00% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
1.65% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
168 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
521 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
898 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,953 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
4.70% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
5.97% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
5.88% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Nov. 30,
2006 |
|
|
CORE PLUS FUND | R CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.64% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
0.50% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
1.15% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
117 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
366 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
634 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,397 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
5.22% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
6.49% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
6.40% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Nov. 30,
2006 |
|
|
CORE PLUS FUND | Return After Taxes on Distributions | INVESTOR CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
4.55% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
5.34% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
5.26% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Nov. 30,
2006 |
|
|
CORE PLUS FUND | Return After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
3.79% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
5.06% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
4.99% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Nov. 30,
2006 |
|
|
CORE PLUS FUND | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
4.21% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
5.95% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
5.93% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Nov. 30,
2006 |
|
|
DIVERSIFIED BOND FUND
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Risk/Return [Heading] |
rr_RiskReturnHeading |
DIVERSIFIED BOND FUND |
|
| Objective [Heading] |
rr_ObjectiveHeading |
Investment Objective |
|
| Objective, Primary [Text Block] |
rr_ObjectivePrimaryTextBlock |
The fund seeks a high level of income by investing in non-money market debt securities. |
|
| Expense [Heading] |
rr_ExpenseHeading |
Fees and Expenses |
|
| Expense Narrative [Text Block] |
rr_ExpenseNarrativeTextBlock |
The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. 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, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information. The fund's B Class shares are not available for purchase, except through exchanges and dividend reinvestments. |
|
| Shareholder Fees Caption [Text] |
rr_ShareholderFeesCaption |
Shareholder Fees (fees paid directly from your investment) |
|
| Operating Expenses Caption [Text] |
rr_OperatingExpensesCaption |
Annual
Fund Operating Expenses (expenses
that you pay each year as a percentage of the value of your investment) |
|
| Portfolio Turnover [Heading] |
rr_PortfolioTurnoverHeading |
Portfolio Turnover |
|
| Portfolio Turnover [Text Block] |
rr_PortfolioTurnoverTextBlock |
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 115% of the average value of its portfolio. |
|
| Portfolio Turnover, Rate |
rr_PortfolioTurnoverRate |
115.00% |
|
| Expense Breakpoint Discounts [Text] |
rr_ExpenseBreakpointDiscounts |
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, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information. |
|
| Expense Breakpoint, Minimum Investment Required [Amount] |
rr_ExpenseBreakpointMinimumInvestmentRequiredAmount |
100,000 |
|
| Expense Example [Heading] |
rr_ExpenseExampleHeading |
Example |
|
| Expense Example Narrative [Text Block] |
rr_ExpenseExampleNarrativeTextBlock |
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] |
rr_ExpenseExampleByYearCaption |
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: |
|
| Strategy [Heading] |
rr_StrategyHeading |
Principal Investment Strategies |
|
| Strategy Narrative [Text Block] |
rr_StrategyNarrativeTextBlock |
Under normal market conditions, the fund invests at least 80% of its assets in high- and medium-grade, non-money market debt securities. These securities, which may be payable in U.S. or foreign currencies, may include corporate bonds and notes, government securities and securities backed by mortgages or other assets. Shorter-term debt securities round out the portfolio.
The fund invests most of its assets in investment-grade securities. An investment-grade security is one that has been rated by an independent rating agency in its top four credit quality categories or determined by the advisor to be of comparable credit quality. However, up to 15% of the fund's assets may be invested in securities rated in the fifth-highest category by an independent rating agency, or determined to be of comparable quality by the advisor. The weighted average maturity of the fund's portfolio must be three and one-half years or longer.
The fund may invest in securities issued or guaranteed by the U.S. Treasury and certain U.S. government agencies or instrumentalities such as the Government National Mortgage Association (Ginnie Mae). Ginnie Mae is supported by the full faith and credit of the U.S. government. Securities issued or guaranteed by other U.S. government agencies or instrumentalities, such as the Federal National Mortgage Association (Fannie Mae), the Federal Home Loan Mortgage Corporation (Freddie Mac), and the Federal Home Loan Bank (FHLB) are not guaranteed by the U.S. Treasury or supported by the full faith and credit of the U.S. government. However, they are authorized to borrow from the U.S. Treasury to meet their obligations.
The fund also may invest in derivative instruments such as options, futures contracts, options on futures contracts, and swap agreements (including, but not limited to, credit default swap agreements), or in mortgage- or asset-backed securities, provided that such investments are in keeping with the fund's investment objective.
To determine whether to buy or sell a security, the portfolio managers consider, among other things, various fund requirements and standards, along with economic conditions, alternative investments and interest rates. |
|
| Risk [Heading] |
rr_RiskHeading |
Principal Risks |
|
| Risk Narrative [Text Block] |
rr_RiskNarrativeTextBlock |
|
• |
Interest Rate Risk - Investments in debt securities are sensitive to interest rate changes. Generally, the value of debt securities and the funds that hold them decline as interest rates rise. The fund's investments are designed to reduce this risk. Interest rate risk, however, is generally higher for Diversified Bond than for funds that have shorter-weighted maturities, such as money market funds and short-term bond funds. |
|
• |
Credit Risk - 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's share price could also decrease. Changes in the credit rating of a debt security held by the fund could have a similar effect. |
|
• |
Prepayment Risk - The fund may invest in debt securities backed by mortgages or other assets. If these underlying assets are prepaid, the fund may benefit less from declining interest rates than funds of similar maturity that invest less heavily in mortgage- and asset-backed securities. |
|
• |
Foreign Securities Risk - Foreign securities have certain unique risks, such as currency risk, social, political and economic risk, and foreign market and trading risk. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. |
|
• |
Derivative Risk - The use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional instruments. Derivatives are subject to a number of risks, including liquidity, interest rate, market, credit and correlation risk. |
|
• |
Liquidity Risk - 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's share price. |
|
• |
Market Risk - The value of securities owned by the fund may go up and down, sometimes rapidly or unpredictably. |
|
• |
Principal Loss - 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. |
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. |
|
| Risk Lose Money [Text] |
rr_RiskLoseMoney |
|
Principal Loss -
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. |
|
|
| Risk Not Insured Depository Institution [Text] |
rr_RiskNotInsuredDepositoryInstitution |
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. |
|
| Bar Chart and Performance Table [Heading] |
rr_BarChartAndPerformanceTableHeading |
Fund Performance |
|
| Performance Narrative [Text Block] |
rr_PerformanceNarrativeTextBlock |
The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Institutional Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, including yields, please visit americancentury.com.
Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown. |
|
| Performance Information Illustrates Variability of Returns [Text] |
rr_PerformanceInformationIllustratesVariabilityOfReturns |
The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Institutional Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. |
|
| Performance Availability Website Address [Text] |
rr_PerformanceAvailabilityWebSiteAddress |
americancentury.com |
|
| Performance Past Does Not Indicate Future [Text] |
rr_PerformancePastDoesNotIndicateFuture |
The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. |
|
| Bar Chart [Heading] |
rr_BarChartHeading |
Calendar Year Total Returns |
|
| Bar Chart Does Not Reflect Sales Loads [Text] |
rr_BarChartDoesNotReflectSalesLoads |
Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown. |
|
| Bar Chart Closing [Text Block] |
rr_BarChartClosingTextBlock |
Highest
Performance Quarter (4Q 2008): 3.87%
Lowest Performance
Quarter (2Q 2004): -2.60%
As of June 30, 2013, the
most recent calendar quarter end, the fund's Institutional Class year-to-date return was -2.78%. |
|
| Year to Date Return, Label |
rr_YearToDateReturnLabel |
Institutional Class year-to-date return |
|
| Bar Chart, Year to Date Return, Date |
rr_BarChartYearToDateReturnDate |
Jun. 30,
2013 |
|
| Bar Chart, Year to Date Return |
rr_BarChartYearToDateReturn |
(2.78%) |
|
| Highest Quarterly Return, Label |
rr_HighestQuarterlyReturnLabel |
Highest Performance Quarter |
|
| Highest Quarterly Return, Date |
rr_BarChartHighestQuarterlyReturnDate |
Dec. 31,
2008 |
|
| Highest Quarterly Return |
rr_BarChartHighestQuarterlyReturn |
3.87% |
|
| Lowest Quarterly Return, Label |
rr_LowestQuarterlyReturnLabel |
Lowest Performance Quarter |
|
| Lowest Quarterly Return, Date |
rr_BarChartLowestQuarterlyReturnDate |
Jun. 30,
2004 |
|
| Lowest Quarterly Return |
rr_BarChartLowestQuarterlyReturn |
(2.60%) |
|
| Performance Table Heading |
rr_PerformanceTableHeading |
Average Annual
Total Returns For the calendar year ended December 31, 2012 |
|
| Performance Table Uses Highest Federal Rate |
rr_PerformanceTableUsesHighestFederalRate |
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. |
|
| Performance Table Not Relevant to Tax Deferred |
rr_PerformanceTableNotRelevantToTaxDeferred |
Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs. |
|
| Performance Table One Class of after Tax Shown [Text] |
rr_PerformanceTableOneClassOfAfterTaxShown |
The after-tax returns are shown only for Institutional Class shares. After-tax returns for other share classes will vary. |
|
| Performance Table Closing [Text Block] |
rr_PerformanceTableClosingTextBlock |
The after-tax returns are shown only for Institutional Class shares. After-tax returns for other share classes will vary. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs. |
|
|
DIVERSIFIED BOND FUND | INVESTOR CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
25 |
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.59% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.60% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
61 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
193 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
335 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
751 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
5.21% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
6.38% |
|
| 10 Years |
rr_AverageAnnualReturnYear10 |
5.25% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Dec.
