| Label | Element | Value | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Prospectus Summary | Lord Abbett High Yield Fund | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk/Return [Heading] | oef_RiskReturnHeading | High Yield Fund | ||||||||||
| Objective [Heading] | oef_ObjectiveHeading | INVESTMENT OBJECTIVE | ||||||||||
| Objective, Primary [Text Block] | oef_ObjectivePrimaryTextBlock | The Fund’s investment objective is to seek a high current income and the opportunity for capital appreciation to produce a high total return. | ||||||||||
| Expense Heading [Optional Text] | oef_ExpenseHeading | FEES AND EXPENSES | ||||||||||
| Expense Narrative [Text Block] | oef_ExpenseNarrativeTextBlock | This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 292 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”). |
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| Shareholder Fees Caption [Optional Text] | oef_ShareholderFeesCaption | Shareholder Fees (Fees paid directly from your investment) | ||||||||||
| Operating Expenses Caption [Optional Text] | oef_OperatingExpensesCaption | Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment) | ||||||||||
| Portfolio Turnover [Heading] | oef_PortfolioTurnoverHeading | Portfolio Turnover | ||||||||||
| Portfolio Turnover [Text Block] | oef_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 the 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 79% of the average value of its portfolio. | ||||||||||
| Portfolio Turnover, Rate | oef_PortfolioTurnoverRate | 79.00% | ||||||||||
| Expense Breakpoint Discounts [Text] | oef_ExpenseBreakpointDiscounts | You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $100,000 in the Lord Abbett Family of Funds. | ||||||||||
| Expense Breakpoint, Minimum Investment Required [Amount] | oef_ExpenseBreakpointMinimumInvestmentRequiredAmount | $ 100,000 | ||||||||||
| Expense Example [Heading] | oef_ExpenseExampleHeading | Example | ||||||||||
| Expense Example Narrative [Text Block] | oef_ExpenseExampleNarrativeTextBlock | This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. 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. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be: |
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| Expense Example by, Year, Caption [Text] | oef_ExpenseExampleByYearCaption | If Shares Are Redeemed | ||||||||||
| Expense Example, No Redemption, By Year, Caption [Text] | oef_ExpenseExampleNoRedemptionByYearCaption | If Shares Are Not Redeemed | ||||||||||
| Strategy [Heading] | oef_StrategyHeading | PRINCIPAL INVESTMENT STRATEGIES | ||||||||||
| Strategy Narrative [Text Block] | oef_StrategyNarrativeTextBlock | Under normal conditions, the Fund pursues its investment objective by investing at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in lower-rated debt securities (commonly referred to as “high-yield” or “junk” bonds), including corporate debt securities and securities that are convertible into common stock or have warrants to purchase common stock. The Fund may invest in debt securities of any credit quality, including defaulted securities (i.e., bonds on which the issuer has not paid principal or interest on time) and securities of issuers that are or may become involved in reorganizations, financial restructurings, or bankruptcy (commonly referred to as “distressed debt”). The Fund may invest in structured securities and other hybrid instruments, including collateralized loan obligations (“CLOs”). The Fund may invest up to 20% of its net assets in foreign securities (including emerging market securities and American Depositary Receipts (“ADRs”)). The Fund defines foreign securities as securities of non-U.S. issuers that are denominated in non-U.S. currencies. In addition, the Fund may invest up to 20% of its net assets in municipal securities. The Fund also may invest up to 15% of its net assets in floating or adjustable rate loans, including bridge loans, novations, assignments, and participations. The Fund also may invest up to 20% of its net assets in equity securities. Equity securities include common stocks, preferred stocks, convertible preferred stocks, warrants, rights to purchase equity securities of an issuer, and equity interests in trusts and partnerships, including real estate investment trusts (“REITs”). The Fund may acquire equity securities as a result of restructurings of debt securities held in its portfolio. In addition, the Fund may purchase equity securities to pursue capital appreciation or to diversify its portfolio. The Fund may invest in mortgage-backed, mortgage-related, and other asset-backed securities, which directly or indirectly represent a participation in, or are secured by and payable from, mortgage loans, real property, or other assets. The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to mortgage-backed securities, privately issued mortgage-related securities, or securities issued by the U.S. Government, its agencies and instrumentalities. The Fund may use derivatives to hedge against risk or to gain investment exposure. Currently, the Fund expects to invest in derivatives consisting principally of futures, forwards, options, and swaps. The Fund may use derivatives to seek to enhance returns, to attempt to hedge some of its investment risk, to manage portfolio duration, as a substitute for holding the underlying asset on which the derivative instrument is based, or for cash management purposes. For example, the Fund may invest in or sell short U.S. Treasury futures, securities index futures, other futures, and/or currency forwards to adjust the Fund’s exposure to the direction of interest rates, or for other portfolio management reasons. The Fund believes high total return (current income and capital appreciation) may be derived from an actively-managed, diversified portfolio of investments. In addition to seeking current income, the Fund seeks to invest across the ratings spectrum, particularly in lower-rated debt securities. The Fund seeks to purchase lower-rated securities the Fund believes will experience declining credit risk, allowing the securities potentially to generate higher returns. The portfolio management team selects securities using a bottom-up analysis of an issuer’s management quality, credit risk, and relative market position, and industry dynamics, as well as an evaluation of conditions within the broader economy. The portfolio management team attempts to reduce risk through portfolio diversification, credit analysis, and attention to current developments and trends in interest rates and economic conditions. The Fund engages in active and frequent trading of its portfolio securities. The Fund may sell a security when the Fund believes the security is less likely to benefit from the current market and economic environment, or shows signs of deteriorating fundamentals, among other reasons. The Fund may deviate from the investment strategy described above for temporary defensive purposes. The Fund may miss certain investment opportunities if defensive strategies are used and thus may not achieve its investment objective. |
