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Lord Abbett Short Duration Core Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Lord Abbett Short Duration Core Bond Fund
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Fund’s investment objective is to seek current income consistent with preservation of capital.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. 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 professional and in “Sales Charge Reductions and Waivers” on page 421 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”).
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Mar. 31, 2020
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 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 177% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 177.00%
Expense Breakpoint Discounts [Text] rr_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] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent These amounts have been updated from fiscal year amounts to reflect current fees and expenses.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_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, giving effect to the fee waiver and expense reimbursement arrangement described above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption If Shares Are Redeemed
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption If Shares Are Not Redeemed
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_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 various types of short duration debt (or fixed income) securities and derivative instruments that are intended to provide economic exposure to such securities. Under normal conditions, the Fund invests substantially all of its assets in debt securities rated investment grade at the time of purchase or determined by Lord Abbett to be of comparable quality. However, the Fund may at times hold below investment grade securities (commonly referred to as “high-yield” or “junk” bonds) if the Fund purchased securities that were considered investment grade at their time of purchase and such securities subsequently are downgraded. The Fund may invest in:


 

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Corporate debt securities of U.S. issuers;

 

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Corporate debt securities of non-U.S. (including emerging market) issuers that are denominated in U.S. dollars;

 

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Mortgage-backed, mortgage-related and other asset-backed securities, including privately issued mortgage-related securities and commercial mortgage-backed securities;


 

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Securities issued or guaranteed by the U.S. Government, its agencies or instrumentalities;

 

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Debt securities issued or guaranteed by non-U.S. sovereign governments and their agencies, authorities, political subdivisions, or instrumentalities;

 

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Senior loans, including bridge loans, novations, assignments, and participations; and

 

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Structured securities and other hybrid instruments, including collateralized loan obligations (“CLOs”).


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 or its agencies and instrumentalities. The Fund may invest up to 15% of its net assets in securities that are illiquid at the time of investment.


The Fund attempts to manage interest rate risk through its management of the average duration of the securities it holds in its portfolio. Under normal conditions, the Fund will maintain its average dollar-weighted duration range between one and three years. Subject to the foregoing, the Fund does not have any maturity or duration restrictions and may invest in securities of any maturity or duration. The duration of a security takes into account the pattern of all expected payments of interest and principal on the security over time, including how these payments are affected by changes in interest rates. The longer a portfolio’s duration, the more sensitive it is to interest rate risk. The shorter a portfolio’s duration, the less sensitive it is to interest rate risk. Because the Fund primarily invests in short duration bonds, it should be less sensitive to interest rate changes than a fund that focuses on longer duration bonds.


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 market value of derivatives providing economic exposure substantially similar to the securities referenced in the Fund’s 80% policy, as described above, will be counted for purposes of measuring the Fund’s compliance with its 80% policy.


The Fund buys and sells securities using a relative value-oriented investment process, meaning the Fund generally seeks more investment exposure to securities believed to be undervalued and less investment exposure to securities believed to be overvalued. The Fund combines top-down and bottom-up analysis to construct its portfolio. The Fund uses a blend of fundamental research and quantitative tools to evaluate global economic conditions, opportunities, and risks across different segments of the fixed income market. The Fund may actively rotate sector exposure based on its assessment of relative value. The Fund may engage 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, shows signs of deteriorating fundamentals, or has reached its valuation target, among other reasons. The Fund seeks to remain fully invested in accordance with its investment objective. The Fund may, however, deviate entirely 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.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

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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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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Market Risk: The market values of securities will fluctuate, sometimes sharply and unpredictably, based on overall economic conditions, governmental actions or intervention, political developments and other factors. Although prices of debt securities tend to rise and fall less dramatically than those of equity securities, they may experience heightened volatility.

 

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New Fund Risk: The Fund is recently organized. There can be no assurance that the Fund will reach or maintain a sufficient asset size to effectively implement its investment strategy. In addition, the Fund’s gross expense ratio may fluctuate during its initial operating period because of the Fund’s relatively smaller asset size and, until the Fund achieves sufficient scale, a Fund shareholder may experience proportionally higher Fund expenses than would be experienced by shareholders of a fund with a larger asset base.

 

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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. Typically, shorter-term bonds are less volatile than longer-term bonds; however, longer-term bonds typically offer higher yields and more stable interest income than shorter-term bond investments. 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 than higher rated securities. In addition, as interest rates rise, the Fund’s investments typically will lose value.

