485BPOS

Securities Act File No. 033-47641

Investment Company Act File No. 811-06650

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM N-1A
	REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933	x
	Pre-Effective Amendment No.	o
	Post-Effective Amendment No. 50	x
	and/or
	REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	x
	Amendment No. 49	x

LORD ABBETT RESEARCH FUND, INC.

Exact Name of Registrant as Specified in Charter

90 Hudson Street, Jersey City, New Jersey	07302-3973
(Address of Principal Executive Offices)	(Zip Code)

Registrant’s Telephone Number, including Area Code: (800) 201-6984

Thomas R. Phillips, Esq.

Vice President and Assistant Secretary

90 Hudson Street, Jersey City, New Jersey 07302-3973

(Name and Address of Agent for Service)

It is proposed that this filing will become effective (check appropriate box)
x	immediately upon filing pursuant to paragraph (b)
o	on (date) pursuant to paragraph (b)
o	60 days after filing pursuant to paragraph (a)(1)
o	on (date) pursuant to paragraph (a)(1)
o	75 days after filing pursuant to paragraph (a)(2)
o	on (date) pursuant to paragraph (a)(2) of Rule 485
If appropriate, check the following box:
o	this post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness to its Registration Statement under Rule 485(b) under the Securities Act and had duly caused this Post-Effective Amendment to its Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of Jersey City, and State of New Jersey as of the 17^th day of October, 2012.

LORD ABBETT RESEARCH FUND, INC.
BY:	/s/ Thomas R. Phillips
	Thomas R. Phillips
	Vice President and Assistant Secretary
BY:	/s/ Joan A. Binstock
	Joan A. Binstock
	Chief Financial Officer and Vice President

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

Signatures	Title	Date
Robert S. Dow*	Chairman, Chief Executive Officer	October 17, 2012
	and Director
Robert S. Dow
Daria L. Foster*	President and Director	October 17, 2012
Daria L. Foster
E. Thayer Bigelow*	Director	October 17, 2012
E. Thayer Bigelow
Robert B. Calhoun, Jr.*	Director	October 17, 2012
Robert B. Calhoun, Jr.
Evelyn E. Guernsey*	Director	October 17, 2012
Evelyn E. Guernsey
Julie A. Hill*	Director	October 17, 2012
Julie A. Hill
Franklin W. Hobbs*	Director	October 17, 2012
Franklin W. Hobbs
Thomas J. Neff*	Director	October 17, 2012
Thomas J. Neff
James L.L. Tullis*	Director	October 17, 2012
James L.L. Tullis

By:	/s/ Thomas R. Phillips
	Thomas R. Phillips
	Attorney – in – Fact*

POWER OF ATTORNEY

          Each person whose signature appears below on this Registration Statement hereby constitutes and appoints Lawrence H. Kaplan, Lawrence B. Stoller, John K. Forst, and Thomas R. Phillips, each of them, with full power to act without the other, his or her true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities (until revoked in writing) to sign any and all Registration Statements of each Fund enumerated on Exhibit A hereto for which such person serves as a Director/Trustee (including Registration Statements on Forms N-1A and N-14 and any amendments thereto), and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing ratifying and confirming all that said attorneys-in-fact and agents or any of them, or their or his or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

          Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

Signatures	Title	Date
/s/ Robert S. Dow	Chairman, CEO and Director/Trustee	April 19, 2012
Robert S. Dow
/s/ Daria L. Foster	President and Director/Trustee	April 19, 2012
Daria L. Foster
/s/ E. Thayer Bigelow	Director/Trustee	April 19, 2012
E. Thayer Bigelow
/s/ Robert B. Calhoun, Jr.	Director/Trustee	April 19, 2012
Robert B. Calhoun, Jr.
/s/ Evelyn E. Guernsey	Director/Trustee	April 19, 2012
Evelyn E. Guernsey
/s/ Julie A. Hill	Director/Trustee	April 19, 2012
Julie A. Hill
/s/ Franklin W. Hobbs	Director/Trustee	April 19, 2012
Franklin W. Hobbs
/s/ Thomas J. Neff	Director/Trustee	April 19, 2012
Thomas J. Neff
/s/ James L.L. Tullis	Director/Trustee	April 19, 2012
James L.L. Tullis

EXHIBIT A

Lord Abbett Affiliated Fund, Inc.

Lord Abbett Bond-Debenture Fund, Inc.

Lord Abbett Developing Growth Fund, Inc.

Lord Abbett Equity Trust

Lord Abbett Global Fund, Inc.

Lord Abbett Investment Trust

Lord Abbett Mid Cap Stock Fund, Inc.

Lord Abbett Municipal Income Fund, Inc.

Lord Abbett Research Fund, Inc.

Lord Abbett Securities Trust

Lord Abbett Series Fund, Inc.

Lord Abbett Stock Appreciation Fund

Lord Abbett U.S. Government & Government Sponsored Enterprises Money Market Fund, Inc.

EXHIBIT INDEX

Exhibit No.	Description
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Small-Cap Value Series

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund’s investment objective is long-term capital appreciation.

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 $50,000 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 68 of the prospectus and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 8-1 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)

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 41.95% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

41.95%

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 $50,000 in the Lord Abbett Family of Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

Expenses Restated to Reflect Current [Text]

rr_ExpensesRestatedToReflectCurrent

These amounts have been restated from fiscal year amounts to reflect current fees and expenses.

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The following 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 at the maximum sales charge, if any, 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, that dividends and distributions are reinvested, and that the Fund’s operating expenses remain the same. The example assumes a deduction of the applicable contingent deferred sales charge (“CDSC”) for the one-year, three-year, and five- year periods for Class B shares and for the one-year period for Class C shares. Class B shares automatically convert to Class A shares after approximately eight years. The expense example for Class B shares for the ten-year period reflects the conversion to Class A shares. The first example assumes that you redeem all of your shares at the end of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs (including any applicable CDSC) would be as shown below. The second example assumes that you do not redeem and instead keep your shares.

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

To pursue its objective, under normal market conditions, the Fund invests at least 80% of its net assets in equity securities of small companies. The Fund invests principally in small U.S. companies that portfolio management believes are undervalued.

The Fund may invest in U.S. and foreign (which may include emerging market) companies. Foreign companies may be traded on U.S. or non-U.S. securities exchanges and may include American Depositary Receipts (“ADRs”). The Fund’s investments primarily include the following types of securities and other financial instruments:

• Equity securities, including common stocks, preferred stocks, and equity interests in trusts (including real estate investment trusts), partnerships, joint ventures, and limited liability companies. The Fund considers equity securities to include rights offerings and investments that convert into the equity securities described above.

• Small companies having a market capitalization at the time of purchase that falls within the market capitalization range of companies in the Russell 2000^® Index.

• Value companies that portfolio management believes to be underpriced or undervalued according to certain financial measurements of intrinsic worth or business prospects and have the potential for capital appreciation.

At its discretion and consistent with the Fund’s investment objective, the Fund selectively may use derivatives, including futures, forwards, options, and swaps, to hedge against the decline in value of the Fund’s investments and for other risk management purposes, to efficiently gain targeted investment exposure, and to seek to increase the Fund’s investment returns.

The Fund generally will 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; however, in response to adverse economic, market or other unfavorable conditions, the Fund may invest its assets in a temporary defensive manner.

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:

• Portfolio Management Risk: If the strategies used and securities selected by the Fund’s portfolio management 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 rising market.

• Equity Risk: Common stocks and other equity securities, as well as equity-like securities such as convertible bonds, 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.

• Small Company Risk: Securities of small companies generally involve greater risks than investments in larger companies. Small companies may have limited management experience or depth, limited access to capital, or limited products or services, or operate in markets that have not yet been established. Small company securities tend to be more volatile and less liquid than equity securities of larger companies.

• Value Investing Risk: The prices of value stocks may lag the stock market for long periods of time if the market fails to recognize the company’s intrinsic worth.

• Foreign Company Risk: The Fund’s investment exposure to foreign (which may include emerging market) companies generally is subject to the risk that the value of securities issued by foreign companies may be adversely affected by political, economic and social volatility, lack of transparency or inadequate regulatory and accounting standards, inadequate exchange control regulations, foreign taxes, higher transaction and other costs, and delays in settlement. Because the Fund’s limit on foreign securities focuses on where the security is principally traded rather than where the issuer is organized and/or operated, the percentage of the Fund’s assets that is exposed to foreign market risks may exceed the percentage of the Fund’s assets that the Fund considers to represent foreign securities. Emerging market securities generally are more volatile than other foreign securities, and are subject to greater liquidity, regulatory, and political risks.