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| Strategy Portfolio Concentration [Text] | oef_StrategyPortfolioConcentration | The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to mortgage-backed securities, privately issued mortgage-related securities, or securities issued by the U.S. Government, its agencies and instrumentalities. | ||||||||||
| Bar Chart and Performance Table [Heading] | oef_BarChartAndPerformanceTableHeading | PERFORMANCE | ||||||||||
| Performance Narrative [Text Block] | oef_PerformanceNarrativeTextBlock | The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. No performance is shown for Class P shares because the Fund has no Class P shares outstanding. |
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| Performance Information Illustrates Variability of Returns [Text] | oef_PerformanceInformationIllustratesVariabilityOfReturns | The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. | ||||||||||
| Performance Availability Phone [Text] | oef_PerformanceAvailabilityPhone | 888-522-2388 | ||||||||||
| Performance Availability Website Address [Text] | oef_PerformanceAvailabilityWebSiteAddress | www.lordabbett.com | ||||||||||
| Performance Past Does Not Indicate Future [Text] | oef_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] | oef_BarChartHeading | Bar Chart (per calendar year) - Class A Shares | ||||||||||
| Bar Chart Narrative [Text Block] | oef_BarChartNarrativeTextBlock | The bar chart shows changes in the performance of the Fund’s Class A shares from calendar year to calendar year. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. Performance for the Fund’s other share classes will vary due to the different expenses each class bears. Updated performance information is available at www.lordabbett.com or by calling 888-522-2388. |
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| Bar Chart Does Not Reflect Sales Loads [Text] | oef_BarChartDoesNotReflectSalesLoads | This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. | ||||||||||
| Bar Chart Closing [Text Block] | oef_BarChartClosingTextBlock | Best Quarter 2nd Q 2020 +10.72% Worst Quarter 1st Q 2020 -16.65% |
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| Performance Table Heading | oef_PerformanceTableHeading | Average Annual Total Returns (for the periods ended December 31, 2025) | ||||||||||
| Performance Table Does Reflect Sales Loads | oef_PerformanceTableDoesReflectSalesLoads | The Fund’s average annual total returns include applicable sales charges. | ||||||||||
| Index No Deduction for Fees, Expenses, or Taxes [Text] | oef_IndexNoDeductionForFeesExpensesTaxes | (reflects no deduction for fees, expenses, or taxes) | ||||||||||
| Performance Table Uses Highest Federal Rate | oef_PerformanceTableUsesHighestFederalRate | The after-tax returns of Class A shares included in the table below 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 | oef_PerformanceTableNotRelevantToTaxDeferred | The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). | ||||||||||
| Performance Table One Class of after Tax Shown [Text] | oef_PerformanceTableOneClassOfAfterTaxShown | After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares. | ||||||||||
| Performance Table Explanation after Tax Higher | oef_PerformanceTableExplanationAfterTaxHigher | In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. | ||||||||||
| Performance Table Narrative | oef_PerformanceTableNarrativeTextBlock | The table below shows how the Fund’s average annual total returns compare to the returns of a securities market index with investment characteristics similar to those of the Fund as well as to a broad-based securities market index.1 The Fund’s average annual total returns include applicable sales charges. The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares. 1The Fund has adopted the Bloomberg U.S. Aggregate Bond Index as its broad-based securities market index. |
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| Prospectus Summary | Lord Abbett High Yield Fund | PRINCIPAL RISKS | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | PRINCIPAL RISKS As with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. The principal risks of investing in the Fund, which could adversely affect its performance, include: |
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| Prospectus Summary | Lord Abbett High Yield Fund | Risk Lose Money [Member] | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | As with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. | ||||||||||
| Prospectus Summary | Lord Abbett High Yield Fund | Risk Not Insured [Member] | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. | ||||||||||