 

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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 bonds 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. Below investment grade securities have a higher risk of default than investment grade securities, and their prices are much more volatile. Issuers of below investment grade securities generally are not as strong financially as those issuers with higher credit ratings, and are more likely to encounter financial difficulties, especially during periods of rising interest rates or other unfavorable economic or market conditions. Below investment grade securities are subject to the increased risk of an issuer’s inability to meet principal and interest obligations and a greater risk of default.

 

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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 the fixed income markets. Interest rate changes typically have a greater effect on the price of longer-term bonds, including inverse floaters, than on the price of shorter-term bonds. 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. The Fund will be exposed to heightened interest rate risk as interest rates rise from historically low levels.

 

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Liquidity/Redemption Risk: It may be difficult for the Fund to sell certain securities, including below investment grade securities, in a timely manner and at their stated value, which could result in losses to the Fund. In addition, 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 unable to sell illiquid securities at its desired time or price. As noted, the market for below investment grade securities generally is less liquid than the market for higher rated securities, subjecting them to greater price fluctuations. The purchase price and subsequent valuation of illiquid securities normally reflect a discount, which may be significant, from the market price of comparable securities for which a liquid market exists. Illiquidity can be caused by a variety of factors, including economic conditions, events relating to the issuer, a drop in overall market trading volume, an inability to find a ready buyer, or legal restrictions on the securities’ resale. Certain securities that are liquid when purchased may later become illiquid, particularly in times of overall economic distress. Liquidity risk may be magnified in a rising interest rate environment or other circumstances where investor redemptions from fixed income mutual funds may be higher than normal, causing increased supply in the market due to selling activity.

 

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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”)). 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.

 

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Mortgage-Related and Other Asset-Backed Securities Risk: Mortgage-related securities, including commercial mortgage-backed securities and other privately issued mortgage-related securities, and other asset-backed securities may be particularly sensitive to changes in economic conditions, including delinquencies and/or defaults. The prices of mortgage- and 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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Commercial Mortgage-Backed Securities Risk: Commercial mortgage-backed securities include securities that reflect an interest in, and are secured by, mortgage loans on commercial real property. Many of the risks of investing in commercial mortgage-backed securities reflect the risks of investing in the real estate securing the underlying mortgage loans. These risks reflect the effects of local and other economic conditions on real estate markets, the ability of tenants to make loan payments, and the ability of a property to attract and retain tenants. Commercial mortgage-backed securities may be less liquid and exhibit greater price volatility than other types of mortgage- or asset-backed securities.

 

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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 that can increase the likelihood that the Fund will lose money. For example, as compared with companies organized and operated in the U.S., 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. In addition, the securities of foreign companies also may be subject to inadequate exchange control regulations, the imposition of economic sanctions or other government restrictions, higher transaction and other costs, reduced liquidity, and delays in settlement to the extent they are traded on non-U.S. exchanges or markets. Foreign securities also may subject the Fund’s investments to changes in currency 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 generally riskier than investments in more developed markets because such markets tend to develop unevenly and may never fully develop.

 

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Sovereign Debt Risk: Sovereign debt securities are subject to the risk that the relevant sovereign government or governmental entity may delay or refuse to pay interest or repay principal on its debt, due, for example, to cash flow problems, insufficient foreign currency reserves, political considerations, the size of its debt relative to the economy, or the failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies. If a sovereign government or governmental entity defaults, it may ask for maturity extensions, interest rate reductions, or additional loans. There is no legal process for collecting sovereign debt that is not repaid, nor are there bankruptcy proceedings through which all or part of the unpaid sovereign debt may be collected.

 

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Senior Loan Risk: Investments in floating or adjustable rate senior loans are subject to increased credit and liquidity risks. Senior loan prices also may be adversely affected by supply-demand imbalances caused by conditions in the senior loan market or related markets. Below investment grade senior 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. Senior loans may be subject to structural subordination and, although the loans may be senior to equity and other debt securities in the borrower’s capital structure, the loans may be subordinated to other obligations of the borrower or its subsidiaries.

 

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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. The risks associated with derivatives include, among other things, the following:


 

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The risk that the value of a derivative may not correlate with the value of the underlying asset, rate, or index in the manner anticipated by the portfolio management team and may be more sensitive to changes in economic or market conditions than anticipated.

 

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Derivatives may be difficult to value, especially under stressed or unforeseen market conditions.