• Derivatives Risk: Derivatives are subject to certain risks, including the risk that the value of the derivative may not correlate with the value of the underlying security, rate, or index in the manner anticipated by portfolio management. Derivatives may be more sensitive to changes in economic or market conditions and may become illiquid. Derivatives are subject to leverage risk, which may increase the Fund’s volatility, and counterparty risk, which means that the counterparty may fail to perform its obligations under the derivative contract.

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 Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

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 Footnotes [Text Block]

rr_BarChartFootnotesTextBlock

* The year-to-date return for Class A shares as of June 30, 2012 was 2.13%.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Best Quarter 4th Q ’11 +19.73% Worst Quarter 3rd Q ’11 -24.62%

Year to Date Return, Label

rr_YearToDateReturnLabel

The year-to-date return for Class A shares as of June 30, 2012 was 2.13%.

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2011

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

2.13%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2011

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

19.73%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Jun. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(24.62%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns (for the periods ended December 31, 2011)

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

The Fund's average annual total returns include applicable sales charges as follows: for Class A shares, the current maximum front-end sales charge of 5.75%; for Class B shares, the current CDSC of 4.00% for the one-year period and 1.00% for the five-year period; and for Class C shares, the performance shown is at net asset value ("NAV") because there is no CDSC for Class C shares for any period one year or greater. There are no sales charges for Class F, I, P, R2, and R3 shares.

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- deferred 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 average annual total returns of the Fund compare to the returns of securities indices. The Fund’s average annual total returns include applicable sales charges as follows: for Class A shares, the current maximum front-end sales charge of 5.75%; for Class B shares, the current CDSC of 4.00% for the one-year period and 1.00% for the five-year period; and for Class C shares, the performance shown is at net asset value (“NAV”) because there is no CDSC for Class C shares for any period one year or greater. There are no sales charges for Class F, I, P, R2, and R3 shares. Class B shares automatically convert to Class A shares at approximately eight years after purchase. All returns for Class B shares for periods greater than eight years reflect this conversion.

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- deferred 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.

Russell 2000® Index 9/28/2007 (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(4.18%)

5 Years

rr_AverageAnnualReturnYear05

0.15%

10 Years

rr_AverageAnnualReturnYear10

5.62%

Life of Class

rr_AverageAnnualReturnSinceInception

(0.55%)

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

Russell 2000® Index 3/31/2008 (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(4.18%)

5 Years

rr_AverageAnnualReturnYear05

0.15%

10 Years

rr_AverageAnnualReturnYear10

5.62%

Life of Class

rr_AverageAnnualReturnSinceInception

3.46%

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Mar. 31, 2008

Russell 2000® Value Index 9/28/2007 (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(5.50%)

5 Years

rr_AverageAnnualReturnYear05

(1.87%)

10 Years

rr_AverageAnnualReturnYear10

6.40%

Life of Class

rr_AverageAnnualReturnSinceInception

(1.57%)

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

Russell 2000® Value Index 3/31/2008 (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(5.50%)

5 Years

rr_AverageAnnualReturnYear05

(1.87%)

10 Years

rr_AverageAnnualReturnYear10

6.40%

Life of Class

rr_AverageAnnualReturnSinceInception

2.04%

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Mar. 31, 2008

Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management Fees

rr_ManagementFeesOverAssets

0.73%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.30%

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.23%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

693

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

943

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,212

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,978

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

693

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

943

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,212

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,978

Annual Return 2002

rr_AnnualReturn2002

(11.09%)

Annual Return 2003

rr_AnnualReturn2003

44.94%

Annual Return 2004

rr_AnnualReturn2004

22.39%

Annual Return 2005

rr_AnnualReturn2005

13.21%

Annual Return 2006

rr_AnnualReturn2006

20.42%

Annual Return 2007

rr_AnnualReturn2007

10.43%

Annual Return 2008

rr_AnnualReturn2008

(31.06%)

Annual Return 2009

rr_AnnualReturn2009

29.82%

Annual Return 2010

rr_AnnualReturn2010

26.23%

Annual Return 2011

rr_AnnualReturn2011

(4.61%)

1 Year

rr_AverageAnnualReturnYear01

(10.10%)

5 Years

rr_AverageAnnualReturnYear05

2.32%

10 Years

rr_AverageAnnualReturnYear10

9.20%

Class A | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(10.10%)

5 Years

rr_AverageAnnualReturnYear05

1.76%

10 Years

rr_AverageAnnualReturnYear10

8.00%

Class A | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(6.57%)

5 Years

rr_AverageAnnualReturnYear05

1.87%

10 Years

rr_AverageAnnualReturnYear10

7.72%

Class B

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

5.00%

Management Fees

rr_ManagementFeesOverAssets

0.73%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.93%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

696

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

906

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,242

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,072

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

196

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

606

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,042

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,072

1 Year

rr_AverageAnnualReturnYear01

(9.07%)

5 Years

rr_AverageAnnualReturnYear05

2.65%

10 Years

rr_AverageAnnualReturnYear10

9.27%

Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[2]

Management Fees

rr_ManagementFeesOverAssets

0.73%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.93%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

296

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

606

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,042

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,254

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

196

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

606

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,042

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,254

1 Year

rr_AverageAnnualReturnYear01

(5.24%)

5 Years

rr_AverageAnnualReturnYear05

2.83%

10 Years

rr_AverageAnnualReturnYear10

9.14%

Class F

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.73%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.10%

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.03%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

105

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

328

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

569

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,259

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

105

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

328

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

569

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,259

1 Year

rr_AverageAnnualReturnYear01

(4.44%)

Life of Class

rr_AverageAnnualReturnSinceInception

1.37%

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.73%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.93%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

95

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

296

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

515

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,143

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

95

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

296

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

515

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,143

1 Year

rr_AverageAnnualReturnYear01

(4.36%)

5 Years

rr_AverageAnnualReturnYear05

3.84%

10 Years

rr_AverageAnnualReturnYear10

10.21%

Class P

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.73%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.45%

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.38%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

140

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

437

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

755

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,657

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

140

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

437

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

755

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,657

1 Year

rr_AverageAnnualReturnYear01

(4.76%)

5 Years

rr_AverageAnnualReturnYear05

3.38%

10 Years

rr_AverageAnnualReturnYear10

9.72%

Class R2

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.73%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.60%

Other Expenses

rr_OtherExpensesOverAssets

0.20%

^[3]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.53%

^[3]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

156

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

483

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

834

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,824

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

156

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

483

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

834

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,824

1 Year

rr_AverageAnnualReturnYear01

(4.90%)

Life of Class

rr_AverageAnnualReturnSinceInception

3.83%

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Mar. 31, 2008

Class R3

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.73%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.43%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

146

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

452

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

782

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,713

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

146

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

452

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

782

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,713

1 Year

rr_AverageAnnualReturnYear01

(4.81%)

Life of Class

rr_AverageAnnualReturnSinceInception

3.92%

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Mar. 31, 2008

[1] 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.

[2] A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

[3] These amounts have been restated from fiscal year amounts to reflect current fees and expenses.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Lord Abbett Growth Opportunities Fund

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund’s investment objective is capital appreciation.

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 $50,000 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 68 of the prospectus and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 8-1 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

2014-03-31

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 121.66% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

121.66%

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 $50,000 in the Lord Abbett Family of Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

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

The following 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 at the maximum sales charge, if any, 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, that dividends and distributions are reinvested, and that the Fund’s operating expenses remain the same (except that the example takes into account the contractual management fee waiver and expense reimbursement agreement between the Fund and Lord, Abbett & Co. LLC for the term of the agreement). The example assumes a deduction of the applicable contingent deferred sales charge (“CDSC”) for the one-year, three-year, and five-year periods for Class B shares and for the one-year period for Class C shares. Class B shares automatically convert to Class A shares after approximately eight years. The expense example for Class B shares for the ten-year period reflects the conversion to Class A shares. The first example assumes that you redeem all of your shares at the end of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs (including any applicable CDSC) would be as shown below. The second example assumes that you do not redeem and instead keep your shares.

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 market conditions, the Fund pursues its investment objective by investing at least 65% of its net assets in equity securities of mid-sized companies. The Fund follows a growth style of investing, which means that we favor companies that show the potential for strong revenue and earnings growth.