| Prospectus Summary | Lord Abbett High Yield Fund | · Portfolio Management Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Portfolio Management Risk: If the strategies used and investments selected by the Fund’s portfolio management team fail to produce the intended result, the Fund may suffer losses or underperform other funds with the same investment objective or strategies, even in a favorable market. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · Market Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Market Risk: The market values of securities will fluctuate, sometimes sharply and unpredictably, based on overall economic conditions, governmental actions or intervention, market disruptions caused by trade disputes, tariffs or other factors, political developments, and other factors. Prices of equity securities tend to rise and fall more dramatically than those of debt securities. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · Fixed Income Securities Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Fixed Income Securities Risk: The Fund is subject to the general risks and considerations associated with investing in debt securities, including the risk that issuers will fail to make timely payments of principal or interest or default altogether. Lower-rated securities in which the Fund may invest may be more volatile and may decline more in price in response to negative issuer developments or general economic news due to their increased credit risk relative to other fixed-income investments. In addition, as interest rates rise, the Fund’s investments typically will lose value. Fiscal, economic, monetary, or other governmental policies or measures have in the past—and may in the future—cause or exacerbate interest rate risks. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · High Yield Securities Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · High Yield Securities Risk: High yield securities (commonly referred to as “junk” bonds) typically pay a higher yield than investment grade securities, but may have greater price fluctuations and have a higher risk of default than investment grade securities. The market for high yield securities may be less liquid due to such factors as interest rate sensitivity, negative perceptions of the junk bond markets generally, and less secondary market liquidity. This may make such securities more difficult to sell at an acceptable price, especially during periods of financial distress, increased market volatility, or significant market decline. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · Credit Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Credit Risk: Debt securities are subject to the risk that the issuer or guarantor of a security may not make interest and principal payments as they become due or may default altogether. In addition, if the market perceives a deterioration in the creditworthiness of an issuer, the value and liquidity of securities issued by that issuer may decline. To the extent that the Fund holds below investment grade securities, these risks may be heightened. Insured debt securities have the credit risk of the insurer in addition to the credit risk of the underlying investment being insured. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · Interest Rate Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Interest Rate Risk: As interest rates rise, prices of bonds (including tax-exempt bonds) generally fall, typically causing the Fund’s investments to lose value. Additionally, rising interest rates or lack of market participants may lead to decreased liquidity in fixed income markets. Interest rate changes generally have a more pronounced effect on the market value of fixed-rate instruments, such as corporate bonds, than they have on floating rate instruments, and typically have a greater effect on the price of fixed income securities with longer durations. A wide variety of market factors can cause interest rates to rise, including central bank monetary policy, rising inflation, and changes in general economic conditions. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · Foreign Currency Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Foreign Currency Risk: Investments in securities that are denominated or receiving revenues in foreign currencies are subject to the risk that those currencies will decline in value relative to the U.S. dollar, or, in the case of hedged positions, that the U.S. dollar will decline in value relative to the currency being hedged. Foreign currency exchange rates may fluctuate significantly over short periods of time. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · Liquidity/Redemption Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Liquidity/Redemption Risk: The Fund may lose money when selling securities at inopportune times to fulfill shareholder redemption requests. The risk of loss may increase depending on the size and frequency of redemption requests, whether the redemption requests occur in times of overall market turmoil or declining prices, and whether the securities the Fund intends to sell have decreased in value or are illiquid. The Fund may be less able to sell illiquid securities at its desired time or price. It may be more difficult for the Fund to value its investments in illiquid securities than more liquid securities. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · Convertible Securities Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Convertible Securities Risk: Convertible securities are subject to the risks affecting both equity and fixed income securities, including market, credit, liquidity, and interest rate risk. Convertible securities tend to be more volatile than other fixed income securities, and the markets for convertible securities may be less liquid than markets for common stocks or bonds. A significant portion of convertible securities have below investment grade credit ratings and are subject to increased credit and liquidity risks. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · Equity Securities Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Equity Securities Risk: Equity securities, as well as equity-like securities such as convertible debt securities, may experience significant volatility. Such securities may fall sharply in response to adverse events affecting overall markets, a particular industry or sector, or an individual company’s financial condition. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · Industry and Sector Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Industry and Sector Risk: Although the Fund does not employ an industry or sector focus, its exposure to specific industries or sectors will increase from time to time based on the portfolio management team’s perception of investment opportunities. If the Fund is overweight in a single industry or sector relative to its benchmark index, the Fund will face an increased risk that the value of its portfolio will decrease because of events disproportionately affecting that industry or sector. Furthermore, investments in particular industries or sectors may be more volatile than the broader market as a whole. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · Municipal Securities Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Municipal Securities Risk: Municipal securities are subject to the same risks affecting fixed income securities in general. In addition, the prices of municipal securities may be adversely affected by legislative or political changes, tax rulings, judicial action, changes in market and economic conditions, and the fiscal condition of the municipal issuer, including an insolvent municipality filing for bankruptcy. The Fund may be more sensitive to these events and conditions if it invests a substantial portion of its assets in the municipal securities of similar projects (such as those relating to education, health care, housing, transportation, and utilities), in particular types of municipal securities (such as general obligation bonds, private activity bonds, and special tax bonds), or in the securities of issuers located within a single state, municipality, territory (such as Puerto Rico), or geographic area. The market for municipal securities generally is less liquid than other securities markets, which may make it more difficult for the Fund to sell its municipal securities. Nongovernmental users of facilities financed by tax-exempt revenue bonds (e.g., companies in the electric utility and health care industries) may have difficulty making payments on their obligations in the event of an economic downturn. This would negatively affect the valuation of municipal securities issued by such facilities. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · Government Securities Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Government Securities Risk: The Fund invests in securities issued or guaranteed by the U.S. Government or its agencies and instrumentalities (such as the Government National Mortgage Association (“Ginnie Mae”), the Federal National Mortgage Association (“Fannie Mae”), or the Federal Home Loan Mortgage Corporation (“Freddie Mac”)). Different types of U.S. government securities are subject to different levels of credit risk, including the risk of default, depending on the nature of the particular government support for that security. Unlike Ginnie Mae securities, securities issued or guaranteed by U.S. Government-related organizations, such as Fannie Mae and Freddie Mac, are not backed by the full faith and credit of the U.S. Government and no assurance can be given that the U.S. Government would provide financial support. Past long-term U.S. credit rating downgrades have introduced greater uncertainty about the ability of the United States to repay its obligations. The value of the Fund’s shares may be adversely affected by any future rating agency downgrades. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · Mortgage-Related and Other Asset-Backed Securities Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related securities, including commercial mortgage-backed securities (“CMBS”) and other privately issued mortgage-related securities, and other asset-backed securities may be particularly sensitive to changes in prevailing interest rates and economic conditions, including delinquencies and defaults. The prices of mortgage-related and other asset-backed securities, depending on their structure and the rate of payments, can be volatile. They are subject to prepayment risk (higher than expected prepayment rates of mortgage obligations due to a fall in market interest rates) and extension risk (lower than expected prepayment rates of mortgage obligations due to a rise in market interest rates). These risks increase the Fund’s overall interest rate risk. Some mortgage-related securities receive government or private support, but there is no assurance that such support will remain in place. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · Foreign and Emerging Market Company Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Foreign and Emerging Market Company Risk: Investments in foreign companies and in U.S. companies with economic ties to foreign markets generally involve special risks. These companies may be more vulnerable to economic, political, and social instability and subject to less government supervision, lack of transparency, inadequate regulatory and accounting standards, and foreign taxes. Foreign company securities also include ADRs, which may be less liquid than the underlying shares in their primary trading market. Foreign securities also may subject the Fund’s investments to changes in currency exchange rates. Emerging market securities generally are more volatile than other foreign securities, and are subject to greater liquidity, regulatory, and political risks. Investments in emerging markets may be considered speculative and generally are riskier than investments in more developed markets. Emerging markets are more likely to experience hyperinflation and currency devaluations. Securities of emerging market companies may have far lower trading volumes and less liquidity than securities of issuers in developed markets. In certain emerging market countries, governments participate to a significant degree in their respective economies. Action by these governments could have a significant adverse effect on market prices of securities and payment of dividends. Companies with economic ties to emerging markets may be susceptible to the same risks as companies organized in emerging markets. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · Loan Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Loan Risk: Investments in floating or adjustable rate loans are subject to increased credit and liquidity risks. Loan prices also may be adversely affected by supply-demand imbalances caused by conditions in the loan market or related markets. Below investment grade loans, like high-yield debt securities, or junk bonds, usually are more credit sensitive than interest rate sensitive, although the value of these instruments may be affected by interest rate swings in the overall fixed income market. Loans may be subject to structural subordination and may be subordinated to other obligations of the borrower or its subsidiaries. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · Defaulted Bonds Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Defaulted Bonds Risk: Defaulted bonds are subject to greater risk of loss of income and principal than securities of issuers whose debt obligations are being met. Defaulted bonds are considered speculative with respect to the issuer’s ability to make interest payments and pay its obligations in full. The repayment of defaulted bonds therefore is subject to significant uncertainties, and in some cases, there may be no recovery of repayment. Defaulted bonds may be repaid only after lengthy workout or bankruptcy proceedings, which typically result in only partial recovery of cash payments or an exchange of the defaulted bond for other securities of the issuer or its affiliates. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · Distressed Debt Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Distressed Debt Risk: Distressed bonds are speculative and involve substantial risks in addition to the risks of investing in high-yield debt securities. The Fund is subject to an increased risk that it may lose a portion or all of its investment in the distressed debt and may incur higher expenses trying to protect its interests in distressed debt. The prices of distressed bonds are likely to be more sensitive to adverse economic changes or individual issuer developments than the prices of higher rated securities. During an economic downturn or substantial period of rising interest rates, distressed debt issuers may experience financial stress that would adversely affect their ability to service their principal and interest payment obligations. Moreover, it is unlikely that a liquid market will exist for the Fund to sell its holdings in distressed debt securities. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · Collateralized Loan Obligations and Other Collateralized Obligations Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Collateralized Loan Obligations and Other Collateralized Obligations Risk: An investment in a CLO can be viewed as investing in (or through) another investment adviser and is subject to the layering of fees associated with such an investment. The risks of investing in a CLO generally can be summarized as a combination of economic risks of the underlying loans combined with the risks associated with the CLO structure governing the priority of payments, and include interest rate risk, credit risk, liquidity risk, prepayment risk, and the risk of default of the underlying asset, among others. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · Derivatives Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · Derivatives Risk: The risks associated with derivatives may be different from and greater than the risks associated with directly investing in securities and other investments. Derivatives may increase the Fund’s volatility and reduce its returns. Derivatives may not perform as expected and the Fund may not realize the intended benefits. Whether the Fund’s use of derivatives is successful may depend on, among other things, the portfolio managers’ ability to correctly forecast market movements, company and industry valuation levels and trends, changes in foreign exchange and interest rates, and other factors. If the portfolio managers incorrectly forecast these and other factors, the Fund’s performance could suffer. Derivatives are also subject to liquidity risk and the risk that the counterparty to a derivative transaction may fail to fulfill its contractual obligations under the derivative contract. In addition, given their complexity, derivatives are subject to the risk that improper or misunderstood documentation may expose the Fund to losses. |
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| Prospectus Summary | Lord Abbett High Yield Fund | · High Portfolio Turnover Risk | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Risk [Text Block] | oef_RiskTextBlock | · High Portfolio Turnover Risk: High portfolio turnover may result in increased transaction costs, reduced investment performance, and higher taxes resulting from increased realized capital gains, including short-term capital gains taxable as ordinary income when distributed to shareholders. |
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| Prospectus Summary | Lord Abbett High Yield Fund | ICE BofA U.S. High Yield Constrained Index | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Average Annual Return, Label [Optional Text] | oef_AverageAnnualReturnLabel | ICE BofA U.S. High Yield Constrained Index | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 8.59% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 4.56% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 6.47% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 5.15% | ||||||||||
| Performance Inception Date | oef_PerfInceptionDate | Apr. 04, 2017 | ||||||||||
| Prospectus Summary | Lord Abbett High Yield Fund | Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Average Annual Return, Label [Optional Text] | oef_AverageAnnualReturnLabel | Bloomberg U.S. Aggregate Bond Index | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 7.30% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | (0.36%) | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 2.01% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 1.87% | ||||||||||
| Performance Inception Date | oef_PerfInceptionDate | Apr. 04, 2017 | ||||||||||
| Prospectus Summary | Lord Abbett High Yield Fund | Class A Shares | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) | oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | 2.25% | [1] | |||||||||
| Maximum Deferred Sales Charge (as a percentage of Offering Price) | oef_MaximumDeferredSalesChargeOverOfferingPrice | 0.00% | [1],[2] | |||||||||
| Management Fees (as a percentage of Assets) | oef_ManagementFeesOverAssets | 0.54% | ||||||||||
| Distribution and Service (12b-1) Fees | oef_DistributionAndService12b1FeesOverAssets | 0.20% | ||||||||||
| Other Expenses (as a percentage of Assets): | oef_OtherExpensesOverAssets | 0.19% | ||||||||||
| Expenses (as a percentage of Assets) | oef_ExpensesOverAssets | 0.93% | ||||||||||
| Expense Example, with Redemption, 1 Year | oef_ExpenseExampleYear01 | $ 318 | ||||||||||
| Expense Example, with Redemption, 3 Years | oef_ExpenseExampleYear03 | 515 | ||||||||||
| Expense Example, with Redemption, 5 Years | oef_ExpenseExampleYear05 | 728 | ||||||||||
| Expense Example, with Redemption, 10 Years | oef_ExpenseExampleYear10 | 1,342 | ||||||||||
| Expense Example, No Redemption, 1 Year | oef_ExpenseExampleNoRedemptionYear01 | 318 | ||||||||||