 

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The risk that the counterparty may fail to fulfill its contractual obligations under the derivative contract. Central clearing of derivatives is intended to decrease counterparty risk but does not eliminate it.

 

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The Fund may be required to segregate permissible liquid assets to cover its obligations under these transactions and may have to liquidate positions before it is desirable to do so to fulfill its segregation requirements.

 

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The risk that there will not be a liquid secondary trading market for the derivative, or that the Fund will otherwise be unable to sell or otherwise close a derivatives position when desired, exposing the Fund to additional losses.

 

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Because derivatives generally involve a small initial investment relative to the risk assumed (known as leverage), derivatives can magnify the Fund’s losses and increase its volatility.

 

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The Fund’s use of derivatives may affect the amount, timing, and character of distributions, and may cause the Fund to realize more short-term capital gain and ordinary income than if the Fund did not use derivatives.


     

Derivatives may not perform as expected and the Fund may not realize the intended benefits. Whether the Fund’s use of derivatives is successful will depend on, among other things, the portfolio managers’ ability to correctly forecast market movements and other factors. If the portfolio managers incorrectly forecast these and other factors, the Fund’s performance could suffer. 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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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 to shareholders when distributed.


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. For more information on the principal risks of the Fund, please see the “More Information About the Funds – Principal Risks” section in the prospectus.
Risk Lose Money [Text] rr_RiskLoseMoney 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.
RIsk Not Insured [Text] rr_RiskNotInsured 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PERFORMANCE
Performance Narrative [Text Block] rr_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.
Performance Information Illustrates Variability of Returns [Text] rr_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] rr_PerformanceAvailabilityPhone 888-522-2388
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.lordabbett.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 Bar Chart (per calendar year) — Class A Shares
Bar Chart Narrative [Text Block] rr_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.
Bar Chart Does Not Reflect Sales Loads [Text] rr_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] rr_BarChartClosingTextBlock

 

 

 

Best Period 4th Q ’18 +0.72%

  