03,
2001 |
|
|
DIVERSIFIED BOND FUND | INSTITUTIONAL CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
25 |
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.39% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.40% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
41 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
129 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
225 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
506 |
|
| Annual Return 2003 |
rr_AnnualReturn2003 |
4.22% |
|
| Annual Return 2004 |
rr_AnnualReturn2004 |
3.42% |
|
| Annual Return 2005 |
rr_AnnualReturn2005 |
2.50% |
|
| Annual Return 2006 |
rr_AnnualReturn2006 |
4.01% |
|
| Annual Return 2007 |
rr_AnnualReturn2007 |
7.65% |
|
| Annual Return 2008 |
rr_AnnualReturn2008 |
6.23% |
|
| Annual Return 2009 |
rr_AnnualReturn2009 |
7.40% |
|
| Annual Return 2010 |
rr_AnnualReturn2010 |
6.54% |
|
| Annual Return 2011 |
rr_AnnualReturn2011 |
7.42% |
|
| Annual Return 2012 |
rr_AnnualReturn2012 |
5.42% |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
5.42% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
6.59% |
|
| 10 Years |
rr_AverageAnnualReturnYear10 |
5.46% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Apr.
01,
1993 |
|
|
DIVERSIFIED BOND FUND | A CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
4.50% |
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.59% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
0.25% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.85% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
533 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
709 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
901 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,452 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
0.11% |
[1] |
| 5 Years |
rr_AverageAnnualReturnYear05 |
5.15% |
[1] |
| 10 Years |
rr_AverageAnnualReturnYear10 |
4.51% |
[1] |
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Dec.
03,
2001 |
[1] |
|
DIVERSIFIED BOND FUND | B CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
5.00% |
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.59% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
1.00% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
1.60% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
563 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
806 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
972 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,698 |
|
| Expense Example, No Redemption, 1 Year |
rr_ExpenseExampleNoRedemptionYear01 |
163 |
|
| Expense Example, No Redemption, 3 Years |
rr_ExpenseExampleNoRedemptionYear03 |
506 |
|
| Expense Example, No Redemption, 5 Years |
rr_ExpenseExampleNoRedemptionYear05 |
872 |
|
| Expense Example, No Redemption, 10 Years |
rr_ExpenseExampleNoRedemptionYear10 |
1,698 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
0.17% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
5.16% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
4.25% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Jan. 31,
2003 |
|
|
DIVERSIFIED BOND FUND | C CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
1.00% |
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.59% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
1.00% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
1.60% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
163 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
506 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
872 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,899 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
4.07% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
5.33% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
4.27% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Jan. 31,
2003 |
|
|
DIVERSIFIED BOND FUND | R CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.59% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
0.50% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
1.10% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
112 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
350 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
607 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,340 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
4.59% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
5.85% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
5.36% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Jul. 29,
2005 |
|
|
DIVERSIFIED BOND FUND | R6 CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.34% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.35% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
36 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
113 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
197 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
444 |
|
|
DIVERSIFIED BOND FUND | Return After Taxes on Distributions | INSTITUTIONAL CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
4.14% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
4.95% |
|
| 10 Years |
rr_AverageAnnualReturnYear10 |
3.83% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Apr.
01,
1993 |
|
|
DIVERSIFIED BOND FUND | Return After Taxes on Distributions and Sale of Fund Shares | INSTITUTIONAL CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
3.60% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
4.71% |
|
| 10 Years |
rr_AverageAnnualReturnYear10 |
3.73% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Apr.
01,
1993 |
|
|
DIVERSIFIED BOND FUND | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
4.21% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
5.95% |
|
| 10 Years |
rr_AverageAnnualReturnYear10 |
5.18% |
|
|
HIGH-YIELD FUND
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Risk/Return [Heading] |
rr_RiskReturnHeading |
HIGH-YIELD FUND |
|
| Objective [Heading] |
rr_ObjectiveHeading |
Investment Objective |
|
| Objective, Primary [Text Block] |
rr_ObjectivePrimaryTextBlock |
The fund seeks
high current income. |
|
| Objective, Secondary [Text Block] |
rr_ObjectiveSecondaryTextBlock |
As a secondary objective, the fund seeks capital appreciation, but only when consistent with its primary objective of maximizing current income. |
|
| Expense [Heading] |
rr_ExpenseHeading |
Fees and Expenses |
|
| Expense Narrative [Text Block] |
rr_ExpenseNarrativeTextBlock |
The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. 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, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information. |
|
| Shareholder Fees Caption [Text] |
rr_ShareholderFeesCaption |
Shareholder Fees (fees paid directly from your investment) |
|
| Operating Expenses Caption [Text] |
rr_OperatingExpensesCaption |
Annual
Fund Operating Expenses (expenses
that you pay each year as a percentage of the value of your investment) |
|
| Portfolio Turnover [Heading] |
rr_PortfolioTurnoverHeading |
Portfolio Turnover |
|
| Portfolio Turnover [Text Block] |
rr_PortfolioTurnoverTextBlock |
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 28% of the average value of its portfolio. |
|
| Portfolio Turnover, Rate |
rr_PortfolioTurnoverRate |
28.00% |
|
| Expense Breakpoint Discounts [Text] |
rr_ExpenseBreakpointDiscounts |
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, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 13 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information. |
|
| Expense Breakpoint, Minimum Investment Required [Amount] |
rr_ExpenseBreakpointMinimumInvestmentRequiredAmount |
100,000 |
|
| Expense Example [Heading] |
rr_ExpenseExampleHeading |
Example |
|
| Expense Example Narrative [Text Block] |
rr_ExpenseExampleNarrativeTextBlock |
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] |
rr_ExpenseExampleByYearCaption |
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: |
|
| Strategy [Heading] |
rr_StrategyHeading |
Principal Investment Strategies |
|
| Strategy Narrative [Text Block] |
rr_StrategyNarrativeTextBlock |
The fund invests in high-yield corporate bonds and other debt securities with an emphasis on securities that are rated below investment-grade. A high-yield security is one that has been rated below the four highest categories used by a nationally recognized statistical rating organization, or determined by the investment advisor to be of similar quality.
Under normal market conditions, the portfolio managers will maintain at least 80% of the fund's assets in high-yield corporate bonds and other debt instruments (including income-producing convertible and preferred securities, as well as bank loans, loan participations and loan assignments). The remaining assets may be invested in common stocks or other equity-related securities.
Up to 40% of the fund's total assets may be invested in fixed-income obligations of foreign issuers. Under normal market conditions, the fund may invest up to 20% of its assets in short-term money market instruments and U.S. government securities.
The fund has no average maturity limitations, but it typically invests in intermediate-term and long-term debt securities.
The fund also may invest in derivative instruments such as options, futures contracts, options on futures contracts, and swap agreements (including, but not limited to, credit default swap agreements), or in mortgage- or asset-backed securities, provided that such investments are in keeping with the fund's investment objective.
To determine whether to buy or sell a security, the portfolio managers consider, among other things, various fund requirements and standards, along with economic conditions, alternative investments and interest rates. |
|
| Risk [Heading] |
rr_RiskHeading |
Principal Risks |
|
| Risk Narrative [Text Block] |
rr_RiskNarrativeTextBlock |
|
• |
Credit Risk - Debt securities, especially high-yield 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's share price could also decrease. Changes in the credit rating of a debt security held by the fund could have a similar effect. Issuers of high-yield securities are more vulnerable to real or perceived economic changes (such as an economic down turn or a prolonged period of rising interest rates), political changes or adverse developments specific to an issuer. |
|
• |
Liquidity Risk - 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's share price. The market for lower-quality debt securities is generally less liquid than the market for higher-quality securities. |
|
• |
Interest Rate Risk - Investments in debt securities are also sensitive to interest rate changes. 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's interest rate risk is generally higher than for funds with shorter-weighted average maturities, such as money market and short-term bond funds. |
|
• |
Derivative Risk - The use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional instruments. Derivatives are subject to a number of risks, including liquidity, interest rate, market, credit and correlation risk. |
|
• |
Foreign Securities Risk - Foreign securities have certain unique risks, such as currency risk, social, political and economic risk, and foreign market and trading risk. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. |
|
• |
Market Risk - The value of securities owned by the fund may go up and down, sometimes rapidly or unpredictably. |
|
• |
Loan Risk - In addition to the same general risks as debt securities, loans in which the fund invests may be exposed to restrictions on transfer, the inability or unwillingness of assignor(s) on whom the fund relies to demand and receive loan payments, and the risks of being a lender. |
|
• |
Principal Loss - 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. |
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. |
|
| Risk Lose Money [Text] |
rr_RiskLoseMoney |
|
Principal Loss -
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. |
|
|
| Risk Not Insured Depository Institution [Text] |
rr_RiskNotInsuredDepositoryInstitution |
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. |
|
| Bar Chart and Performance Table [Heading] |
rr_BarChartAndPerformanceTableHeading |
Fund Performance |
|
| Performance Narrative [Text Block] |
rr_PerformanceNarrativeTextBlock |
The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, including yields, please visit americancentury.com.
Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown. |
|
| Performance Information Illustrates Variability of Returns [Text] |
rr_PerformanceInformationIllustratesVariabilityOfReturns |
The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. |
|
| Performance Availability Website Address [Text] |
rr_PerformanceAvailabilityWebSiteAddress |
americancentury.com |
|
| Performance Past Does Not Indicate Future [Text] |
rr_PerformancePastDoesNotIndicateFuture |
The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. |
|
| Bar Chart [Heading] |
rr_BarChartHeading |
Calendar Year Total Returns |
|
| Bar Chart Does Not Reflect Sales Loads [Text] |
rr_BarChartDoesNotReflectSalesLoads |
Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown. |
|
| Bar Chart Closing [Text Block] |
rr_BarChartClosingTextBlock |
Highest
Performance Quarter (2Q 2009): 11.64%
Lowest
Performance Quarter (4Q 2008): -12.11%
As
of June 30, 2013, the most recent calendar
quarter end, the fund's Investor Class year-to-date return was 0.95%. |
|
| Year to Date Return, Label |
rr_YearToDateReturnLabel |
Investor Class year-to-date return |
|
| Bar Chart, Year to Date Return, Date |
rr_BarChartYearToDateReturnDate |
Jun. 30,
2013 |
|
| Bar Chart, Year to Date Return |
rr_BarChartYearToDateReturn |
0.95% |
|
| Highest Quarterly Return, Label |
rr_HighestQuarterlyReturnLabel |
Highest Performance Quarter |
|
| Highest Quarterly Return, Date |
rr_BarChartHighestQuarterlyReturnDate |
Jun. 30,
2009 |
|
| Highest Quarterly Return |
rr_BarChartHighestQuarterlyReturn |
11.64% |
|
| Lowest Quarterly Return, Label |
rr_LowestQuarterlyReturnLabel |
Lowest Performance Quarter |
|
| Lowest Quarterly Return, Date |
rr_BarChartLowestQuarterlyReturnDate |
Dec. 31,
2008 |
|
| Lowest Quarterly Return |
rr_BarChartLowestQuarterlyReturn |
(12.11%) |
|
| Performance Table Heading |
rr_PerformanceTableHeading |
Average Annual
Total Returns For the calendar year ended December 31, 2012 |
|
| Performance Table Uses Highest Federal Rate |
rr_PerformanceTableUsesHighestFederalRate |
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. |
|
| Performance Table Not Relevant to Tax Deferred |
rr_PerformanceTableNotRelevantToTaxDeferred |
Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs. |
|
| Performance Table One Class of after Tax Shown [Text] |
rr_PerformanceTableOneClassOfAfterTaxShown |
The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary. |
|
| Performance Table Closing [Text Block] |
rr_PerformanceTableClosingTextBlock |
The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs. |
|
|
HIGH-YIELD FUND | INVESTOR CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
25 |
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.84% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Acquired Fund Fees and Expenses |
rr_AcquiredFundFeesAndExpensesOverAssets |
0.02% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.87% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
89 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
278 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
483 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,073 |
|
| Annual Return 2003 |
rr_AnnualReturn2003 |
20.14% |
|
| Annual Return 2004 |
rr_AnnualReturn2004 |
8.10% |
|
| Annual Return 2005 |
rr_AnnualReturn2005 |
2.44% |
|
| Annual Return 2006 |
rr_AnnualReturn2006 |
8.15% |
|
| Annual Return 2007 |
rr_AnnualReturn2007 |
2.03% |
|
| Annual Return 2008 |
rr_AnnualReturn2008 |
(17.39%) |
|
| Annual Return 2009 |
rr_AnnualReturn2009 |
35.60% |
|
| Annual Return 2010 |
rr_AnnualReturn2010 |
13.41% |
|
| Annual Return 2011 |
rr_AnnualReturn2011 |
3.75% |
|
| Annual Return 2012 |
rr_AnnualReturn2012 |
15.04% |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
15.04% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
8.67% |
|
| 10 Years |
rr_AverageAnnualReturnYear10 |
8.33% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Sep. 30,
1997 |
|
|
HIGH-YIELD FUND | INSTITUTIONAL CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.64% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Acquired Fund Fees and Expenses |
rr_AcquiredFundFeesAndExpensesOverAssets |
0.02% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.67% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
69 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
215 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
374 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
835 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
15.26% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
8.89% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
7.58% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Aug.
02,
2004 |
|
|
HIGH-YIELD FUND | A CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
4.50% |
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.84% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
0.25% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Acquired Fund Fees and Expenses |
rr_AcquiredFundFeesAndExpensesOverAssets |
0.02% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
1.12% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
559 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
791 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
1,040 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,752 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
9.67% |
[1] |
| 5 Years |
rr_AverageAnnualReturnYear05 |
7.41% |
[1] |
| 10 Years |
rr_AverageAnnualReturnYear10 |
7.59% |
[1] |
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Mar.
08,
2002 |
[1] |
|
HIGH-YIELD FUND | C CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
1.00% |
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.84% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
1.00% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Acquired Fund Fees and Expenses |
rr_AcquiredFundFeesAndExpensesOverAssets |
0.02% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
1.87% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
190 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
589 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
1,012 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
2,188 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
13.90% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
7.60% |
|
| 10 Years |
rr_AverageAnnualReturnYear10 |
7.28% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Dec. 10,
2001 |
|
|
HIGH-YIELD FUND | R CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.84% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
0.50% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Acquired Fund Fees and Expenses |
rr_AcquiredFundFeesAndExpensesOverAssets |
0.02% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
1.37% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
140 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
435 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
751 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,645 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
14.47% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
8.14% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
6.72% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Jul. 29,
2005 |
|
|
HIGH-YIELD FUND | R6 CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.59% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Acquired Fund Fees and Expenses |
rr_AcquiredFundFeesAndExpensesOverAssets |
0.02% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.62% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
63 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
199 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
346 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
775 |
|
|
HIGH-YIELD FUND | Return After Taxes on Distributions | INVESTOR CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
12.31% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
5.76% |
|
| 10 Years |
rr_AverageAnnualReturnYear10 |
5.57% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Sep. 30,
1997 |
|
|
HIGH-YIELD FUND | Return After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
9.88% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
5.67% |
|
| 10 Years |
rr_AverageAnnualReturnYear10 |
5.50% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Sep. 30,
1997 |
|
|
HIGH-YIELD FUND | Barclays U.S. High-Yield 2% Issuer Capped Bond Index (reflects no deduction for fees, expenses or taxes)
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
15.78% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
10.45% |
|
| 10 Years |
rr_AverageAnnualReturnYear10 |
10.60% |
|
|
NT DIVERSIFIED BOND FUND
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Risk/Return [Heading] |
rr_RiskReturnHeading |
NT DIVERSIFIED BOND FUND |
|
| Objective [Heading] |
rr_ObjectiveHeading |
Investment Objective |
|
| Objective, Primary [Text Block] |
rr_ObjectivePrimaryTextBlock |
The fund seeks a high level of income by investing in non-money market debt securities. |
|
| Expense [Heading] |
rr_ExpenseHeading |
Fees and Expenses |
|
| Expense Narrative [Text Block] |
rr_ExpenseNarrativeTextBlock |
The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. |
|
| Operating Expenses Caption [Text] |
rr_OperatingExpensesCaption |
Annual
Fund Operating Expenses (expenses
that you pay each year as a percentage of the value of your investment) |
|
| Portfolio Turnover [Heading] |
rr_PortfolioTurnoverHeading |
Portfolio Turnover |
|
| Portfolio Turnover [Text Block] |
rr_PortfolioTurnoverTextBlock |
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 154% of the average value of its portfolio. |
|
| Portfolio Turnover, Rate |
rr_PortfolioTurnoverRate |
154.00% |
|
| Expense Example [Heading] |
rr_ExpenseExampleHeading |
Example |
|
| Expense Example Narrative [Text Block] |
rr_ExpenseExampleNarrativeTextBlock |
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] |
rr_ExpenseExampleByYearCaption |
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: |
|
| Strategy [Heading] |
rr_StrategyHeading |
Principal Investment Strategies |
|
| Strategy Narrative [Text Block] |
rr_StrategyNarrativeTextBlock |
Under normal market conditions, the fund invests at least 80% of its assets in high- and medium-grade, non-money market debt securities. These securities, which may be payable in U.S. or foreign currencies, may include corporate bonds and notes, government securities and securities backed by mortgages or other assets. Shorter-term debt securities round out the portfolio.
The fund invests most of its assets in investment-grade securities. An investment-grade security is one that has been rated by an independent rating agency in its top four credit quality categories or determined by the advisor to be of comparable credit quality. However, up to 15% of the fund's assets may be invested in securities rated in the fifth-highest category by an independent rating agency, or determined to be of comparable quality by the advisor. The weighted average maturity of the fund's portfolio must be three and one-half years or longer.
The fund may invest in securities issued or guaranteed by the U.S. Treasury and certain U.S. government agencies or instrumentalities such as the Government National Mortgage Association (Ginnie Mae). Ginnie Mae is supported by the full faith and credit of the U.S. government. Securities issued or guaranteed by other U.S. government agencies or instrumentalities, such as the Federal National Mortgage Association (Fannie Mae), the Federal Home Loan Mortgage Corporation (Freddie Mac), and the Federal Home Loan Bank (FHLB) are not guaranteed by the U.S. Treasury or supported by the full faith and credit of the U.S. government. However, they are authorized to borrow from the U.S. Treasury to meet their obligations.
The fund also may invest in derivative instruments such as options, futures contracts, options on futures contracts, and swap agreements (including, but not limited to, credit default swap agreements), or in mortgage- or asset-backed securities, provided that such investments are in keeping with the fund's investment objective.
The fund is not permitted to invest in securities issued by companies assigned the Global Industry Classification Standard (GICS) for the tobacco industry.