| Expense Example, No Redemption, 3 Years | oef_ExpenseExampleNoRedemptionYear03 | 515 | ||||||||||
| Expense Example, No Redemption, 5 Years | oef_ExpenseExampleNoRedemptionYear05 | 728 | ||||||||||
| Expense Example, No Redemption, 10 Years | oef_ExpenseExampleNoRedemptionYear10 | $ 1,342 | ||||||||||
| Highest Quarterly Return, Label [Optional Text] | oef_HighestQuarterlyReturnLabel | Best Quarter | ||||||||||
| Highest Quarterly Return, Date | oef_BarChartHighestQuarterlyReturnDate | Jun. 30, 2020 | ||||||||||
| Highest Quarterly Return | oef_BarChartHighestQuarterlyReturn | 10.72% | ||||||||||
| Lowest Quarterly Return, Label [Optional Text] | oef_LowestQuarterlyReturnLabel | Worst Quarter | ||||||||||
| Lowest Quarterly Return, Date | oef_BarChartLowestQuarterlyReturnDate | Mar. 31, 2020 | ||||||||||
| Lowest Quarterly Return | oef_BarChartLowestQuarterlyReturn | (16.65%) | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 4.93% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 2.85% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 5.13% | ||||||||||
| Annual Return [Percent] | oef_AnnlRtrPct | 15.84% | ||||||||||
| Annual Return [Percent] | oef_AnnlRtrPct | 8.50% | ||||||||||
| Annual Return [Percent] | oef_AnnlRtrPct | (5.15%) | ||||||||||
| Annual Return [Percent] | oef_AnnlRtrPct | 15.07% | ||||||||||
| Annual Return [Percent] | oef_AnnlRtrPct | 4.49% | ||||||||||
| Annual Return [Percent] | oef_AnnlRtrPct | 6.15% | ||||||||||
| Annual Return [Percent] | oef_AnnlRtrPct | (13.75%) | ||||||||||
| Annual Return [Percent] | oef_AnnlRtrPct | 10.46% | ||||||||||
| Annual Return [Percent] | oef_AnnlRtrPct | 8.39% | ||||||||||
| Annual Return [Percent] | oef_AnnlRtrPct | 7.40% | ||||||||||
| Prospectus Summary | Lord Abbett High Yield Fund | Class A Shares | After Taxes on Distributions | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 1.92% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 0.46% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 2.67% | ||||||||||
| Prospectus Summary | Lord Abbett High Yield Fund | Class A Shares | After Taxes on Distributions and Sales | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 2.85% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 1.20% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 2.89% | ||||||||||
| Prospectus Summary | Lord Abbett High Yield Fund | Class C Shares | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) | oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | 0.00% | [1] | |||||||||
| Maximum Deferred Sales Charge (as a percentage of Offering Price) | oef_MaximumDeferredSalesChargeOverOfferingPrice | 1.00% | [1],[3] | |||||||||
| Management Fees (as a percentage of Assets) | oef_ManagementFeesOverAssets | 0.54% | ||||||||||
| Distribution and Service (12b-1) Fees | oef_DistributionAndService12b1FeesOverAssets | 0.83% | [4] | |||||||||
| Other Expenses (as a percentage of Assets): | oef_OtherExpensesOverAssets | 0.19% | ||||||||||
| Expenses (as a percentage of Assets) | oef_ExpensesOverAssets | 1.56% | ||||||||||
| Expense Example, with Redemption, 1 Year | oef_ExpenseExampleYear01 | $ 259 | ||||||||||
| Expense Example, with Redemption, 3 Years | oef_ExpenseExampleYear03 | 493 | ||||||||||
| Expense Example, with Redemption, 5 Years | oef_ExpenseExampleYear05 | 850 | ||||||||||
| Expense Example, with Redemption, 10 Years | oef_ExpenseExampleYear10 | 1,687 | ||||||||||
| Expense Example, No Redemption, 1 Year | oef_ExpenseExampleNoRedemptionYear01 | 159 | ||||||||||
| Expense Example, No Redemption, 3 Years | oef_ExpenseExampleNoRedemptionYear03 | 493 | ||||||||||
| Expense Example, No Redemption, 5 Years | oef_ExpenseExampleNoRedemptionYear05 | 850 | ||||||||||
| Expense Example, No Redemption, 10 Years | oef_ExpenseExampleNoRedemptionYear10 | $ 1,687 | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 5.56% | [5] | |||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 2.66% | [5] | |||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 4.71% | [5] | |||||||||
| Prospectus Summary | Lord Abbett High Yield Fund | Class F Shares | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) | oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | 0.00% | [1] | |||||||||
| Maximum Deferred Sales Charge (as a percentage of Offering Price) | oef_MaximumDeferredSalesChargeOverOfferingPrice | 0.00% | [1] | |||||||||
| Management Fees (as a percentage of Assets) | oef_ManagementFeesOverAssets | 0.54% | ||||||||||
| Distribution and Service (12b-1) Fees | oef_DistributionAndService12b1FeesOverAssets | 0.10% | ||||||||||
| Other Expenses (as a percentage of Assets): | oef_OtherExpensesOverAssets | 0.19% | ||||||||||
| Expenses (as a percentage of Assets) | oef_ExpensesOverAssets | 0.83% | ||||||||||
| Expense Example, with Redemption, 1 Year | oef_ExpenseExampleYear01 | $ 85 | ||||||||||
| Expense Example, with Redemption, 3 Years | oef_ExpenseExampleYear03 | 265 | ||||||||||
| Expense Example, with Redemption, 5 Years | oef_ExpenseExampleYear05 | 460 | ||||||||||
| Expense Example, with Redemption, 10 Years | oef_ExpenseExampleYear10 | 1,025 | ||||||||||
| Expense Example, No Redemption, 1 Year | oef_ExpenseExampleNoRedemptionYear01 | 85 | ||||||||||
| Expense Example, No Redemption, 3 Years | oef_ExpenseExampleNoRedemptionYear03 | 265 | ||||||||||
| Expense Example, No Redemption, 5 Years | oef_ExpenseExampleNoRedemptionYear05 | 460 | ||||||||||
| Expense Example, No Redemption, 10 Years | oef_ExpenseExampleNoRedemptionYear10 | $ 1,025 | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 7.50% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 3.42% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 5.47% | ||||||||||
| Prospectus Summary | Lord Abbett High Yield Fund | Class F3 Shares | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) | oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | 0.00% | [1] | |||||||||
| Maximum Deferred Sales Charge (as a percentage of Offering Price) | oef_MaximumDeferredSalesChargeOverOfferingPrice | 0.00% | [1] | |||||||||
| Management Fees (as a percentage of Assets) | oef_ManagementFeesOverAssets | 0.54% | ||||||||||
| Distribution and Service (12b-1) Fees | oef_DistributionAndService12b1FeesOverAssets | 0.00% | ||||||||||
| Other Expenses (as a percentage of Assets): | oef_OtherExpensesOverAssets | 0.09% | ||||||||||