The Fund may invest in U.S. and foreign (which may include emerging market) companies. Foreign companies may be traded on U.S. or non-U.S. securities exchanges and may include American Depositary Receipts (“ADRs”). The Fund’s investments primarily include the following types of securities and other financial instruments:

• Equity securities, including common stocks, preferred stocks, and equity interests in trusts (including real estate investment trusts), partnerships, joint ventures, and limited liability companies. The Fund considers equity securities to include rights offerings and investments that convert into the equity securities described above.

• Mid-sized companies having a market capitalization at the time of purchase that falls within the market capitalization range of companies in the Russell Midcap® Index.

• Growth companies that portfolio management believes exhibit faster-than-average gains in earnings and have the potential to continue profit growth at a high level.

At its discretion and consistent with the Fund’s investment objective, the Fund selectively may use derivatives, including futures, forwards, options, and swaps, to hedge against the decline in value of the Fund’s investments and for other risk management purposes, to efficiently gain targeted investment exposure, and to seek to increase the Fund’s investment returns.

The Fund generally will 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; however, in response to adverse economic, market or other unfavorable conditions, the Fund may invest its assets in a temporary defensive manner.

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:

• Portfolio Management Risk: If the strategies used and securities selected by the Fund’s portfolio management 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 rising market.

• Equity Risk: Common stocks and other equity securities, as well as equity-like securities such as convertible bonds, 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.

• Mid-Sized Company Risk: Securities of mid-sized companies generally involve greater risks than investments in larger companies. Mid-sized companies may have limited management experience or depth, limited access to capital, or limited products or services, or operate in markets that have not yet been established. Mid-sized company securities tend to be more volatile and less liquid than equity securities of larger companies.

• Growth Investing Risk: Growth stocks tend to be more volatile than slower-growing value stocks. The prices of growth stocks may fall dramatically if, for example, the company fails to meet earnings or revenue projections.

• Foreign Company Risk: The Fund’s investment exposure to foreign (which may include emerging market) companies generally is subject to the risk that the value of securities issued by foreign companies may be adversely affected by political, economic and social volatility, lack of transparency or inadequate regulatory and accounting standards, inadequate exchange control regulations, foreign taxes, higher transaction and other costs, and delays in settlement. Because the Fund’s limit on foreign securities focuses on where the security is principally traded rather than where the issuer is organized and/or operated, the percentage of the Fund’s assets that is exposed to foreign market risks may exceed the percentage of the Fund’s assets that the Fund considers to represent foreign securities. Emerging market securities generally are more volatile than other foreign securities, and are subject to greater liquidity, regulatory, and political risks.

• Derivatives Risk: Derivatives are subject to certain risks, including the risk that the value of the derivative may not correlate with the value of the underlying security, rate, or index in the manner anticipated by portfolio management. Derivatives may be more sensitive to changes in economic or market conditions and may become illiquid. Derivatives are subject to leverage risk, which may increase the Fund’s volatility, and counterparty risk, which means that the counterparty may fail to perform its obligations under the derivative contract.

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 Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

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 Footnotes [Text Block]

rr_BarChartFootnotesTextBlock

* The year-to-date return for Class A shares as of June 30, 2012 was 9.52%.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Best Quarter 2nd Q ’09 +17.60% Worst Quarter 3rd Q ’11 -24.99%

Year to Date Return, Label

rr_YearToDateReturnLabel

The year-to-date return for Class A shares as of June 30, 2012 was 9.52%.

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2011

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

9.52%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2011

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

17.60%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(24.99%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns (for the periods ended December 31, 2011)

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

The Fund's average annual total returns include applicable sales charges as follows: for Class A shares, the current maximum front-end sales charge of 5.75%; for Class B shares, the current CDSC of 4.00% for the one-year period and 1.00% for the five-year period; and for Class C shares, the performance shown is at net asset value ("NAV") because there is no CDSC for Class C shares for any period one year or greater. There are no sales charges for Class F, I, P, R2, and R3 shares.

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- deferred 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 average annual total returns of the Fund compare to the returns of securities indices. The Fund’s average annual total returns include applicable sales charges as follows: for Class A shares, the current maximum front-end sales charge of 5.75%; for Class B shares, the current CDSC of 4.00% for the one-year period and 1.00% for the five-year period; and for Class C shares, the performance shown is at net asset value (“NAV”) because there is no CDSC for Class C shares for any period one year or greater. There are no sales charges for Class F, I, P, R2, and R3 shares. Class B shares automatically convert to Class A shares at approximately eight years after purchase. All returns for Class B shares for periods greater than eight years reflect this conversion.

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- deferred 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.

Russell Midcap® Growth Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(1.65%)

5 Years

rr_AverageAnnualReturnYear05

2.44%

10 Years

rr_AverageAnnualReturnYear10

5.29%

Life of Class

rr_AverageAnnualReturnSinceInception

(0.11%)

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

Russell Midcap® Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(1.55%)

5 Years

rr_AverageAnnualReturnYear05

1.41%

10 Years

rr_AverageAnnualReturnYear10

6.99%

Life of Class

rr_AverageAnnualReturnSinceInception

(0.48%)

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management Fees

rr_ManagementFeesOverAssets

0.75%

^[2]

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.35%

Other Expenses

rr_OtherExpensesOverAssets

0.31%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.41%

^[2],[3]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

710

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

996

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,302

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,169

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

710

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

996

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,302

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,169

Annual Return 2002

rr_AnnualReturn2002

(25.25%)

Annual Return 2003

rr_AnnualReturn2003

33.85%

Annual Return 2004

rr_AnnualReturn2004

11.52%

Annual Return 2005

rr_AnnualReturn2005

4.17%

Annual Return 2006

rr_AnnualReturn2006

7.28%

Annual Return 2007

rr_AnnualReturn2007

21.05%

Annual Return 2008

rr_AnnualReturn2008

(38.28%)

Annual Return 2009

rr_AnnualReturn2009

45.37%

Annual Return 2010

rr_AnnualReturn2010

23.26%

Annual Return 2011

rr_AnnualReturn2011

(10.04%)

1 Year

rr_AverageAnnualReturnYear01

(15.21%)

5 Years

rr_AverageAnnualReturnYear05

2.56%

10 Years

rr_AverageAnnualReturnYear10

3.54%

Class A | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(17.24%)

5 Years

rr_AverageAnnualReturnYear05

1.39%

10 Years

rr_AverageAnnualReturnYear10

2.76%

Class A | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(7.28%)

5 Years

rr_AverageAnnualReturnYear05

1.96%

10 Years

rr_AverageAnnualReturnYear10

2.92%

Class B

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

5.00%

Management Fees

rr_ManagementFeesOverAssets

0.75%

^[2]

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.31%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.06%

^[2],[3]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

709

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

946

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,308

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,223

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

209

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

646

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,108

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,223

1 Year

rr_AverageAnnualReturnYear01

(13.56%)

5 Years

rr_AverageAnnualReturnYear05

2.97%

10 Years

rr_AverageAnnualReturnYear10

3.63%

Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[4]

Management Fees

rr_ManagementFeesOverAssets

0.75%

^[2]

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.31%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.06%

^[2],[3]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

309

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

646

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,108

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,390

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

209

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

646

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,108

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,390

1 Year

rr_AverageAnnualReturnYear01

(10.61%)

5 Years

rr_AverageAnnualReturnYear05

3.12%

10 Years

rr_AverageAnnualReturnYear10

3.50%

Class F

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.75%

^[2]

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.10%

Other Expenses

rr_OtherExpensesOverAssets

0.31%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.16%

^[2],[3]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

118

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

368

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

638

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,409

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

118

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

368

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

638

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,409

1 Year

rr_AverageAnnualReturnYear01

(9.88%)

Life of Class

rr_AverageAnnualReturnSinceInception

0.60%

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.75%

^[2]

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.31%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.06%

^[2],[3]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

108

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

337

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

585

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,294

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

108

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

337

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

585

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,294

1 Year

rr_AverageAnnualReturnYear01

(9.77%)

5 Years

rr_AverageAnnualReturnYear05

4.14%

10 Years

rr_AverageAnnualReturnYear10

4.50%

Class P

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.75%

^[2]

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.45%

Other Expenses

rr_OtherExpensesOverAssets

0.31%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.51%

^[2],[3]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

154

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

477

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

824

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,802

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

154

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

477

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

824

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,802

1 Year

rr_AverageAnnualReturnYear01

(10.18%)

5 Years

rr_AverageAnnualReturnYear05

3.68%

10 Years

rr_AverageAnnualReturnYear10

4.06%

Class R2

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.75%

^[2]

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.60%

Other Expenses

rr_OtherExpensesOverAssets

0.31%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.66%

^[2],[3]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

169

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

523

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

902

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,965

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

169

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

523

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

902

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,965

1 Year

rr_AverageAnnualReturnYear01

(10.30%)

Life of Class

rr_AverageAnnualReturnSinceInception

0.13%

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

Class R3

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.75%

^[2]

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.31%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.56%

^[2],[3]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

159

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

493

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

850

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,856

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

159

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

493

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

850

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,856

1 Year

rr_AverageAnnualReturnYear01

(10.18%)

Life of Class

rr_AverageAnnualReturnSinceInception

0.24%

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

[1] 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.