To determine whether to buy or sell a security, the portfolio managers consider, among other things, various fund requirements and standards, along with economic conditions, alternative investments and interest rates. |
|
| Risk [Heading] |
rr_RiskHeading |
Principal Risks |
|
| Risk Narrative [Text Block] |
rr_RiskNarrativeTextBlock |
|
• |
Interest Rate Risk - Investments in debt securities are sensitive to interest rate changes. Generally, the value of debt securities and the funds that hold them decline as interest rates rise. The fund's investments are designed to reduce this risk. Interest rate risk, however, is generally higher for NT Diversified Bond than for funds that have shorter-weighted maturities, such as money market funds and short-term bond funds. |
|
• |
Credit Risk - 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's share price could also decrease. Changes in the credit rating of a debt security held by the fund could have a similar effect. |
|
• |
Prepayment Risk - The fund may invest in debt securities backed by mortgages or other assets. If these underlying assets are prepaid, the fund may benefit less from declining interest rates than funds of similar maturity that invest less heavily in mortgage- and asset-backed securities. |
|
• |
Tobacco Exclusion - The fund's prohibition on tobacco-related investments may cause it to forego profitable investment opportunities. |
|
• |
Foreign Securities Risk - Foreign securities have certain unique risks, such as currency risk, social, political and economic risk, and foreign market and trading risk. Securities of foreign issuers may be less liquid, more volatile and harder to value than U.S. securities. |
|
• |
Derivatives Risk - The use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional instruments. Derivatives are subject to a number of risks, including liquidity, interest rate, market, credit and correlation risk. |
|
• |
Liquidity Risk - 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's share price. |
|
• |
Market Risk - The value of securities owned by the fund may go up and down, sometimes rapidly or unpredictably. |
|
• |
Principal Loss - 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. |
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. |
|
| Risk Lose Money [Text] |
rr_RiskLoseMoney |
|
Principal Loss -
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. |
|
|
| Risk Not Insured Depository Institution [Text] |
rr_RiskNotInsuredDepositoryInstitution |
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. |
|
| Bar Chart and Performance Table [Heading] |
rr_BarChartAndPerformanceTableHeading |
Fund Performance |
|
| Performance Narrative [Text Block] |
rr_PerformanceNarrativeTextBlock |
The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Institutional Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, including yields, please visit americancentury.com. |
|
| Performance Information Illustrates Variability of Returns [Text] |
rr_PerformanceInformationIllustratesVariabilityOfReturns |
The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Institutional Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. |
|
| Performance Availability Website Address [Text] |
rr_PerformanceAvailabilityWebSiteAddress |
americancentury.com |
|
| Performance Past Does Not Indicate Future [Text] |
rr_PerformancePastDoesNotIndicateFuture |
The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. |
|
| Bar Chart [Heading] |
rr_BarChartHeading |
Calendar Year Total Returns |
|
| Bar Chart Closing [Text Block] |
rr_BarChartClosingTextBlock |
Highest
Performance Quarter (3Q 2009): 3.90%
Lowest
Performance Quarter (4Q 2010): -1.41%
As
of June 30, 2013, the most recent calendar quarter end, the fund's Institutional Class year-to-date return was -2.65%. |
|
| Year to Date Return, Label |
rr_YearToDateReturnLabel |
Institutional Class year-to-date return |
|
| Bar Chart, Year to Date Return, Date |
rr_BarChartYearToDateReturnDate |
Jun. 30,
2013 |
|
| Bar Chart, Year to Date Return |
rr_BarChartYearToDateReturn |
(2.65%) |
|
| Highest Quarterly Return, Label |
rr_HighestQuarterlyReturnLabel |
Highest Performance Quarter |
|
| Highest Quarterly Return, Date |
rr_BarChartHighestQuarterlyReturnDate |
Sep. 30,
2009 |
|
| Highest Quarterly Return |
rr_BarChartHighestQuarterlyReturn |
3.90% |
|
| Lowest Quarterly Return, Label |
rr_LowestQuarterlyReturnLabel |
Lowest Performance Quarter |
|
| Lowest Quarterly Return, Date |
rr_BarChartLowestQuarterlyReturnDate |
Dec. 31,
2010 |
|
| Lowest Quarterly Return |
rr_BarChartLowestQuarterlyReturn |
(1.41%) |
|
| Performance Table Heading |
rr_PerformanceTableHeading |
Average Annual
Total Returns For the calendar year ended December 31, 2012 |
|
| Performance Table Uses Highest Federal Rate |
rr_PerformanceTableUsesHighestFederalRate |
The after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. |
|
| Performance Table Not Relevant to Tax Deferred |
rr_PerformanceTableNotRelevantToTaxDeferred |
Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs. |
|
| Performance Table One Class of after Tax Shown [Text] |
rr_PerformanceTableOneClassOfAfterTaxShown |
The after-tax returns are shown only for Institutional Class shares. After-tax returns for other share classes will vary. |
|
| Performance Table Closing [Text Block] |
rr_PerformanceTableClosingTextBlock |
The after-tax returns are shown only for Institutional Class shares. After tax returns for other share classes will vary. The after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs. |
|
|
NT DIVERSIFIED BOND FUND | INSTITUTIONAL CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.39% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.40% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
41 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
129 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
225 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
506 |
|
| Annual Return 2007 |
rr_AnnualReturn2007 |
7.59% |
|
| Annual Return 2008 |
rr_AnnualReturn2008 |
5.49% |
|
| Annual Return 2009 |
rr_AnnualReturn2009 |
7.44% |
|
| Annual Return 2010 |
rr_AnnualReturn2010 |
6.36% |
|
| Annual Return 2011 |
rr_AnnualReturn2011 |
7.46% |
|
| Annual Return 2012 |
rr_AnnualReturn2012 |
5.42% |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
5.42% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
6.42% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
6.79% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
May 12,
2006 |
|
|
NT DIVERSIFIED BOND FUND | R6 CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.34% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.35% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
36 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
113 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
197 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
444 |
|
|
NT DIVERSIFIED BOND FUND | Return After Taxes on Distributions | INSTITUTIONAL CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
4.16% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
4.71% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
5.00% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
May 12,
2006 |
|
|
NT DIVERSIFIED BOND FUND | Return After Taxes on Distributions and Sale of Fund Shares | INSTITUTIONAL CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
3.62% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
4.52% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
4.79% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
May 12,
2006 |
|
|
NT DIVERSIFIED BOND FUND | Barclays U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
4.21% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
5.95% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
6.29% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Apr. 28,
2006 |
|
|
PREMIUM MONEY MARKET FUND
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Risk/Return [Heading] |
rr_RiskReturnHeading |
PREMIUM MONEY MARKET FUND |
|
| Objective [Heading] |
rr_ObjectiveHeading |
Investment Objective |
|
| Objective, Primary [Text Block] |
rr_ObjectivePrimaryTextBlock |
The fund seeks to earn the highest level of current income while preserving the value of your investment. |
|
| Expense [Heading] |
rr_ExpenseHeading |
Fees and Expenses |
|
| Expense Narrative [Text Block] |
rr_ExpenseNarrativeTextBlock |
The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. |
|
| Shareholder Fees Caption [Text] |
rr_ShareholderFeesCaption |
Shareholder Fees (fees paid directly from your investment) |
|
| Operating Expenses Caption [Text] |
rr_OperatingExpensesCaption |
Annual
Fund Operating Expenses (expenses
that you pay each year as a percentage of the value of your investment) |
|
| Expense Example [Heading] |
rr_ExpenseExampleHeading |
Example |
|
| Expense Example Narrative [Text Block] |
rr_ExpenseExampleNarrativeTextBlock |
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] |
rr_ExpenseExampleByYearCaption |
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: |
|
| Strategy [Heading] |
rr_StrategyHeading |
Principal Investment Strategies |
|
| Strategy Narrative [Text Block] |
rr_StrategyNarrativeTextBlock |
The fund invests most of its assets in high-quality, very short-term debt securities issued by corporations, banks and federal, state and local governments.
Under normal market conditions, 25% or more of the fund's assets are invested in obligations of issuers in the financial services industry. The debt securities in which the fund invests may include municipal securities and variable-rate securities. A municipal security is a taxable or tax-exempt debt obligation issued by or on behalf of a state, its political subdivisions, agencies or instrumentalities, the District of Columbia or a U.S. territory or possession. A variable-rate security is a debt obligation that provides for specified periodic interest rate adjustments based on changes in some index, such as London Interbank Offered Rate (LIBOR).
The fund may invest in securities issued or guaranteed by the U.S. Treasury and certain U.S. government agencies or instrumentalities such as the Government National Mortgage Association (Ginnie Mae). Ginnie Mae is supported by the full faith and credit of the U.S. government. Securities issued or guaranteed by other U.S. government agencies or instrumentalities, such as the Federal National Mortgage Association (Fannie Mae), the Federal Home Loan Mortgage Corporation (Freddie Mac), and the Federal Home Loan Bank (FHLB) are not guaranteed by the U.S. Treasury or supported by the full faith and credit of the U.S. government. However, they are authorized to borrow from the U.S. Treasury to meet their obligations.
To determine whether to buy or sell a security, the portfolio managers consider, among other things, various fund requirements and standards, along with economic conditions, alternative investments and interest rates.
Because high-quality
debt securities are among the safest securities available, the interest they pay is among the lowest for income-paying securities.
Accordingly, the yield on this fund will likely be lower than the yield on funds that invest in longer-term or lower-quality securities. |
|
| Risk [Heading] |
rr_RiskHeading |
Principal Risks |
|
| Risk Narrative [Text Block] |
rr_RiskNarrativeTextBlock |
Even though the fund's investments are designed to minimize credit, interest rate and liquidity risk, the fund is still subject to some degree of 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. Interest rate risk means that the value of debt securities and funds that hold them decline as interest rates rise. Liquidity risk means that 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's share price.
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. Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in it. |
|
| Risk Lose Money [Text] |
rr_RiskLoseMoney |
Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in it. |
|
| Risk Money Market Fund [Text] |
rr_RiskMoneyMarketFund |
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. Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in it. |
|
| Risk Not Insured Depository Institution [Text] |
rr_RiskNotInsuredDepositoryInstitution |
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. |
|
| Bar Chart and Performance Table [Heading] |
rr_BarChartAndPerformanceTableHeading |
Fund Performance |
|
| Performance Narrative [Text Block] |
rr_PerformanceNarrativeTextBlock |
The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The fund's past performance is not necessarily an indication of how the fund will perform in the future. For current performance information, including yields, please visit americancentury.com.
Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown. |
|
| Performance Information Illustrates Variability of Returns [Text] |
rr_PerformanceInformationIllustratesVariabilityOfReturns |
The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. |
|
| Performance Availability Website Address [Text] |
rr_PerformanceAvailabilityWebSiteAddress |
americancentury.com |
|
| Performance Past Does Not Indicate Future [Text] |
rr_PerformancePastDoesNotIndicateFuture |
The fund's past performance is not necessarily an indication of how the fund will perform in the future. |
|
| Bar Chart [Heading] |
rr_BarChartHeading |
Calendar Year Total Returns |
|
| Bar Chart Does Not Reflect Sales Loads [Text] |
rr_BarChartDoesNotReflectSalesLoads |
Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown. |
|
| Bar Chart Closing [Text Block] |
rr_BarChartClosingTextBlock |
Highest Performance
Quarter (3Q 2007): 1.27%
Lowest Performance
Quarter (1Q 2011): 0.00%
As of June
30, 2013, the most recent calendar quarter end, the fund's Investor Class year-to-date return was 0.00%. |
|
| Year to Date Return, Label |
rr_YearToDateReturnLabel |
Investor Class year-to-date return |
|
| Bar Chart, Year to Date Return, Date |
rr_BarChartYearToDateReturnDate |
Jun. 30,
2013 |
|
| Bar Chart, Year to Date Return |
rr_BarChartYearToDateReturn |
0.00% |
|
| Highest Quarterly Return, Label |
rr_HighestQuarterlyReturnLabel |
Highest Performance Quarter |
|
| Highest Quarterly Return, Date |
rr_BarChartHighestQuarterlyReturnDate |
Sep. 30,
2007 |
|
| Highest Quarterly Return |
rr_BarChartHighestQuarterlyReturn |
1.27% |
|
| Lowest Quarterly Return, Label |
rr_LowestQuarterlyReturnLabel |
Lowest Performance Quarter |
|
| Lowest Quarterly Return, Date |
rr_BarChartLowestQuarterlyReturnDate |
Mar. 31,
2011 |
|
| Lowest Quarterly Return |
rr_BarChartLowestQuarterlyReturn |
0.00% |
|
| Performance Table Heading |
rr_PerformanceTableHeading |
Average Annual
Total Returns For the calendar year ended December 31, 2012 |
|
|
PREMIUM MONEY MARKET FUND | INVESTOR CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
25 |
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.45% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.46% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
47 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
148 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
258 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
580 |
|
| Annual Return 2003 |
rr_AnnualReturn2003 |
0.80% |
|
| Annual Return 2004 |
rr_AnnualReturn2004 |
1.00% |
|
| Annual Return 2005 |
rr_AnnualReturn2005 |
2.88% |
|
| Annual Return 2006 |
rr_AnnualReturn2006 |
4.76% |
|
| Annual Return 2007 |
rr_AnnualReturn2007 |
5.04% |
|
| Annual Return 2008 |
rr_AnnualReturn2008 |
2.86% |
|
| Annual Return 2009 |
rr_AnnualReturn2009 |
0.51% |
|
| Annual Return 2010 |
rr_AnnualReturn2010 |
0.01% |
|
| Annual Return 2011 |
rr_AnnualReturn2011 |
0.01% |
|
| Annual Return 2012 |
rr_AnnualReturn2012 |
0.01% |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
0.01% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
0.67% |
|
| 10 Years |
rr_AverageAnnualReturnYear10 |
1.77% |
|
|
PRIME MONEY MARKET FUND
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Risk/Return [Heading] |
rr_RiskReturnHeading |
PRIME MONEY MARKET FUND |
|
| Objective [Heading] |
rr_ObjectiveHeading |
Investment Objective |
|
| Objective, Primary [Text Block] |
rr_ObjectivePrimaryTextBlock |
The fund seeks to earn the highest level of current income while preserving the value of your investment. |
|
| Expense [Heading] |
rr_ExpenseHeading |
Fees and Expenses |
|
| Expense Narrative [Text Block] |
rr_ExpenseNarrativeTextBlock |
The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. 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 and Sales Charges in Appendix B of the statement of additional information. The fund's B Class shares are not available for purchase, except through exchanges and dividend reinvestments. |
|
| Shareholder Fees Caption [Text] |
rr_ShareholderFeesCaption |
Shareholder Fees (fees paid directly from your investment) |
|
| Operating Expenses Caption [Text] |
rr_OperatingExpensesCaption |
Annual
Fund Operating Expenses (expenses
that you pay each year as a percentage of the value of your investment) |
|
| Expense Example [Heading] |
rr_ExpenseExampleHeading |
Example |
|
| Expense Example Narrative [Text Block] |
rr_ExpenseExampleNarrativeTextBlock |
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] |
rr_ExpenseExampleByYearCaption |
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: |
|
| Strategy [Heading] |
rr_StrategyHeading |
Principal Investment Strategies |
|
| Strategy Narrative [Text Block] |
rr_StrategyNarrativeTextBlock |
The fund invests most of its assets in high-quality, very short-term debt securities issued by corporations, banks and federal, state and local governments.
Under normal market conditions, 25% or more of the fund's assets are invested in obligations of issuers in the financial services industry. The debt securities in which the fund invests may include municipal securities and variable-rate securities. A municipal security is a taxable or tax-exempt debt obligation issued by or on behalf of a state, its political subdivisions, agencies or instrumentalities, the District of Columbia or a U.S. territory or possession. A variable-rate security is a debt obligation that provides for specified periodic interest rate adjustments based on changes in some index, such as the London Interbank Offered Rate (LIBOR).
The fund may invest in securities issued or guaranteed by the U.S. Treasury and certain U.S. government agencies or instrumentalities such as the Government National Mortgage Association (Ginnie Mae). Ginnie Mae is supported by the full faith and credit of the U.S. government. Securities issued or guaranteed by other U.S. government agencies or instrumentalities, such as the Federal National Mortgage Association (Fannie Mae), the Federal Home Loan Mortgage Corporation (Freddie Mac), and the Federal Home Loan Bank (FHLB) are not guaranteed by the U.S. Treasury or supported by the full faith and credit of the U.S. government. However, they are authorized to borrow from the U.S. Treasury to meet their obligations.
To determine whether to buy or sell a security, the portfolio managers consider, among other things, various fund requirements and standards, along with economic conditions, alternative investments and interest rates.
Because high-quality debt securities are among the safest securities available, the interest they pay is among the lowest for income-paying securities. Accordingly, the yield on this fund will likely be lower than the yield on funds that invest in longer-term or lower-quality securities. |
|
| Risk [Heading] |
rr_RiskHeading |
Principal Risks |
|
| Risk Narrative [Text Block] |
rr_RiskNarrativeTextBlock |
Even though the fund's investments are designed to minimize credit, interest rate and liquidity risk, the fund is still subject to some degree of 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. Interest rate risk means that the value of debt securities and funds that hold them decline as interest rates rise. Liquidity risk means that 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's share price.
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. Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in it. |
|
| Risk Lose Money [Text] |
rr_RiskLoseMoney |
Although
the fund seeks to preserve the value of your investment at $1.00 per
share, it is possible to lose money by investing in it. |
|
| Risk Money Market Fund [Text] |
rr_RiskMoneyMarketFund |
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. Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in it. |
|
| Risk Not Insured Depository Institution [Text] |
rr_RiskNotInsuredDepositoryInstitution |
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. |
|
| Bar Chart and Performance Table [Heading] |
rr_BarChartAndPerformanceTableHeading |
Fund Performance |
|
| Performance Narrative [Text Block] |
rr_PerformanceNarrativeTextBlock |
The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The fund's past performance is not necessarily an indication of how the fund will perform in the future. For current performance information, including yields, please visit americancentury.com.
Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown. |
|
| Performance Information Illustrates Variability of Returns [Text] |
rr_PerformanceInformationIllustratesVariabilityOfReturns |
The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. |
|
| Performance Availability Website Address [Text] |
rr_PerformanceAvailabilityWebSiteAddress |
americancentury.com |
|
| Performance Past Does Not Indicate Future [Text] |
rr_PerformancePastDoesNotIndicateFuture |
The fund's past performance is not necessarily an indication of how the fund will perform in the future. |
|
| Bar Chart [Heading] |
rr_BarChartHeading |
Calendar Year Total Returns |
|
| Bar Chart Does Not Reflect Sales Loads [Text] |
rr_BarChartDoesNotReflectSalesLoads |
Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown. |
|
| Bar Chart Closing [Text Block] |
rr_BarChartClosingTextBlock |
Highest Performance
Quarter (3Q 2007): 1.23%
Lowest
Performance Quarter (1Q 2010): 0.00%
As
of June 30, 2013, the most recent calendar quarter end, the fund's Investor Class year-to-date return was 0.00%. |
|
| Year to Date Return, Label |
rr_YearToDateReturnLabel |
Investor Class year-to-date return |
|
| Bar Chart, Year to Date Return, Date |
rr_BarChartYearToDateReturnDate |
Jun. 30,
2013 |
|
| Bar Chart, Year to Date Return |
rr_BarChartYearToDateReturn |
0.00% |
|
| Highest Quarterly Return, Label |
rr_HighestQuarterlyReturnLabel |
Highest Performance Quarter |
|
| Highest Quarterly Return, Date |
rr_BarChartHighestQuarterlyReturnDate |
Sep. 30,
2007 |
|
| Highest Quarterly Return |
rr_BarChartHighestQuarterlyReturn |
1.23% |
|
| Lowest Quarterly Return, Label |
rr_LowestQuarterlyReturnLabel |
Lowest Performance Quarter |
|
| Lowest Quarterly Return, Date |
rr_BarChartLowestQuarterlyReturnDate |
Mar. 31,
2010 |
|
| Lowest Quarterly Return |
rr_BarChartLowestQuarterlyReturn |
0.00% |
|
| Performance Table Heading |
rr_PerformanceTableHeading |
Average Annual
Total Returns For the calendar year ended December 31, 2012 |
|
|
PRIME MONEY MARKET FUND | INVESTOR CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
25 |
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.57% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.58% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
59 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
186 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
324 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
726 |
|
| Annual Return 2003 |
rr_AnnualReturn2003 |
0.64% |
|
| Annual Return 2004 |
rr_AnnualReturn2004 |
0.85% |
|
| Annual Return 2005 |
rr_AnnualReturn2005 |
2.75% |
|
| Annual Return 2006 |
rr_AnnualReturn2006 |
4.62% |
|
| Annual Return 2007 |
rr_AnnualReturn2007 |
4.89% |
|
| Annual Return 2008 |
rr_AnnualReturn2008 |
2.81% |
|
| Annual Return 2009 |
rr_AnnualReturn2009 |
0.48% |
|
| Annual Return 2010 |
rr_AnnualReturn2010 |
0.01% |
|
| Annual Return 2011 |
rr_AnnualReturn2011 |
0.01% |
|
| Annual Return 2012 |
rr_AnnualReturn2012 |
0.01% |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
0.01% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
0.66% |
|
| 10 Years |
rr_AverageAnnualReturnYear10 |
1.69% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Nov. 17,
1993 |
|
|
PRIME MONEY MARKET FUND | A CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.57% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
0.25% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.83% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
85 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
265 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
461 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,026 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
0.01% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
0.58% |
|
| 10 Years |
rr_AverageAnnualReturnYear10 |
1.52% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Aug. 28,
1998 |
|
|
PRIME MONEY MARKET FUND | B CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.57% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
1.00% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
1.58% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
561 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
800 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
961 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,676 |
|
| Expense Example, No Redemption, 1 Year |
rr_ExpenseExampleNoRedemptionYear01 |
161 |
|
| Expense Example, No Redemption, 3 Years |
rr_ExpenseExampleNoRedemptionYear03 |
500 |
|
| Expense Example, No Redemption, 5 Years |
rr_ExpenseExampleNoRedemptionYear05 |
861 |
|
| Expense Example, No Redemption, 10 Years |
rr_ExpenseExampleNoRedemptionYear10 |
1,676 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
(3.99%) |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
0.18% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
1.15% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Jan. 31,
2003 |
|
|
PRIME MONEY MARKET FUND | C CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.57% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
0.75% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
1.33% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
136 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
422 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
730 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,601 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
0.01% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
0.44% |
|
| 10 Years |
rr_AverageAnnualReturnYear10 |
1.24% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
May
07,
2002 |
|
|
SHORT DURATION INFLATION PROTECTION BOND FUND
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Risk/Return [Heading] |
rr_RiskReturnHeading |
SHORT DURATION INFLATION PROTECTION BOND FUND |
|
| Objective [Heading] |
rr_ObjectiveHeading |
Investment Objective |
|
| Objective, Primary [Text Block] |
rr_ObjectivePrimaryTextBlock |
The fund pursues total return using a strategy that seeks to protect against U.S. inflation. |
|
| Expense [Heading] |
rr_ExpenseHeading |
Fees and Expenses |
|
| Expense Narrative [Text Block] |
rr_ExpenseNarrativeTextBlock |
The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. 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, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 14 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information. The fund's B Class shares are not available for purchase, except through exchanges and dividend reinvestments. |
|
| Shareholder Fees Caption [Text] |
rr_ShareholderFeesCaption |
Shareholder Fees (fees paid directly from your investment) |
|
| Operating Expenses Caption [Text] |
rr_OperatingExpensesCaption |
Annual
Fund Operating Expenses (expenses
that you pay each year as a percentage of the value of your investment) |
|
| Portfolio Turnover [Heading] |
rr_PortfolioTurnoverHeading |
Portfolio Turnover |
|
| Portfolio Turnover [Text Block] |
rr_PortfolioTurnoverTextBlock |
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 55% of the average value of its portfolio. |
|
| Portfolio Turnover, Rate |
rr_PortfolioTurnoverRate |
55.00% |
|
| Expense Breakpoint Discounts [Text] |
rr_ExpenseBreakpointDiscounts |
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, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 14 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information. The fund's B Class shares are not available for purchase, except through exchanges and dividend reinvestments. |
|
| Expense Breakpoint, Minimum Investment Required [Amount] |
rr_ExpenseBreakpointMinimumInvestmentRequiredAmount |
100,000 |
|
| Expense Example [Heading] |
rr_ExpenseExampleHeading |
Example |
|
| Expense Example Narrative [Text Block] |
rr_ExpenseExampleNarrativeTextBlock |
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] |
rr_ExpenseExampleByYearCaption |
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: |
|
| Strategy [Heading] |
rr_StrategyHeading |
Principal Investment Strategies |
|
| Strategy Narrative [Text Block] |
rr_StrategyNarrativeTextBlock |
Under normal market conditions, the fund invests at least 80% of its assets in inflation-linked debt securities. These securities include inflation-linked U.S. Treasury securities, inflation-linked securities issued by U.S. government agencies and instrumentalities other than the U.S. Treasury, and inflation-linked securities issued by other entities such as domestic and foreign corporations and governments. Inflation-linked securities are designed to protect the future purchasing power of the money invested in them.
The fund may invest in securities issued or guaranteed by the U.S. Treasury and certain U.S. government agencies or instrumentalities such as the Government National Mortgage Association (Ginnie Mae). Ginnie Mae is supported by the full faith and credit of the U.S. government. Securities issued or guaranteed by other U.S. government agencies or instrumentalities, such as the Federal National Mortgage Association (Fannie Mae), the Federal Home Loan Mortgage Corporation (Freddie Mac), and the Federal Home Loan Bank (FHLB) are not guaranteed by the U.S. Treasury or supported by the full faith and credit of the U.S. government. However, they are authorized to borrow from the U.S. Treasury to meet their obligations.
The fund also may invest up to 20% of its net assets in fixed-income securities that are not linked to inflation. These securities may include other debt securities, including mortgage- and asset-backed securities, whether issued by the U.S. government, its agencies or instrumentalities, corporations or other non-governmental issuers.
The fund may invest up to 20% of its total assets in securities denominated in foreign currencies and may invest beyond this limit in U.S. dollar denominated securities of foreign issuers. The fund invests primarily in investment-grade securities, but may invest up to 10% of its total assets in high-yield securities.
The fund also may invest in derivative instruments such as options, futures contracts, options on futures contracts, and swap agreements (including, but not limited to, credit default swap agreements), or in mortgage- or asset-backed securities, provided that such instruments are in keeping with the fund's investment objective.
The portfolio managers are not limited to a specific weighted average maturity range.
To determine whether to buy or sell a security, the portfolio managers consider, among other things, various fund requirements and standards, along with economic conditions, alternative investments and interest rates. |
|
| Risk [Heading] |
rr_RiskHeading |
Principal Risks |
|
| Risk Narrative [Text Block] |
rr_RiskNarrativeTextBlock |
|
• |
Interest
Rate Risk - Inflation-linked
securities trade at prevailing real interest rates. Generally, when real interest
rates rise, the value of the fund's debt securities will decline. The opposite is
true when real interest rates decline. The real interest rate is the current market
interest rate minus the market's inflation expectations. |
|
• |
Credit
Risk - 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's share price could also decrease. Changes in the credit rating
of a debt security held by the fund could have a similar effect. |
|
• |
Liquidity
Risk - 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's share price. |
|
• |
Nondiversification
Risk - The
fund is classified as nondiversified. This gives the portfolio managers the flexibility
to hold large positions in a small number of securities. If so, a price change in
any one of those securities may have a greater impact on the fund's share price
than would be the case in a diversified fund. |
|
• |
Prepayment
Risk - The
fund may invest in debt securities backed by mortgages or other assets. If these
underlying assets are prepaid, the fund may benefit less from declining interest
rates than funds of similar duration that invest less heavily in mortgage- and asset-backed
securities. |
|
• |
Derivatives
Risk - The
use of derivative instruments involves risks different from, or possibly greater
than, the risks associated with investing directly in securities and other traditional
instruments. Derivatives are subject to a number of risks including liquidity, interest
rate, market, credit and correlation risk. |
|
• |
Foreign
Securities Risk -
Foreign securities have certain unique risks, such as currency risk, social, political
and economic risk, and foreign market and trading risk. Securities of foreign
issuers may be less liquid, more volatile and harder to value than U.S. securities. |
| • |
Market Risk - The
value of securities owned by the fund may go up and down, sometimes rapidly or unpredictably. |
|
• |
Principal
Loss - 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. |
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. |
|
| Risk Lose Money [Text] |
rr_RiskLoseMoney |
|
Principal Loss -
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. |
|
|
| Risk Nondiversified Status [Text] |
rr_RiskNondiversifiedStatus |
Nondiversification Risk - The fund is classified as nondiversified. This gives the portfolio managers the flexibility to hold large positions in a small number of securities. If so, a price change in any one of those securities may have a greater impact on the fund's share price than would be the case in a diversified fund. |
|
| Risk Not Insured Depository Institution [Text] |
rr_RiskNotInsuredDepositoryInstitution |
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. |
|
| Bar Chart and Performance Table [Heading] |
rr_BarChartAndPerformanceTableHeading |
Fund Performance |
|
| Performance Narrative [Text Block] |
rr_PerformanceNarrativeTextBlock |
The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. Because the R6 Class is new, it is not included. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, including yields, please visit americancentury.com.
Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown. |
|
| Performance Information Illustrates Variability of Returns [Text] |
rr_PerformanceInformationIllustratesVariabilityOfReturns |
The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance.
|
|
| Performance Availability Website Address [Text] |
rr_PerformanceAvailabilityWebSiteAddress |
americancentury.com |
|
| Performance Past Does Not Indicate Future [Text] |
rr_PerformancePastDoesNotIndicateFuture |
The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. |
|
| Bar Chart [Heading] |
rr_BarChartHeading |
Calendar Year Total Returns |
|
| Bar Chart Does Not Reflect Sales Loads [Text] |
rr_BarChartDoesNotReflectSalesLoads |
Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown. |
|
| Bar Chart Closing [Text Block] |
rr_BarChartClosingTextBlock |
Highest Performance
Quarter (1Q 2008): 5.84%
Lowest
Performance Quarter (3Q 2008): -3.73%
As
of June 30, 2013, the most recent calendar quarter end, the fund's Investor Class year-to-date return was -2.79%.
|
|
| Year to Date Return, Label |
rr_YearToDateReturnLabel |
Investor Class year-to-date return |
|
| Bar Chart, Year to Date Return, Date |
rr_BarChartYearToDateReturnDate |
Jun. 30,
2013 |
|
| Bar Chart, Year to Date Return |
rr_BarChartYearToDateReturn |
(2.79%) |
|
| Highest Quarterly Return, Label |
rr_HighestQuarterlyReturnLabel |
Highest Performance Quarter |
|
| Highest Quarterly Return, Date |
rr_BarChartHighestQuarterlyReturnDate |
Mar. 31,
2008 |
|
| Highest Quarterly Return |
rr_BarChartHighestQuarterlyReturn |
5.84% |
|
| Lowest Quarterly Return, Label |
rr_LowestQuarterlyReturnLabel |
Lowest Performance Quarter |
|
| Lowest Quarterly Return, Date |
rr_BarChartLowestQuarterlyReturnDate |
Sep. 30,
2008 |
|
| Lowest Quarterly Return |
rr_BarChartLowestQuarterlyReturn |
(3.73%) |
|
| Performance Table Heading |
rr_PerformanceTableHeading |
Average Annual
Total Returns For the calendar year ended December 31, 2012 |
|
| Performance Table Uses Highest Federal Rate |
rr_PerformanceTableUsesHighestFederalRate |
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. |
|
| Performance Table Not Relevant to Tax Deferred |
rr_PerformanceTableNotRelevantToTaxDeferred |
Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs. |
|
| Performance Table One Class of after Tax Shown [Text] |
rr_PerformanceTableOneClassOfAfterTaxShown |
The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary. |
|
| Performance Table Closing [Text Block] |
rr_PerformanceTableClosingTextBlock |
The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs. |
|
|
SHORT DURATION INFLATION PROTECTION BOND FUND | INVESTOR CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
25 |
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.56% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.57% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
58 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
183 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
319 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
714 |
|
| Annual Return 2006 |
rr_AnnualReturn2006 |
0.06% |
|
| Annual Return 2007 |
rr_AnnualReturn2007 |
10.97% |
|
| Annual Return 2008 |
rr_AnnualReturn2008 |
(1.25%) |
|
| Annual Return 2009 |
rr_AnnualReturn2009 |
11.41% |
|
| Annual Return 2010 |
rr_AnnualReturn2010 |
5.46% |
|
| Annual Return 2011 |
rr_AnnualReturn2011 |
8.80% |
|
| Annual Return 2012 |
rr_AnnualReturn2012 |
3.44% |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
3.44% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
5.48% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
5.01% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
May 31,
2005 |
|
|
SHORT DURATION INFLATION PROTECTION BOND FUND | INSTITUTIONAL CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.36% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.37% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
38 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
119 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
208 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
469 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
3.52% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
5.68% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
5.27% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
May 31,
2005 |
|
|
SHORT DURATION INFLATION PROTECTION BOND FUND | A CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
2.25% |
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.56% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
0.25% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.82% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
307 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
481 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
670 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,216 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
0.75% |
[2] |
| 5 Years |
rr_AverageAnnualReturnYear05 |
4.73% |
[2] |
| Since Inception |
rr_AverageAnnualReturnSinceInception |
4.45% |
[2] |
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
May 31,
2005 |
[2] |
|
SHORT DURATION INFLATION PROTECTION BOND FUND | B CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
5.00% |
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.56% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
1.00% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
1.57% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
560 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
796 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
956 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,665 |
|
| Expense Example, No Redemption, 1 Year |
rr_ExpenseExampleNoRedemptionYear01 |
160 |
|
| Expense Example, No Redemption, 3 Years |
rr_ExpenseExampleNoRedemptionYear03 |
496 |
|
| Expense Example, No Redemption, 5 Years |
rr_ExpenseExampleNoRedemptionYear05 |
856 |
|
| Expense Example, No Redemption, 10 Years |
rr_ExpenseExampleNoRedemptionYear10 |
1,665 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
(1.65%) |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
4.25% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
3.99% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
May 31,
2005 |
|
|
SHORT DURATION INFLATION PROTECTION BOND FUND | C CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
1.00% |
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.56% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
1.00% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
1.57% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
160 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
496 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
856 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,866 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
2.35% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
4.42% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
4.01% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
May 31,
2005 |
|
|
SHORT DURATION INFLATION PROTECTION BOND FUND | R CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.56% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
0.50% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
1.07% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
109 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
341 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
591 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,306 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
2.87% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
4.95% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
4.52% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
May 31,
2005 |
|
|
SHORT DURATION INFLATION PROTECTION BOND FUND | R6 CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.31% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.32% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
33 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
103 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
180 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
406 |
|
|
SHORT DURATION INFLATION PROTECTION BOND FUND | Return After Taxes on Distributions | INVESTOR CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
2.91% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
4.15% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
3.62% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
May 31,
2005 |
|
|
SHORT DURATION INFLATION PROTECTION BOND FUND | Return After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
2.23% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
3.99% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
3.52% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
May 31,
2005 |
|
|
SHORT DURATION INFLATION PROTECTION BOND FUND | Barclays U.S. 1-5 Year Treasury Inflation Protected Securities (TIPS) Index (reflects no deduction for fees, expenses or taxes)
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
2.66% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
3.98% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
4.41% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
May 31,
2005 |
|
|
SHORT DURATION FUND
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Risk/Return [Heading] |
rr_RiskReturnHeading |
SHORT DURATION FUND |
|
| Objective [Heading] |
rr_ObjectiveHeading |
Investment Objective |
|
| Objective, Primary [Text Block] |
rr_ObjectivePrimaryTextBlock |
The fund seeks
to maximize total return. |
|
| Objective, Secondary [Text Block] |
rr_ObjectiveSecondaryTextBlock |
As a secondary objective, the fund seeks a high level of income. |
|
| Expense [Heading] |
rr_ExpenseHeading |
Fees and Expenses |
|
| Expense Narrative [Text Block] |
rr_ExpenseNarrativeTextBlock |
The following table describes the fees and expenses you may pay if you buy and hold shares of the fund. 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, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 14 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information. |
|
| Shareholder Fees Caption [Text] |
rr_ShareholderFeesCaption |
Shareholder Fees (fees paid directly from your investment) |
|
| Operating Expenses Caption [Text] |
rr_OperatingExpensesCaption |
Annual
Fund Operating Expenses (expenses
that you pay each year as a percentage of the value of your investment) |
|
| Portfolio Turnover [Heading] |
rr_PortfolioTurnoverHeading |
Portfolio Turnover |
|
| Portfolio Turnover [Text Block] |
rr_PortfolioTurnoverTextBlock |
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 77% of the average value of its portfolio. |
|
| Portfolio Turnover, Rate |
rr_PortfolioTurnoverRate |
77.00% |
|
| Expense Breakpoint Discounts [Text] |
rr_ExpenseBreakpointDiscounts |
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, as well as variations in charges that may apply to purchases of $1 million or more, is available from your financial professional and in Calculation of Sales Charges on page 14 of the fund's prospectus and Sales Charges in Appendix B of the statement of additional information. |
|
| Expense Breakpoint, Minimum Investment Required [Amount] |
rr_ExpenseBreakpointMinimumInvestmentRequiredAmount |
100,000 |
|
| Expense Example [Heading] |
rr_ExpenseExampleHeading |
Example |
|
| Expense Example Narrative [Text Block] |
rr_ExpenseExampleNarrativeTextBlock |
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] |
rr_ExpenseExampleByYearCaption |
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: |
|
| Strategy [Heading] |
rr_StrategyHeading |
Principal Investment Strategies |
|
| Strategy Narrative [Text Block] |
rr_StrategyNarrativeTextBlock |
The fund invests at least 65% of its assets in investment-grade, non-money market debt securities. An investment-grade security is one that has been rated by a nationally recognized statistical rating organization in its top four credit quality categories or determined by the advisor to be of comparable credit quality. Debt securities include fixed-income investments such as notes, bonds, commercial paper and U.S. Treasury securities. These securities, which may be payable in U.S. or foreign currencies, may include corporate bonds and notes, government securities and securities backed by mortgages or other assets.
To round out the portfolio, the fund may invest up to 35% of its assets in high-yield and/or emerging markets debt securities. A high-yield security is one that has been rated below the four highest categories used by a nationally recognized statistical rating organization, or determined by the investment advisor to be of similar quality. The fund considers a security to be an emerging markets security if its issuer is located outside the following list of developed countries: Australia, Austria, Belgium, Bermuda, Canada, Denmark, Finland, France, Germany, Greece, Hong Kong, Ireland, Israel, Italy, Japan, Luxembourg, the Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland, the United Kingdom and the United States.
No more than 10% of the fund's assets may be invested in non-dollar denominated debt securities.
The fund may invest in securities issued or guaranteed by the U.S. Treasury and certain U.S. government agencies or instrumentalities such as the Government National Mortgage Association (Ginnie Mae). Ginnie Mae is supported by the full faith and credit of the U.S. government. Securities issued or guaranteed by other U.S. government agencies or instrumentalities, such as the Federal National Mortgage Association (Fannie Mae), the Federal Home Loan Mortgage Corporation (Freddie Mac), and the Federal Home Loan Bank (FHLB) are not guaranteed by the U.S. Treasury or supported by the full faith and credit of the U.S. government. However, they are authorized to borrow from the U.S. Treasury to meet their obligations.
The fund also may invest in derivative instruments such as options, futures contracts, options on futures contracts, and swap agreements (including, but not limited to, credit default swap agreements), or in mortgage- or asset-backed securities, provided that such investments are in keeping with the fund's investment objectives.
The weighted average duration of the fund's portfolio must be three years or shorter. Duration is an indication of the relative sensitivity of a security's market value to changes in interest rates. The longer the weighted average duration of the fund's portfolio, the more sensitive its market value is to interest rate fluctuations. Duration is different from maturity in that it attempts to measure the interest rate sensitivity of a security, as opposed to its expected final maturity.