| Expenses (as a percentage of Assets) | oef_ExpensesOverAssets | 0.63% | ||||||||||
| Expense Example, with Redemption, 1 Year | oef_ExpenseExampleYear01 | $ 64 | ||||||||||
| Expense Example, with Redemption, 3 Years | oef_ExpenseExampleYear03 | 202 | ||||||||||
| Expense Example, with Redemption, 5 Years | oef_ExpenseExampleYear05 | 351 | ||||||||||
| Expense Example, with Redemption, 10 Years | oef_ExpenseExampleYear10 | 786 | ||||||||||
| Expense Example, No Redemption, 1 Year | oef_ExpenseExampleNoRedemptionYear01 | 64 | ||||||||||
| Expense Example, No Redemption, 3 Years | oef_ExpenseExampleNoRedemptionYear03 | 202 | ||||||||||
| Expense Example, No Redemption, 5 Years | oef_ExpenseExampleNoRedemptionYear05 | 351 | ||||||||||
| Expense Example, No Redemption, 10 Years | oef_ExpenseExampleNoRedemptionYear10 | $ 786 | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 7.72% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 3.64% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 4.36% | ||||||||||
| Performance Inception Date | oef_PerfInceptionDate | Apr. 04, 2017 | ||||||||||
| Prospectus Summary | Lord Abbett High Yield Fund | Class I Shares | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) | oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | 0.00% | [1] | |||||||||
| Maximum Deferred Sales Charge (as a percentage of Offering Price) | oef_MaximumDeferredSalesChargeOverOfferingPrice | 0.00% | [1] | |||||||||
| Management Fees (as a percentage of Assets) | oef_ManagementFeesOverAssets | 0.54% | ||||||||||
| Distribution and Service (12b-1) Fees | oef_DistributionAndService12b1FeesOverAssets | 0.00% | ||||||||||
| Other Expenses (as a percentage of Assets): | oef_OtherExpensesOverAssets | 0.19% | ||||||||||
| Expenses (as a percentage of Assets) | oef_ExpensesOverAssets | 0.73% | ||||||||||
| Expense Example, with Redemption, 1 Year | oef_ExpenseExampleYear01 | $ 75 | ||||||||||
| Expense Example, with Redemption, 3 Years | oef_ExpenseExampleYear03 | 233 | ||||||||||
| Expense Example, with Redemption, 5 Years | oef_ExpenseExampleYear05 | 406 | ||||||||||
| Expense Example, with Redemption, 10 Years | oef_ExpenseExampleYear10 | 906 | ||||||||||
| Expense Example, No Redemption, 1 Year | oef_ExpenseExampleNoRedemptionYear01 | 75 | ||||||||||
| Expense Example, No Redemption, 3 Years | oef_ExpenseExampleNoRedemptionYear03 | 233 | ||||||||||
| Expense Example, No Redemption, 5 Years | oef_ExpenseExampleNoRedemptionYear05 | 406 | ||||||||||
| Expense Example, No Redemption, 10 Years | oef_ExpenseExampleNoRedemptionYear10 | $ 906 | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 7.61% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 3.54% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 5.58% | ||||||||||
| Prospectus Summary | Lord Abbett High Yield Fund | Class P Shares | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) | oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | 0.00% | [1] | |||||||||
| Maximum Deferred Sales Charge (as a percentage of Offering Price) | oef_MaximumDeferredSalesChargeOverOfferingPrice | 0.00% | [1] | |||||||||
| Management Fees (as a percentage of Assets) | oef_ManagementFeesOverAssets | 0.54% | ||||||||||
| Distribution and Service (12b-1) Fees | oef_DistributionAndService12b1FeesOverAssets | 0.45% | ||||||||||
| Other Expenses (as a percentage of Assets): | oef_OtherExpensesOverAssets | 0.19% | ||||||||||
| Expenses (as a percentage of Assets) | oef_ExpensesOverAssets | 1.18% | ||||||||||
| Expense Example, with Redemption, 1 Year | oef_ExpenseExampleYear01 | $ 120 | ||||||||||
| Expense Example, with Redemption, 3 Years | oef_ExpenseExampleYear03 | 375 | ||||||||||
| Expense Example, with Redemption, 5 Years | oef_ExpenseExampleYear05 | 649 | ||||||||||
| Expense Example, with Redemption, 10 Years | oef_ExpenseExampleYear10 | 1,432 | ||||||||||
| Expense Example, No Redemption, 1 Year | oef_ExpenseExampleNoRedemptionYear01 | 120 | ||||||||||
| Expense Example, No Redemption, 3 Years | oef_ExpenseExampleNoRedemptionYear03 | 375 | ||||||||||
| Expense Example, No Redemption, 5 Years | oef_ExpenseExampleNoRedemptionYear05 | 649 | ||||||||||
| Expense Example, No Redemption, 10 Years | oef_ExpenseExampleNoRedemptionYear10 | $ 1,432 | ||||||||||
| Prospectus Summary | Lord Abbett High Yield Fund | Class R2 Shares | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) | oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | 0.00% | [1] | |||||||||
| Maximum Deferred Sales Charge (as a percentage of Offering Price) | oef_MaximumDeferredSalesChargeOverOfferingPrice | 0.00% | [1] | |||||||||
| Management Fees (as a percentage of Assets) | oef_ManagementFeesOverAssets | 0.54% | ||||||||||
| Distribution and Service (12b-1) Fees | oef_DistributionAndService12b1FeesOverAssets | 0.60% | ||||||||||
| Other Expenses (as a percentage of Assets): | oef_OtherExpensesOverAssets | 0.19% | ||||||||||
| Expenses (as a percentage of Assets) | oef_ExpensesOverAssets | 1.33% | ||||||||||
| Expense Example, with Redemption, 1 Year | oef_ExpenseExampleYear01 | $ 135 | ||||||||||
| Expense Example, with Redemption, 3 Years | oef_ExpenseExampleYear03 | 421 | ||||||||||
| Expense Example, with Redemption, 5 Years | oef_ExpenseExampleYear05 | 729 | ||||||||||
| Expense Example, with Redemption, 10 Years | oef_ExpenseExampleYear10 | 1,601 | ||||||||||
| Expense Example, No Redemption, 1 Year | oef_ExpenseExampleNoRedemptionYear01 | 135 | ||||||||||
| Expense Example, No Redemption, 3 Years | oef_ExpenseExampleNoRedemptionYear03 | 421 | ||||||||||
| Expense Example, No Redemption, 5 Years | oef_ExpenseExampleNoRedemptionYear05 | 729 | ||||||||||
| Expense Example, No Redemption, 10 Years | oef_ExpenseExampleNoRedemptionYear10 | $ 1,601 | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 6.97% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 2.93% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 4.96% | ||||||||||
| Prospectus Summary | Lord Abbett High Yield Fund | Class R3 Shares | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) | oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | 0.00% | [1] | |||||||||
| Maximum Deferred Sales Charge (as a percentage of Offering Price) | oef_MaximumDeferredSalesChargeOverOfferingPrice | 0.00% | [1] | |||||||||
| Management Fees (as a percentage of Assets) | oef_ManagementFeesOverAssets | 0.54% | ||||||||||