[2] These amounts have been updated from fiscal year amounts to reflect current fees and expenses.

[3] For the period from September 27, 2012 through March 31, 2014, Lord Abbett has contractually agreed to waive all or a portion of its management fee and administrative services fee and, if necessary, reimburse the Fund's other expenses to the extent necessary so that the total net annual operating expenses for each class, excluding 12b-1 fees, do not exceed an annual rate of 1.10%. This agreement may be terminated only upon the approval of the Fund's Board of Directors.

[4] A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Lord Abbett Calibrated Dividend Growth Fund

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund’s investment objective is to seek current income and capital appreciation.

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 $50,000 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 68 of the prospectus and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 8-1 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

2014-03-31

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 22.87% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

22.87%

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 $50,000 in the Lord Abbett Family of Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

Expenses Restated to Reflect Current [Text]

rr_ExpensesRestatedToReflectCurrent

This amount has 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

The following 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 at the maximum sales charge, if any, 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, that dividends and distributions are reinvested, and that the Fund’s operating expenses remain the same (except that the example takes into account the contractual management fee waiver and expense reimbursement agreement between the Fund and Lord, Abbett & Co. LLC (“Lord Abbett”) for the term of the agreement). The example assumes a deduction of the applicable contingent deferred sales charge (“CDSC”) for the one-year, three-year, and five-year periods for Class B shares and for the one-year period for Class C shares. Class B shares automatically convert to Class A shares after approximately eight years. The expense example for Class B shares for the ten-year period reflects the conversion to Class A shares. The first example assumes that you redeem all of your shares at the end of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs (including any applicable CDSC) would be as shown below. The second example assumes that you do not redeem and instead keep your shares.

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

The Fund invests principally in equity securities of large and mid-sized companies that have a history of increasing dividends and that have the potential for capital appreciation. The Fund’s portfolio management team uses fundamental research and quantitative analysis to select the Fund’s investments, while seeking to maintain an investment portfolio with industry, sector, and capitalization weightings and other portfolio characteristics that generally are similar to those of the S&P 900 10-Year Dividend Growth Index (the “Dividend Growth Index”). The Dividend Growth Index is the exclusive property of Standard & Poor’s Financial Services LLC (“S&P”). Under a contract with Lord Abbett, S&P administers, maintains, and calculates the Dividend Growth Index. S&P and its affiliates will have no liability for any errors or omissions in calculating the Dividend Growth Index.

The Fund focuses on U.S. large and mid-sized companies that historically have grown their dividends over time, which represent a relatively narrow market segment compared to the broader U.S. equity markets. The Fund also may invest to a lesser extent in foreign companies. Under normal market conditions, the Fund’s investments primarily include the following types of securities and other financial instruments:

• Equity securities of large and mid-sized companies. Equity securities may include common stocks, preferred stocks, and equity interests in trusts, partnerships, joint ventures, and limited liability companies. The Fund considers equity securities to include rights offerings and investments that convert into the equity securities described above.

• Dividend paying securities issued by companies that pay out a portion of their profits to shareholders instead of reinvesting all their profits in their businesses. Although issuers of dividend paying securities may include fast growing companies, they more commonly consist of “value” companies whose securities have the potential for investment return because they are underpriced or undervalued according to certain financial measurements of intrinsic worth or business prospects.

The Fund generally will 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; however, in response to adverse economic, market or other unfavorable conditions, the Fund may invest its assets in a temporary defensive manner.

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:

• Investment Strategy Risk: If the Fund’s fundamental research and quantitative analysis fail to produce the intended result, the Fund may suffer losses or underperform its benchmark or other funds with the same investment objective or strategies, even in a rising market. In addition, the Fund’s strategy of focusing on the relatively narrow market segment of dividend paying companies means the Fund will be more exposed to risks associated with that particular market segment than a fund that invests more widely.

• Equity Risk: Common stocks and other equity securities, as well as equity-like securities such as convertible bonds, 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.

• Dividend Risk: Securities of dividend paying companies may become less available for purchase, limiting the Fund’s ability to produce current income and increasing the volatility of the Fund’s returns. At times, the performance of dividend paying companies may lag the performance of other companies or the broader market as a whole. In addition, a company’s dividend payments may vary over time, and there is no guarantee that a company will pay a dividend at all.

• Large Company Risk: As compared to smaller successful companies, larger companies may be less able to respond quickly to certain market developments and may have slower rates of growth.

• Mid-Sized Company Risk: Securities of mid-sized companies generally involve greater risks than investments in larger companies. Mid-sized companies may have limited management experience or depth, limited access to capital, or limited products or services, or operate in markets that have not yet been established. Mid-sized company securities tend to be more volatile and less liquid than equity securities of larger companies.

• Value Investing Risk: The prices of value stocks may lag the stock market for long periods of time if the market fails to recognize the company’s intrinsic worth.

• Foreign Company Risk: The Fund’s 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. In addition, they may be subject to less government supervision.

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 Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

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 Additional Market Index [Text]

rr_PerformanceAdditionalMarketIndex

The Fund believes that the Dividend Growth Index is a more appropriate index than the 60% S&P 500 Index/40% Barclays Capital U.S. Aggregate Bond Index, in light of the composition of the Fund's portfolio following implementation of its dividend oriented equity strategy. Because the Dividend Growth Index more closely reflects the market segment in which the Fund invests, the Fund will remove the 60% S&P 500 Index/40% Barclays Capital U.S. Aggregate Bond Index from the performance table in the future.

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.

The bar chart and table show performance of the Fund during periods when the Fund operated under the name "Lord Abbett Capital Structure Fund" and invested in a mix of equity and fixed income securities. Effective on or about September 27, 2012, the Fund will implement its present dividend-oriented equity strategy. This change is likely to affect the Fund's performance in the future.

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 Footnotes [Text Block]

rr_BarChartFootnotesTextBlock

* The year-to-date return for Class A shares as of June 30, 2012 was 6.67%.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Best Quarter 4th Q ‘03 +12.47% Worst Quarter 3rd Q ’11 -13.93%

Year to Date Return, Label

rr_YearToDateReturnLabel

The year-to-date performance for Class A shares as of June 30, 2012 was 6.67%.

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

6.67%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Dec. 31, 2003

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

12.47%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(13.93%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns (for the periods ended December 31, 2011)

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

The Fund's average annual total returns include applicable sales charges as follows: for Class A shares, the current maximum front-end sales charge of 5.75%; for Class B shares, the current CDSC of 4.00% for the one-year period and 1.00% for the five-year period; and for Class C shares, the performance shown is at net asset value ("NAV") because there is no CDSC for Class C shares for any period one year or greater. There are no sales charges for Class F, I, P, R2, and R3 shares.

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- deferred 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 average annual total returns of the Fund compare to the returns of securities indices. The Fund believes that the Dividend Growth Index is a more appropriate index than the 60% S&P 500 Index/40% Barclays Capital U.S. Aggregate Bond Index, in light of the composition of the Fund’s portfolio following implementation of its dividend oriented equity strategy. Because the Dividend Growth Index more closely reflects the market segment in which the Fund invests, the Fund will remove the 60% S&P 500 Index/40% Barclays Capital U.S. Aggregate Bond Index from the performance table in the future.

The Fund’s average annual total returns include applicable sales charges as follows: for Class A shares, the current maximum front-end sales charge of 5.75%; for Class B shares, the current CDSC of 4.00% for the one-year period and 1.00% for the five-year period; and for Class C shares, the performance shown is at net asset value (“NAV”) because there is no CDSC for Class C shares for any period one year or greater. There are no sales charges for Class F, I, P, R2, and R3 shares. Class B shares automatically convert to Class A shares at approximately eight years after purchase. All returns for Class B shares for periods greater than eight years reflect this conversion.