To determine whether to buy or sell a security, the portfolio managers consider, among other things, various fund requirements and standards, along with economic conditions, alternative investments and interest rates. |
|
| Risk [Heading] |
rr_RiskHeading |
Principal Risks |
|
| Risk Narrative [Text Block] |
rr_RiskNarrativeTextBlock |
|
• |
Interest
Rate Risk - Investments
in debt securities are sensitive to interest rate changes. Generally, the value
of debt securities and the funds that hold them decline as interest rates rise.
The fund's investments are designed to reduce this risk. Interest rate risk, however,
is generally higher for Short Duration than for funds that have a shorter-weighted
average duration, such as money market funds. |
|
• |
Credit
Risk - 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's share price could also decrease. Changes in the credit rating
of a debt security held by the fund could have a similar effect. |
|
• |
Liquidity
Risk - 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's share price. |
|
• |
Prepayment
Risk - The
fund may invest in debt securities backed by mortgages or other assets. If these
underlying assets are prepaid, the fund may benefit less from declining interest
rates than funds of similar duration that invest less heavily in mortgage- and asset-backed
securities. |
|
• |
Foreign
Securities Risk -
The fund may invest in foreign securities, which are generally riskier than
U.S. securities. As a result the fund may be subject to foreign risk, meaning that
political events (such as civil unrest, national elections and imposition of exchange
controls), social and economic events (such as labor strikes and rising inflation),
and natural disasters occurring in a country where the fund invests could cause
the fund's investments in that country to experience losses. For these and other
reasons, securities of foreign issuers may be less liquid, more volatile and harder
to value than U.S. securities. |
|
• |
Currency
Risk - Because
the fund may invest in securities denominated in foreign currencies, the fund may
be subject to currency risk, meaning that the fund could experience gains or losses
based solely on changes in the exchange rate between foreign currencies and the
U.S. dollar. |
|
• |
Emerging
Market Risk -
Investing in securities of companies located in emerging market countries generally
is also riskier than investing in securities of companies located in foreign developed
countries. Emerging market countries may have unstable governments and/or economies
that are subject to sudden change. These changes may be magnified by the countries'
emergent financial markets, resulting in significant volatility to investments in
these countries. These countries also may lack the legal, business and social framework
to support securities markets. |
|
• |
Derivative
Risk - The
use of derivative instruments involves risks different from, or possibly greater
than, the risks associated with investing directly in securities and other traditional
instruments. Derivatives are subject to a number of risks, including liquidity,
interest rate, market, credit and correlation risk. |
|
• |
Market
Risk - The value of securities owned by the fund may
go up and down, sometimes rapidly or unpredictably. |
|
• |
Principal
Loss - 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. |
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. |
|
| Risk Lose Money [Text] |
rr_RiskLoseMoney |
|
Principal Loss -
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. |
|
|
| Risk Not Insured Depository Institution [Text] |
rr_RiskNotInsuredDepositoryInstitution |
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. |
|
| Bar Chart and Performance Table [Heading] |
rr_BarChartAndPerformanceTableHeading |
Fund Performance |
|
| Performance Narrative [Text Block] |
rr_PerformanceNarrativeTextBlock |
The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. For current performance information, including yields, please visit americancentury.com.
Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown. |
|
| Performance Information Illustrates Variability of Returns [Text] |
rr_PerformanceInformationIllustratesVariabilityOfReturns |
The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund's performance from year to year for Investor Class shares. The table shows how the fund's average annual returns for the periods shown compared with those of a broad measure of market performance.
|
|
| Performance Availability Website Address [Text] |
rr_PerformanceAvailabilityWebSiteAddress |
americancentury.com |
|
| Performance Past Does Not Indicate Future [Text] |
rr_PerformancePastDoesNotIndicateFuture |
The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. |
|
| Bar Chart [Heading] |
rr_BarChartHeading |
Calendar Year Total Returns |
|
| Bar Chart Does Not Reflect Sales Loads [Text] |
rr_BarChartDoesNotReflectSalesLoads |
Sales charges and account fees, if applicable, are not reflected in the bar chart. If those charges were included, returns would be less than those shown. |
|
| Bar Chart Closing [Text Block] |
rr_BarChartClosingTextBlock |
Highest Performance
Quarter (1Q 2008): 2.32%
Lowest Performance Quarter (4Q
2010): -0.10%
As of June 30, 2013, the most
recent calendar quarter end, the fund's Investor Class year-to-date return was -0.50%.
|
|
| Year to Date Return, Label |
rr_YearToDateReturnLabel |
Investor Class year-to-date return |
|
| Bar Chart, Year to Date Return, Date |
rr_BarChartYearToDateReturnDate |
Jun. 30,
2013 |
|
| Bar Chart, Year to Date Return |
rr_BarChartYearToDateReturn |
(0.50%) |
|
| Highest Quarterly Return, Label |
rr_HighestQuarterlyReturnLabel |
Highest Performance Quarter |
|
| Highest Quarterly Return, Date |
rr_BarChartHighestQuarterlyReturnDate |
Mar. 31,
2008 |
|
| Highest Quarterly Return |
rr_BarChartHighestQuarterlyReturn |
2.32% |
|
| Lowest Quarterly Return, Label |
rr_LowestQuarterlyReturnLabel |
Lowest Performance Quarter |
|
| Lowest Quarterly Return, Date |
rr_BarChartLowestQuarterlyReturnDate |
Dec. 31,
2010 |
|
| Lowest Quarterly Return |
rr_BarChartLowestQuarterlyReturn |
(0.10%) |
|
| Performance Table Heading |
rr_PerformanceTableHeading |
Average Annual
Total Returns For the calendar year ended December 31, 2012 |
|
| Performance Table Uses Highest Federal Rate |
rr_PerformanceTableUsesHighestFederalRate |
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. |
|
| Performance Table Not Relevant to Tax Deferred |
rr_PerformanceTableNotRelevantToTaxDeferred |
Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs. |
|
| Performance Table One Class of after Tax Shown [Text] |
rr_PerformanceTableOneClassOfAfterTaxShown |
The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary. |
|
| Performance Table Closing [Text Block] |
rr_PerformanceTableClosingTextBlock |
The after-tax returns are shown only for Investor Class shares. After-tax returns for other share classes will vary. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or IRAs. |
|
|
SHORT DURATION FUND | INVESTOR CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
25 |
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.59% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.60% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
61 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
193 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
335 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
751 |
|
| Annual Return 2007 |
rr_AnnualReturn2007 |
6.35% |
|
| Annual Return 2008 |
rr_AnnualReturn2008 |
5.50% |
|
| Annual Return 2009 |
rr_AnnualReturn2009 |
5.09% |
|
| Annual Return 2010 |
rr_AnnualReturn2010 |
3.29% |
|
| Annual Return 2011 |
rr_AnnualReturn2011 |
2.00% |
|
| Annual Return 2012 |
rr_AnnualReturn2012 |
2.14% |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
2.14% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
3.59% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
3.98% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Nov. 30,
2006 |
|
|
SHORT DURATION FUND | INSTITUTIONAL CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.39% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.40% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
41 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
129 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
225 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
506 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
2.35% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
3.80% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
4.18% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Nov. 30,
2006 |
|
|
SHORT DURATION FUND | A CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
2.25% |
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.59% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
0.25% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
0.85% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
310 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
491 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
686 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,251 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
(0.40%) |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
2.87% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
3.33% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Nov. 30,
2006 |
|
|
SHORT DURATION FUND | C CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
1.00% |
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.59% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
1.00% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
1.60% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
163 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
506 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
872 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
1,899 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
1.14% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
2.56% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
2.95% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Nov. 30,
2006 |
|
|
SHORT DURATION FUND | R CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) |
rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice |
none
|
|
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) |
rr_MaximumDeferredSalesChargeOverOfferingPrice |
none
|
|
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) |
rr_MaximumAccountFee |
none
|
|
| Management Fee |
rr_ManagementFeesOverAssets |
0.59% |
|
| Distribution and Service (12b-1) Fees |
rr_DistributionAndService12b1FeesOverAssets |
0.50% |
|
| Other Expenses |
rr_OtherExpensesOverAssets |
0.01% |
|
| Total Annual Fund Operating Expenses |
rr_ExpensesOverAssets |
1.10% |
|
| Expense Example, with Redemption, 1 Year |
rr_ExpenseExampleYear01 |
112 |
|
| Expense Example, with Redemption, 3 Years |
rr_ExpenseExampleYear03 |
350 |
|
| Expense Example, with Redemption, 5 Years |
rr_ExpenseExampleYear05 |
607 |
|
| Expense Example, with Redemption, 10 Years |
rr_ExpenseExampleYear10 |
$ 1,340 |
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
1.64% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
3.07% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
3.46% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Nov. 30,
2006 |
|
|
SHORT DURATION FUND | Return After Taxes on Distributions | INVESTOR CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
1.75% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
2.64% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
2.91% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Nov. 30,
2006 |
|
|
SHORT DURATION FUND | Return After Taxes on Distributions and Sale of Fund Shares | INVESTOR CLASS
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
1.49% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
2.53% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
2.79% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Nov. 30,
2006 |
|
|
SHORT DURATION FUND | Barclays U.S. 1-3 Year Government/Credit Bond Index (reflects no deduction for fees, expenses or taxes)
|
|
|
|
| Prospectus [Line Items] |
rr_ProspectusLineItems |
|
|
| 1 Year |
rr_AverageAnnualReturnYear01 |
1.26% |
|
| 5 Years |
rr_AverageAnnualReturnYear05 |
2.88% |
|
| Since Inception |
rr_AverageAnnualReturnSinceInception |
3.49% |
|
| Inception Date |
rr_AverageAnnualReturnInceptionDate |
Nov. 30,
2006 |
|
|
|
|