Worst Period 1st Q ’18 -0.12%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2018
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.72%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (0.12%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the periods ended December 31, 2018)
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The Fund’s average annual total returns include applicable sales charges.
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Performance Table Uses Highest Federal Rate rr_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 rr_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] rr_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 rr_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 rr_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. 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.
Lord Abbett Short Duration Core Bond Fund | Bloomberg Barclays 1-3 Year U.S. Government/Credit Bond Index (reflects no deduction for fees, expenses, or taxes) 4/19/2017  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.60%
Life of Class rr_AverageAnnualReturnSinceInception 1.04%
Inception Date for Performance rr_AverageAnnualReturnInceptionDate Apr. 19, 2017
Lord Abbett Short Duration Core Bond Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.25% [1]
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1],[2]
Management Fees rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.20%
Other Expenses rr_OtherExpensesOverAssets 2.61%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 3.11%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.51%) [3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.60% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 285
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 932
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,603
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,396
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 285
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 932
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,603
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,396
Annual Return 2018 rr_AnnualReturn2018 1.50%
1 Year rr_AverageAnnualReturnYear01 (0.78%)
Life of Class rr_AverageAnnualReturnSinceInception (0.04%)
Inception Date for Performance rr_AverageAnnualReturnInceptionDate Apr. 19, 2017
Lord Abbett Short Duration Core Bond Fund | Class A | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.04%)
Life of Class rr_AverageAnnualReturnSinceInception (1.22%)
Lord Abbett Short Duration Core Bond Fund | Class A | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (0.47%)
Life of Class rr_AverageAnnualReturnSinceInception (0.54%)
Lord Abbett Short Duration Core Bond Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [1]
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00% [1],[4]
Management Fees rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.99% [5]
Other Expenses rr_OtherExpensesOverAssets 2.61%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 3.90%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.51%) [3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.39% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 242
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 959
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,794
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,963
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 142
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 959
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,794
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,963
1 Year rr_AverageAnnualReturnYear01 (0.25%)
Life of Class rr_AverageAnnualReturnSinceInception 0.54%
Inception Date for Performance rr_AverageAnnualReturnInceptionDate Apr. 19, 2017
Lord Abbett Short Duration Core Bond Fund | Class F  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [1]
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management Fees rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses rr_OtherExpensesOverAssets 2.61%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 3.01%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.51%) [3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.50% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 51
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 693
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,360
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,149
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 51
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 693
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,360
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,149
1 Year rr_AverageAnnualReturnYear01 1.60%
Life of Class rr_AverageAnnualReturnSinceInception 1.41%
Inception Date for Performance rr_AverageAnnualReturnInceptionDate Apr. 19, 2017
Lord Abbett Short Duration Core Bond Fund | Class F3  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [1]
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management Fees rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 2.59%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.89%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.51%) [3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.38% [3],[6]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 39
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 656
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,300
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,033
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 39
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 656
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,300
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,033
1 Year rr_AverageAnnualReturnYear01 1.80%
Life of Class rr_AverageAnnualReturnSinceInception 1.61%
Inception Date for Performance rr_AverageAnnualReturnInceptionDate Apr. 19, 2017
Lord Abbett Short Duration Core Bond Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [1]
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management Fees rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 2.61%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.91% [6]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.51%) [3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.40% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 41
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 662
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,310
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,052
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 41
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 662
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,310
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,052
1 Year rr_AverageAnnualReturnYear01 1.59%
Life of Class rr_AverageAnnualReturnSinceInception 1.45%
Inception Date for Performance rr_AverageAnnualReturnInceptionDate Apr. 19, 2017
Lord Abbett Short Duration Core Bond Fund | Class R2  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [1]
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management Fees rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.60%
Other Expenses rr_OtherExpensesOverAssets 2.61%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 3.51% [6]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.51%) [3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.00% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 843
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,606
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,616
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 102
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 843
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,606
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,616
1 Year rr_AverageAnnualReturnYear01 1.11%
Life of Class rr_AverageAnnualReturnSinceInception 0.92%
Inception Date for Performance rr_AverageAnnualReturnInceptionDate Apr. 19, 2017
Lord Abbett Short Duration Core Bond Fund | Class R3  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [1]
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management Fees rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses rr_OtherExpensesOverAssets 2.61%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 3.41%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.51%) [3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.90% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 92
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 813
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,558
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,525
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 92
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 813
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,558
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,525
1 Year rr_AverageAnnualReturnYear01 1.21%
Life of Class rr_AverageAnnualReturnSinceInception 1.02%
Inception Date for Performance rr_AverageAnnualReturnInceptionDate Apr. 19, 2017
Lord Abbett Short Duration Core Bond Fund | Class R4  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [1]
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management Fees rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 2.61%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 3.16% [6]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.51%) [3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.65% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 738
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,435
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,292
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 66
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 738
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,435
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,292
1 Year rr_AverageAnnualReturnYear01 1.46%
Life of Class rr_AverageAnnualReturnSinceInception 1.27%
Inception Date for Performance rr_AverageAnnualReturnInceptionDate Apr. 19, 2017
Lord Abbett Short Duration Core Bond Fund | Class R5  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [1]
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management Fees rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 2.61%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.91% [6]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.51%) [3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.40% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 41
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 662
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,310
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,052
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 41
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 662
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,310
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,052
1 Year rr_AverageAnnualReturnYear01 1.71%
Life of Class rr_AverageAnnualReturnSinceInception 1.52%
Inception Date for Performance rr_AverageAnnualReturnInceptionDate Apr. 19, 2017
Lord Abbett Short Duration Core Bond Fund | Class R6  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [1]
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management Fees rr_ManagementFeesOverAssets 0.30%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 2.59%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.89%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.51%) [3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.38% [3],[6]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 39
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 656
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,300
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,033
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 39
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 656
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,300
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,033
1 Year rr_AverageAnnualReturnYear01 1.80%
Life of Class rr_AverageAnnualReturnSinceInception 1.61%
Inception Date for Performance rr_AverageAnnualReturnInceptionDate Apr. 19, 2017
[1] A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction.
[2] A contingent deferred sales charge ("CDSC") of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month of the one-year anniversary of the purchase.
[3] For the period from April 1, 2019 through March 31, 2020, Lord, Abbett & Co. LLC has contractually agreed to waive its fees and reimburse expenses to the extent necessary to limit total net annual operating expenses, excluding any applicable 12b-1 fees, acquired fund fees and expenses, interest-related expenses, taxes, expenses related to litigation and potential litigation, and extraordinary expenses, to an annual rate of 0.38% for each of Class F3 and R6 and 0.40% for each other class. This agreement may be terminated only by the Fund's Board of Trustees.
[4] A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.
[5] The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund's average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund's average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate.
[6] These amounts have been updated from fiscal year amounts to reflect current fees and expenses.