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- deferred 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.

S&P 500® Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

2.11%

5 Years

rr_AverageAnnualReturnYear05

(0.25%)

10 Years

rr_AverageAnnualReturnYear10

2.92%

Life of Class

rr_AverageAnnualReturnSinceInception

(2.32%)

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

S&P 900 10-Year Dividend Growth Index* (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

^[1]

5 Years

rr_AverageAnnualReturnYear05

^[1]

10 Years

rr_AverageAnnualReturnYear10

^[1]

Life of Class

rr_AverageAnnualReturnSinceInception

^[1]

60% S&P 500® Index / 40% Barclays Capital U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

4.69%

5 Years

rr_AverageAnnualReturnYear05

2.84%

10 Years

rr_AverageAnnualReturnYear10

4.40%

Life of Class

rr_AverageAnnualReturnSinceInception

1.70%

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

^[2]

Management Fees

rr_ManagementFeesOverAssets

0.75%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

^[3]

Other Expenses

rr_OtherExpensesOverAssets

0.22%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.22%

^[3]

Management Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.37%)

^[4]

Total Annual Fund Operating Expenses After Management Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

0.85%

^[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

657

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

887

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,155

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,920

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

657

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

887

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,155

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,920

Annual Return 2002

rr_AnnualReturn2002

(7.68%)

Annual Return 2003

rr_AnnualReturn2003

21.79%

Annual Return 2004

rr_AnnualReturn2004

16.72%

Annual Return 2005

rr_AnnualReturn2005

3.65%

Annual Return 2006

rr_AnnualReturn2006

14.78%

Annual Return 2007

rr_AnnualReturn2007

3.03%

Annual Return 2008

rr_AnnualReturn2008

(27.29%)

Annual Return 2009

rr_AnnualReturn2009

23.21%

Annual Return 2010

rr_AnnualReturn2010

14.81%

Annual Return 2011

rr_AnnualReturn2011

(0.23%)

1 Year

rr_AverageAnnualReturnYear01

(5.98%)

5 Years

rr_AverageAnnualReturnYear05

(0.07%)

10 Years

rr_AverageAnnualReturnYear10

4.52%

Class A | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(6.57%)

5 Years

rr_AverageAnnualReturnYear05

(0.96%)

10 Years

rr_AverageAnnualReturnYear10

3.67%

Class A | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(3.59%)

5 Years

rr_AverageAnnualReturnYear05

(0.39%)

10 Years

rr_AverageAnnualReturnYear10

3.59%

Class B

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

5.00%

Management Fees

rr_ManagementFeesOverAssets

0.75%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.22%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.97%

Management Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.37%)

^[4]

Total Annual Fund Operating Expenses After Management Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.60%

^[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

663

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

863

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,210

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,055

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

163

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

563

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,010

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,055

1 Year

rr_AverageAnnualReturnYear01

(4.71%)

5 Years

rr_AverageAnnualReturnYear05

0.31%

10 Years

rr_AverageAnnualReturnYear10

4.60%

Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[5]

Management Fees

rr_ManagementFeesOverAssets

0.75%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.22%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.97%

Management Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.37%)

^[4]

Total Annual Fund Operating Expenses After Management Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.60%

^[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

263

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

563

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,010

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,250

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

163

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

563

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,010

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,250

1 Year

rr_AverageAnnualReturnYear01

(0.78%)

5 Years

rr_AverageAnnualReturnYear05

0.49%

10 Years

rr_AverageAnnualReturnYear10

4.48%

Class F

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.75%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.10%

Other Expenses

rr_OtherExpensesOverAssets

0.22%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.07%

Management Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.37%)

^[4]

Total Annual Fund Operating Expenses After Management Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

0.70%

^[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

72

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

284

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

535

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,254

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

72

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

284

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

535

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,254

1 Year

rr_AverageAnnualReturnYear01

0.11%

Life of Class

rr_AverageAnnualReturnSinceInception

0.09%

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.75%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.22%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.97%

Management Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.37%)

^[4]

Total Annual Fund Operating Expenses After Management Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

0.60%

^[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

61

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

252

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

481

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,138

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

61

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

252

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

481

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,138

1 Year

rr_AverageAnnualReturnYear01

0.21%

5 Years

rr_AverageAnnualReturnYear05

1.48%

10 Years

rr_AverageAnnualReturnYear10

5.52%

Class P

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.75%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.45%

Other Expenses

rr_OtherExpensesOverAssets

0.22%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.42%

Management Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.37%)

^[4]

Total Annual Fund Operating Expenses After Management Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.05%

^[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

107

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

393

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

722

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,653

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

107

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

393

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

722

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,653

1 Year

rr_AverageAnnualReturnYear01

(0.33%)

5 Years

rr_AverageAnnualReturnYear05

1.03%

10 Years

rr_AverageAnnualReturnYear10

5.06%

Class R2

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.75%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.60%

Other Expenses

rr_OtherExpensesOverAssets

0.22%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.57%

Management Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.37%)

^[4]

Total Annual Fund Operating Expenses After Management Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.20%

^[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

122

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

440

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

801

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,819

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

122

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

440

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

801

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,819

1 Year

rr_AverageAnnualReturnYear01

(0.41%)

Life of Class

rr_AverageAnnualReturnSinceInception

(0.26%)

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

Class R3

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.75%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.22%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.47%

Management Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.37%)

^[4]

Total Annual Fund Operating Expenses After Management Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.10%

^[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

112

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

409

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

749

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,709

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

112

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

409

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

749

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,709

1 Year

rr_AverageAnnualReturnYear01

(0.36%)

Life of Class

rr_AverageAnnualReturnSinceInception

(0.30%)

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

[1] The table does not show any returns for the Dividend Growth Index because the inception of the Dividend Growth Index was in 2012.

[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] This amount has been updated from fiscal year amounts to reflect current fees and expenses.

[4] For the period from September 27, 2012 through March 31, 2014, Lord Abbett has contractually agreed to waive all or a portion of its management fee and administrative services fee and, if necessary, reimburse the Fund's other expenses to the extent necessary so that the total net annual operating expenses for each class, excluding 12b-1 fees, do not exceed an annual rate of 0.60%. This agreement may be terminated only upon the approval of the Fund's Board of Directors.

[5] A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

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Lord Abbett Calibrated Dividend Growth Fund

Lord Abbett Calibrated Dividend Growth Fund

INVESTMENT OBJECTIVE

The Fund’s investment objective is to seek current income and capital appreciation.

FEES AND EXPENSES

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 $50,000 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 68 of the prospectus and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 8-1 of the statement of additional information (“SAI”).

Shareholder Fees (Fees paid directly from your investment)

Shareholder Fees Lord Abbett Calibrated Dividend Growth Fund	Class A		Class B	Class C		Class F	Class I	Class P	Class R2	Class R3
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	5.75%		none	none		none	none	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	none	[1]	5.00%	1.00%	[2]	none	none	none	none	none

Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Lord Abbett Calibrated Dividend Growth Fund		Class A		Class B	Class C	Class F	Class I	Class P	Class R2	Class R3
Management Fees		0.75%		0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%
Distribution and Service (12b-1) Fees		0.25%	[1]	1.00%	1.00%	0.10%	none	0.45%	0.60%	0.50%
Other Expenses		0.22%		0.22%	0.22%	0.22%	0.22%	0.22%	0.22%	0.22%
Total Annual Fund Operating Expenses		1.22%	[1]	1.97%	1.97%	1.07%	0.97%	1.42%	1.57%	1.47%
Management Fee Waiver and/or Expense Reimbursement	[2]	(0.37%)		(0.37%)	(0.37%)	(0.37%)	(0.37%)	(0.37%)	(0.37%)	(0.37%)
Total Annual Fund Operating Expenses After Management Fee Waiver and/or Expense Reimbursement	[2]	0.85%		1.60%	1.60%	0.70%	0.60%	1.05%	1.20%	1.10%

Example

The following 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 at the maximum sales charge, if any, 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, that dividends and distributions are reinvested, and that the Fund’s operating expenses remain the same (except that the example takes into account the contractual management fee waiver and expense reimbursement agreement between the Fund and Lord, Abbett & Co. LLC (“Lord Abbett”) for the term of the agreement). The example assumes a deduction of the applicable contingent deferred sales charge (“CDSC”) for the one-year, three-year, and five-year periods for Class B shares and for the one-year period for Class C shares. Class B shares automatically convert to Class A shares after approximately eight years. The expense example for Class B shares for the ten-year period reflects the conversion to Class A shares. The first example assumes that you redeem all of your shares at the end of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs (including any applicable CDSC) would be as shown below. The second example assumes that you do not redeem and instead keep your shares.