| Distribution and Service (12b-1) Fees | oef_DistributionAndService12b1FeesOverAssets | 0.50% | ||||||||||
| Other Expenses (as a percentage of Assets): | oef_OtherExpensesOverAssets | 0.19% | ||||||||||
| Expenses (as a percentage of Assets) | oef_ExpensesOverAssets | 1.23% | ||||||||||
| Expense Example, with Redemption, 1 Year | oef_ExpenseExampleYear01 | $ 125 | ||||||||||
| Expense Example, with Redemption, 3 Years | oef_ExpenseExampleYear03 | 390 | ||||||||||
| Expense Example, with Redemption, 5 Years | oef_ExpenseExampleYear05 | 676 | ||||||||||
| Expense Example, with Redemption, 10 Years | oef_ExpenseExampleYear10 | 1,489 | ||||||||||
| Expense Example, No Redemption, 1 Year | oef_ExpenseExampleNoRedemptionYear01 | 125 | ||||||||||
| Expense Example, No Redemption, 3 Years | oef_ExpenseExampleNoRedemptionYear03 | 390 | ||||||||||
| Expense Example, No Redemption, 5 Years | oef_ExpenseExampleNoRedemptionYear05 | 676 | ||||||||||
| Expense Example, No Redemption, 10 Years | oef_ExpenseExampleNoRedemptionYear10 | $ 1,489 | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 6.91% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 3.00% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 5.05% | ||||||||||
| Prospectus Summary | Lord Abbett High Yield Fund | Class R4 Shares | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) | oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | 0.00% | [1] | |||||||||
| Maximum Deferred Sales Charge (as a percentage of Offering Price) | oef_MaximumDeferredSalesChargeOverOfferingPrice | 0.00% | [1] | |||||||||
| Management Fees (as a percentage of Assets) | oef_ManagementFeesOverAssets | 0.54% | ||||||||||
| Distribution and Service (12b-1) Fees | oef_DistributionAndService12b1FeesOverAssets | 0.25% | ||||||||||
| Other Expenses (as a percentage of Assets): | oef_OtherExpensesOverAssets | 0.19% | ||||||||||
| Expenses (as a percentage of Assets) | oef_ExpensesOverAssets | 0.98% | ||||||||||
| Expense Example, with Redemption, 1 Year | oef_ExpenseExampleYear01 | $ 100 | ||||||||||
| Expense Example, with Redemption, 3 Years | oef_ExpenseExampleYear03 | 312 | ||||||||||
| Expense Example, with Redemption, 5 Years | oef_ExpenseExampleYear05 | 542 | ||||||||||
| Expense Example, with Redemption, 10 Years | oef_ExpenseExampleYear10 | 1,201 | ||||||||||
| Expense Example, No Redemption, 1 Year | oef_ExpenseExampleNoRedemptionYear01 | 100 | ||||||||||
| Expense Example, No Redemption, 3 Years | oef_ExpenseExampleNoRedemptionYear03 | 312 | ||||||||||
| Expense Example, No Redemption, 5 Years | oef_ExpenseExampleNoRedemptionYear05 | 542 | ||||||||||
| Expense Example, No Redemption, 10 Years | oef_ExpenseExampleNoRedemptionYear10 | $ 1,201 | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 7.35% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 3.27% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 5.33% | ||||||||||
| Prospectus Summary | Lord Abbett High Yield Fund | Class R5 Shares | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) | oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | 0.00% | [1] | |||||||||
| Maximum Deferred Sales Charge (as a percentage of Offering Price) | oef_MaximumDeferredSalesChargeOverOfferingPrice | 0.00% | [1] | |||||||||
| Management Fees (as a percentage of Assets) | oef_ManagementFeesOverAssets | 0.54% | ||||||||||
| Distribution and Service (12b-1) Fees | oef_DistributionAndService12b1FeesOverAssets | 0.00% | ||||||||||
| Other Expenses (as a percentage of Assets): | oef_OtherExpensesOverAssets | 0.19% | ||||||||||
| Expenses (as a percentage of Assets) | oef_ExpensesOverAssets | 0.73% | ||||||||||
| Expense Example, with Redemption, 1 Year | oef_ExpenseExampleYear01 | $ 75 | ||||||||||
| Expense Example, with Redemption, 3 Years | oef_ExpenseExampleYear03 | 233 | ||||||||||
| Expense Example, with Redemption, 5 Years | oef_ExpenseExampleYear05 | 406 | ||||||||||
| Expense Example, with Redemption, 10 Years | oef_ExpenseExampleYear10 | 906 | ||||||||||
| Expense Example, No Redemption, 1 Year | oef_ExpenseExampleNoRedemptionYear01 | 75 | ||||||||||
| Expense Example, No Redemption, 3 Years | oef_ExpenseExampleNoRedemptionYear03 | 233 | ||||||||||
| Expense Example, No Redemption, 5 Years | oef_ExpenseExampleNoRedemptionYear05 | 406 | ||||||||||
| Expense Example, No Redemption, 10 Years | oef_ExpenseExampleNoRedemptionYear10 | $ 906 | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 7.44% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 3.51% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 5.57% | ||||||||||
| Prospectus Summary | Lord Abbett High Yield Fund | Class R6 Shares | ||||||||||||
| Risk/Return: | oef_RiskReturnAbstract | |||||||||||
| Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) | oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | 0.00% | [1] | |||||||||
| Maximum Deferred Sales Charge (as a percentage of Offering Price) | oef_MaximumDeferredSalesChargeOverOfferingPrice | 0.00% | [1] | |||||||||
| Management Fees (as a percentage of Assets) | oef_ManagementFeesOverAssets | 0.54% | ||||||||||
| Distribution and Service (12b-1) Fees | oef_DistributionAndService12b1FeesOverAssets | 0.00% | ||||||||||
| Other Expenses (as a percentage of Assets): | oef_OtherExpensesOverAssets | 0.09% | ||||||||||
| Expenses (as a percentage of Assets) | oef_ExpensesOverAssets | 0.63% | ||||||||||
| Expense Example, with Redemption, 1 Year | oef_ExpenseExampleYear01 | $ 64 | ||||||||||
| Expense Example, with Redemption, 3 Years | oef_ExpenseExampleYear03 | 202 | ||||||||||
| Expense Example, with Redemption, 5 Years | oef_ExpenseExampleYear05 | 351 | ||||||||||
| Expense Example, with Redemption, 10 Years | oef_ExpenseExampleYear10 | 786 | ||||||||||
| Expense Example, No Redemption, 1 Year | oef_ExpenseExampleNoRedemptionYear01 | 64 | ||||||||||
| Expense Example, No Redemption, 3 Years | oef_ExpenseExampleNoRedemptionYear03 | 202 | ||||||||||
| Expense Example, No Redemption, 5 Years | oef_ExpenseExampleNoRedemptionYear05 | 351 | ||||||||||
| Expense Example, No Redemption, 10 Years | oef_ExpenseExampleNoRedemptionYear10 | $ 786 | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 7.55% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 3.61% | ||||||||||
| Average Annual Return, Percent | oef_AvgAnnlRtrPct | 5.69% | ||||||||||
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