If Shares Are Redeemed

Expense Example Lord Abbett Calibrated Dividend Growth Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	657	887	1,155	1,920
Class B	663	863	1,210	2,055
Class C	263	563	1,010	2,250
Class F	72	284	535	1,254
Class I	61	252	481	1,138
Class P	107	393	722	1,653
Class R2	122	440	801	1,819
Class R3	112	409	749	1,709

If Shares Are Not Redeemed

Expense Example No Redemption Lord Abbett Calibrated Dividend Growth Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	657	887	1,155	1,920
Class B	163	563	1,010	2,055
Class C	163	563	1,010	2,250
Class F	72	284	535	1,254
Class I	61	252	481	1,138
Class P	107	393	722	1,653
Class R2	122	440	801	1,819
Class R3	112	409	749	1,709

Portfolio Turnover.

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 22.87% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

The Fund invests principally in equity securities of large and mid-sized companies that have a history of increasing dividends and that have the potential for capital appreciation. The Fund’s portfolio management team uses fundamental research and quantitative analysis to select the Fund’s investments, while seeking to maintain an investment portfolio with industry, sector, and capitalization weightings and other portfolio characteristics that generally are similar to those of the S&P 900 10-Year Dividend Growth Index (the “Dividend Growth Index”). The Dividend Growth Index is the exclusive property of Standard & Poor’s Financial Services LLC (“S&P”). Under a contract with Lord Abbett, S&P administers, maintains, and calculates the Dividend Growth Index. S&P and its affiliates will have no liability for any errors or omissions in calculating the Dividend Growth Index.

The Fund focuses on U.S. large and mid-sized companies that historically have grown their dividends over time, which represent a relatively narrow market segment compared to the broader U.S. equity markets. The Fund also may invest to a lesser extent in foreign companies. Under normal market conditions, the Fund’s investments primarily include the following types of securities and other financial instruments:

• Equity securities of large and mid-sized companies. Equity securities may include common stocks, preferred stocks, and equity interests in trusts, partnerships, joint ventures, and limited liability companies. The Fund considers equity securities to include rights offerings and investments that convert into the equity securities described above.

• Dividend paying securities issued by companies that pay out a portion of their profits to shareholders instead of reinvesting all their profits in their businesses. Although issuers of dividend paying securities may include fast growing companies, they more commonly consist of “value” companies whose securities have the potential for investment return because they are underpriced or undervalued according to certain financial measurements of intrinsic worth or business prospects.

The Fund generally will 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; however, in response to adverse economic, market or other unfavorable conditions, the Fund may invest its assets in a temporary defensive manner.

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:

• Investment Strategy Risk: If the Fund’s fundamental research and quantitative analysis fail to produce the intended result, the Fund may suffer losses or underperform its benchmark or other funds with the same investment objective or strategies, even in a rising market. In addition, the Fund’s strategy of focusing on the relatively narrow market segment of dividend paying companies means the Fund will be more exposed to risks associated with that particular market segment than a fund that invests more widely.

• Equity Risk: Common stocks and other equity securities, as well as equity-like securities such as convertible bonds, 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.

• Dividend Risk: Securities of dividend paying companies may become less available for purchase, limiting the Fund’s ability to produce current income and increasing the volatility of the Fund’s returns. At times, the performance of dividend paying companies may lag the performance of other companies or the broader market as a whole. In addition, a company’s dividend payments may vary over time, and there is no guarantee that a company will pay a dividend at all.

• Large Company Risk: As compared to smaller successful companies, larger companies may be less able to respond quickly to certain market developments and may have slower rates of growth.

• Mid-Sized Company Risk: Securities of mid-sized companies generally involve greater risks than investments in larger companies. Mid-sized companies may have limited management experience or depth, limited access to capital, or limited products or services, or operate in markets that have not yet been established. Mid-sized company securities tend to be more volatile and less liquid than equity securities of larger companies.

• Value Investing Risk: The prices of value stocks may lag the stock market for long periods of time if the market fails to recognize the company’s intrinsic worth.

• Foreign Company Risk: The Fund’s 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. In addition, they may be subject to less government supervision.

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.

PERFORMANCE

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.

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.

The bar chart and table show performance of the Fund during periods when the Fund operated under the name "Lord Abbett Capital Structure Fund" and invested in a mix of equity and fixed income securities. Effective on or about September 27, 2012, the Fund will implement its present dividend-oriented equity strategy. This change is likely to affect the Fund's performance in the future.

Bar Chart (per calendar year) - Class A Shares*

* The year-to-date return for Class A shares as of June 30, 2012 was 6.67%.

Best Quarter 4th Q ‘03 +12.47% Worst Quarter 3rd Q ’11 -13.93%

Average Annual Total Returns (for the periods ended December 31, 2011)

The table below shows how the average annual total returns of the Fund compare to the returns of securities indices. The Fund believes that the Dividend Growth Index is a more appropriate index than the 60% S&P 500 Index/40% Barclays Capital U.S. Aggregate Bond Index, in light of the composition of the Fund’s portfolio following implementation of its dividend oriented equity strategy. Because the Dividend Growth Index more closely reflects the market segment in which the Fund invests, the Fund will remove the 60% S&P 500 Index/40% Barclays Capital U.S. Aggregate Bond Index from the performance table in the future.

The Fund’s average annual total returns include applicable sales charges as follows: for Class A shares, the current maximum front-end sales charge of 5.75%; for Class B shares, the current CDSC of 4.00% for the one-year period and 1.00% for the five-year period; and for Class C shares, the performance shown is at net asset value (“NAV”) because there is no CDSC for Class C shares for any period one year or greater. There are no sales charges for Class F, I, P, R2, and R3 shares. Class B shares automatically convert to Class A shares at approximately eight years after purchase. All returns for Class B shares for periods greater than eight years reflect this conversion.

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- deferred 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.

Average Annual Returns Lord Abbett Calibrated Dividend Growth Fund		1 Year	5 Years	10 Years	Life of Class	Inception Date for Performance
Class A		(5.98%)	(0.07%)	4.52%
Class A After Taxes on Distributions		(6.57%)	(0.96%)	3.67%
Class A After Taxes on Distributions and Sale of Fund Shares		(3.59%)	(0.39%)	3.59%
Class B		(4.71%)	0.31%	4.60%
Class C		(0.78%)	0.49%	4.48%
Class F		0.11%			0.09%	Sep. 28, 2007
Class I		0.21%	1.48%	5.52%
Class P		(0.33%)	1.03%	5.06%
Class R2		(0.41%)			(0.26%)	Sep. 28, 2007
Class R3		(0.36%)			(0.30%)	Sep. 28, 2007
S&P 500® Index (reflects no deduction for fees, expenses, or taxes)		2.11%	(0.25%)	2.92%	(2.32%)	Sep. 28, 2007
S&P 900 10-Year Dividend Growth Index* (reflects no deduction for fees, expenses, or taxes)	[1]
60% S&P 500® Index / 40% Barclays Capital U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)		4.69%	2.84%	4.40%	1.70%	Sep. 28, 2007

[1] 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.

[2] A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

[1] This amount has been updated from fiscal year amounts to reflect current fees and expenses.

[2] For the period from September 27, 2012 through March 31, 2014, Lord Abbett has contractually agreed to waive all or a portion of its management fee and administrative services fee and, if necessary, reimburse the Fund's other expenses to the extent necessary so that the total net annual operating expenses for each class, excluding 12b-1 fees, do not exceed an annual rate of 0.60%. This agreement may be terminated only upon the approval of the Fund's Board of Directors.

[1] The table does not show any returns for the Dividend Growth Index because the inception of the Dividend Growth Index was in 2012.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Lord Abbett Classic Stock Fund

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund’s investment objective is growth of capital and growth of income consistent with reasonable risk.

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 $50,000 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 68 of the prospectus and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 8-1 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

2014-03-31

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 27.97% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

27.97%

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 $50,000 in the Lord Abbett Family of Funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The following 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 at the maximum sales charge, if any, 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, that dividends and distributions are reinvested, and that the Fund’s operating expenses remain the same (except that the example takes into account the contractual management fee waiver and expense reimbursement agreement between the Fund and Lord, Abbett & Co. LLC for the term of the agreement). The example assumes a deduction of the applicable contingent deferred sales charge (“CDSC”) for the one-year, three-year, and five-year periods for Class B shares and for the one-year period for Class C shares. Class B shares automatically convert to Class A shares after approximately eight years. The expense example for Class B shares for the ten-year period reflects the conversion to Class A shares. The first example assumes that you redeem all of your shares at the end of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs (including any applicable CDSC) would be as shown below. The second example assumes that you do not redeem and instead keep your shares.

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

To pursue its objective, under normal market conditions, the Fund invests at least 80% of its net assets in equity securities of large, seasoned, U.S. and multinational companies. The Fund invests in the full spectrum of large companies, including those with value or growth characteristics. The Fund may invest in U.S. and foreign (which may include emerging market) companies. Foreign companies may be traded on U.S. or non-U.S. securities exchanges and may include American Depositary Receipts (“ADRs”). The Fund’s investments primarily include the following types of securities and other financial instruments:

• Equity securities, including common stocks, preferred stocks, and equity interests in trusts (including real estate investment trusts), partnerships, joint ventures, and limited liability companies. The Fund considers equity securities to include rights offerings and investments that convert into the equity securities described above.

• Large companies having a market capitalization at the time of purchase that falls within the market capitalization range of companies in the Russell 1000^® Index.

• Value companies that portfolio management believes to be underpriced or undervalued according to certain financial measurements of intrinsic worth or business prospects and have the potential for capital appreciation.

• Growth companies that portfolio management believes exhibit faster-than-average gains in earnings and have the potential to continue profit growth at a high level.

At its discretion and consistent with the Fund’s investment objective, the Fund selectively may use derivatives, including futures, forwards, options, and swaps, to hedge against the decline in value of the Fund’s investments and for other risk management purposes, to efficiently gain targeted investment exposure, and to seek to increase the Fund’s investment returns.

The Fund generally will 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; however, in response to adverse economic, market or other unfavorable conditions, the Fund may invest its assets in a temporary defensive manner.

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:

• Portfolio Management Risk: If the strategies used and securities selected by the Fund’s portfolio management 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 rising market.

• Equity Risk: Common stocks and other equity securities, as well as equity-like securities such as convertible bonds, 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.

• Large Company Risk: As compared to smaller successful companies, larger companies may be less able to respond quickly to certain market developments and may have slower rates of growth.

• Blend Style Risk: The Fund uses a “blend” strategy to invest in both growth and value stocks, or in stocks with characteristics of both. The prices of growth stocks may fall dramatically if the company fails to meet earnings or revenue projections. The prices of value stocks may lag the stock market for long periods of time if the market fails to recognize the company’s intrinsic worth.

• Foreign Company Risk: The Fund’s investment exposure to foreign (which may include emerging market) companies generally is subject to the risk that the value of securities issued by foreign companies may be adversely affected by political, economic and social volatility, lack of transparency or inadequate regulatory and accounting standards, inadequate exchange control regulations, foreign taxes, higher transaction and other costs, and delays in settlement. Because the Fund’s limit on foreign securities focuses on where the security is principally traded rather than where the issuer is organized and/or operated, the percentage of the Fund’s assets that is exposed to foreign market risks may exceed the percentage of the Fund’s assets that the Fund considers to represent foreign securities. Emerging market securities generally are more volatile than other foreign securities, and are subject to greater liquidity, regulatory, and political risks.

• Derivatives Risk: Derivatives are subject to certain risks, including the risk that the value of the derivative may not correlate with the value of the underlying security, rate, or index in the manner anticipated by portfolio management. Derivatives may be more sensitive to changes in economic or market conditions and may become illiquid. Derivatives are subject to leverage risk, which may increase the Fund’s volatility, and counterparty risk, which means that the counterparty may fail to perform its obligations under the derivatives contract.

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 Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

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 Footnotes [Text Block]

rr_BarChartFootnotesTextBlock

* The year-to-date return for Class A shares as of June 30, 2012 was 8.44%.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Best Quarter 2nd Q ’03 +18.49% Worst Quarter 4th Q ’08 -19.90%

Year to Date Return, Label

rr_YearToDateReturnLabel

The year-to-date return for Class A shares as of June 30, 2012 was 8.44%.

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Dec. 31, 2008

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

8.44%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Dec. 31, 2008

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

18.49%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(19.90%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns (for the periods ended December 31, 2011)

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

The Fund's average annual total returns include applicable sales charges as follows: for Class A shares, the current maximum front-end sales charge of 5.75%; for Class B shares, the current CDSC of 4.00% for the one-year period and 1.00% for the five-year period; and for Class C shares, the performance shown is at net asset value ("NAV") because there is no CDSC for Class C shares for any period one year or greater. There are no sales charges for Class F, I, P, R2, and R3 shares.

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- deferred 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 average annual total returns of the Fund compare to the returns of securities indices. The Fund’s average annual total returns include applicable sales charges as follows: for Class A shares, the current maximum front-end sales charge of 5.75%; for Class B shares, the current CDSC of 4.00% for the one-year period and 1.00% for the five-year period; and for Class C shares, the performance shown is at net asset value (“NAV”) because there is no CDSC for Class C shares for any period one year or greater. There are no sales charges for Class F, I, P, R2, and R3 shares. Class B shares automatically convert to Class A shares at approximately eight years after purchase. All returns for Class B shares for periods greater than eight years reflect this conversion.

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- deferred 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.

Russell 1000® Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.50%

5 Years

rr_AverageAnnualReturnYear05

(0.02%)

10 Years

rr_AverageAnnualReturnYear10

3.34%

Life of Class

rr_AverageAnnualReturnSinceInception

(2.09%)

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

S&P 500® Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

2.11%

5 Years

rr_AverageAnnualReturnYear05

(0.25%)

10 Years

rr_AverageAnnualReturnYear10

2.92%

Life of Class

rr_AverageAnnualReturnSinceInception

(2.32%)

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management Fees

rr_ManagementFeesOverAssets

0.70%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.35%

Other Expenses

rr_OtherExpensesOverAssets

0.24%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.29%

Management Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.31%)

^[2]

Total Annual Fund Operating Expenses After Management Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

0.98%

^[2]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

669

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

916

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,199

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,003

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

669

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

916

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,199

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,003

Annual Return 2002

rr_AnnualReturn2002

(19.51%)

Annual Return 2003

rr_AnnualReturn2003

31.10%

Annual Return 2004

rr_AnnualReturn2004

11.89%

Annual Return 2005

rr_AnnualReturn2005

1.47%

Annual Return 2006

rr_AnnualReturn2006

12.49%

Annual Return 2007

rr_AnnualReturn2007

10.29%

Annual Return 2008

rr_AnnualReturn2008

(31.22%)

Annual Return 2009

rr_AnnualReturn2009

26.20%

Annual Return 2010

rr_AnnualReturn2010

13.82%

Annual Return 2011

rr_AnnualReturn2011

(8.35%)

1 Year

rr_AverageAnnualReturnYear01

(13.63%)

5 Years

rr_AverageAnnualReturnYear05

(1.20%)

10 Years

rr_AverageAnnualReturnYear10

2.41%

Class A | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(13.74%)

5 Years

rr_AverageAnnualReturnYear05

(1.50%)

10 Years

rr_AverageAnnualReturnYear10

2.07%

Class A | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(8.73%)

5 Years

rr_AverageAnnualReturnYear05

(1.01%)

10 Years

rr_AverageAnnualReturnYear10

2.07%

Class B

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

5.00%

Management Fees

rr_ManagementFeesOverAssets

0.70%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.24%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.94%

Management Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.31%)

^[2]

Total Annual Fund Operating Expenses After Management Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.63%

^[2]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

666

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

863

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,203

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,057

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

166

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

563

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,003

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,057

1 Year

rr_AverageAnnualReturnYear01

(12.60%)

5 Years

rr_AverageAnnualReturnYear05

(0.87%)

10 Years

rr_AverageAnnualReturnYear10

2.48%

Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[3]

Management Fees

rr_ManagementFeesOverAssets

0.70%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.24%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.94%

Management Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.31%)

^[2]

Total Annual Fund Operating Expenses After Management Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.63%

^[2]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

266

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

563

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,003

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,226

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

166

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

563

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,003

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,226

1 Year

rr_AverageAnnualReturnYear01

(8.94%)

5 Years

rr_AverageAnnualReturnYear05

(0.68%)

10 Years

rr_AverageAnnualReturnYear10

2.38%

Class F

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.70%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.10%

Other Expenses

rr_OtherExpensesOverAssets

0.24%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.04%

Management Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.31%)

^[2]

Total Annual Fund Operating Expenses After Management Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

0.73%

^[2]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

75

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

284

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

528

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,228

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

75

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

284

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

528

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,228

1 Year

rr_AverageAnnualReturnYear01

(8.11%)

Life of Class

rr_AverageAnnualReturnSinceInception

(2.51%)

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.70%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.24%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.94%

Management Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.31%)

^[2]

Total Annual Fund Operating Expenses After Management Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

0.63%

^[2]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

64

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

252

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

474

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,111

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

64

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

252

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

474

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,111

1 Year

rr_AverageAnnualReturnYear01

(8.04%)

5 Years

rr_AverageAnnualReturnYear05

0.32%

10 Years

rr_AverageAnnualReturnYear10

3.38%

Class P

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.70%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.45%

Other Expenses

rr_OtherExpensesOverAssets

0.24%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.39%

Management Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.31%)

^[2]

Total Annual Fund Operating Expenses After Management Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.08%

^[2]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

110

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

393

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

715

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,627

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

110

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

393

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

715

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,627

1 Year

rr_AverageAnnualReturnYear01

(8.45%)

5 Years

rr_AverageAnnualReturnYear05

(0.14%)

10 Years

rr_AverageAnnualReturnYear10

2.94%

Class R2

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.70%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.60%

Other Expenses

rr_OtherExpensesOverAssets

0.24%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.54%

Management Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.31%)

^[2]

Total Annual Fund Operating Expenses After Management Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.23%

^[2]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

125

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

440

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

794

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,794

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

125

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

440

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

794

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,794

1 Year

rr_AverageAnnualReturnYear01

(8.59%)

Life of Class

rr_AverageAnnualReturnSinceInception

(2.78%)

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

Class R3

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.70%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.24%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.44%

Management Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.31%)

^[2]

Total Annual Fund Operating Expenses After Management Fee Waiver and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.13%

^[2]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

115

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

409

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

742

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,683

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

115

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

409

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

742

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,683

1 Year

rr_AverageAnnualReturnYear01

(8.49%)

Life of Class

rr_AverageAnnualReturnSinceInception

(2.89%)

Inception Date for Performance

rr_AverageAnnualReturnInceptionDate

Sep. 28, 2007

[1] 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.

[2] For the period from September 27, 2012 through March 31, 2014, Lord Abbett has contractually agreed to waive all or a portion of its management fee and administrative services fee and, if necessary, reimburse the Fund's other expenses to the extent necessary so that the total net annual operating expenses for each class, excluding 12b-1 fees, do not exceed an annual rate of 0.63%. This agreement may be terminated only upon the approval of the Fund's Board of Directors.

[3] A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

XML

Document and Entity Information	0 Months Ended
	Nov. 30, 2011
Risk/Return:
Document Type	485BPOS
Document Period End Date	Nov. 30, 2011
Registrant Name	LORD ABBETT RESEARCH FUND INC
Central Index Key	0000887194
Amendment Flag	false
Document Creation Date	Sep. 25, 2012
Document Effective Date	Sep. 27, 2012
Prospectus Date	Sep. 27, 2012

XML

Lord Abbett Growth Opportunities Fund

Lord Abbett Growth Opportunities Fund

INVESTMENT OBJECTIVE

The Fund’s investment objective is capital appreciation.

FEES AND EXPENSES

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 $50,000 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 68 of the prospectus and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 8-1 of the statement of additional information (“SAI”).

Shareholder Fees (Fees paid directly from your investment)

Shareholder Fees Lord Abbett Growth Opportunities Fund	Class A		Class B	Class C		Class F	Class I	Class P	Class R2	Class R3
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	5.75%		none	none		none	none	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	none	[1]	5.00%	1.00%	[2]	none	none	none	none	none

Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Lord Abbett Growth Opportunities Fund		Class A	Class B	Class C	Class F	Class I	Class P	Class R2	Class R3
Management Fees	[1]	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%
Distribution and Service (12b-1) Fees		0.35%	1.00%	1.00%	0.10%	none	0.45%	0.60%	0.50%
Other Expenses		0.31%	0.31%	0.31%	0.31%	0.31%	0.31%	0.31%	0.31%
Total Annual Fund Operating Expenses	[1][2]	1.41%	2.06%	2.06%	1.16%	1.06%	1.51%	1.66%	1.56%

Example

The following 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 at the maximum sales charge, if any, 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, that dividends and distributions are reinvested, and that the Fund’s operating expenses remain the same (except that the example takes into account the contractual management fee waiver and expense reimbursement agreement between the Fund and Lord, Abbett & Co. LLC for the term of the agreement). The example assumes a deduction of the applicable contingent deferred sales charge (“CDSC”) for the one-year, three-year, and five-year periods for Class B shares and for the one-year period for Class C shares. Class B shares automatically convert to Class A shares after approximately eight years. The expense example for Class B shares for the ten-year period reflects the conversion to Class A shares. The first example assumes that you redeem all of your shares at the end of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs (including any applicable CDSC) would be as shown below. The second example assumes that you do not redeem and instead keep your shares.

If Shares Are Redeemed

Expense Example Lord Abbett Growth Opportunities Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	710	996	1,302	2,169
Class B	709	946	1,308	2,223
Class C	309	646	1,108	2,390
Class F	118	368	638	1,409
Class I	108	337	585	1,294
Class P	154	477	824	1,802
Class R2	169	523	902	1,965
Class R3	159	493	850	1,856

If Shares Are Not Redeemed

Expense Example No Redemption Lord Abbett Growth Opportunities Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	710	996	1,302	2,169
Class B	209	646	1,108	2,223
Class C	209	646	1,108	2,390
Class F	118	368	638	1,409
Class I	108	337	585	1,294
Class P	154	477	824	1,802
Class R2	169	523	902	1,965
Class R3	159	493	850	1,856

Portfolio Turnover.

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 121.66% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

Under normal market conditions, the Fund pursues its investment objective by investing at least 65% of its net assets in equity securities of mid-sized companies. The Fund follows a growth style of investing, which means that we favor companies that show the potential for strong revenue and earnings growth.

The Fund may invest in U.S. and foreign (which may include emerging market) companies. Foreign companies may be traded on U.S. or non-U.S. securities exchanges and may include American Depositary Receipts (“ADRs”). The Fund’s investments primarily include the following types of securities and other financial instruments:

• Equity securities, including common stocks, preferred stocks, and equity interests in trusts (including real estate investment trusts), partnerships, joint ventures, and limited liability companies. The Fund considers equity securities to include rights offerings and investments that convert into the equity securities described above.

• Mid-sized companies having a market capitalization at the time of purchase that falls within the market capitalization range of companies in the Russell Midcap® Index.

• Growth companies that portfolio management believes exhibit faster-than-average gains in earnings and have the potential to continue profit growth at a high level.

At its discretion and consistent with the Fund’s investment objective, the Fund selectively may use derivatives, including futures, forwards, options, and swaps, to hedge against the decline in value of the Fund’s investments and for other risk management purposes, to efficiently gain targeted investment exposure, and to seek to increase the Fund’s investment returns.

The Fund generally will 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; however, in response to adverse economic, market or other unfavorable conditions, the Fund may invest its assets in a temporary defensive manner.

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:

• Portfolio Management Risk: If the strategies used and securities selected by the Fund’s portfolio management 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 rising market.

• Equity Risk: Common stocks and other equity securities, as well as equity-like securities such as convertible bonds, 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.

• Mid-Sized Company Risk: Securities of mid-sized companies generally involve greater risks than investments in larger companies. Mid-sized companies may have limited management experience or depth, limited access to capital, or limited products or services, or operate in markets that have not yet been established. Mid-sized company securities tend to be more volatile and less liquid than equity securities of larger companies.

• Growth Investing Risk: Growth stocks tend to be more volatile than slower-growing value stocks. The prices of growth stocks may fall dramatically if, for example, the company fails to meet earnings or revenue projections.

• Foreign Company Risk: The Fund’s investment exposure to foreign (which may include emerging market) companies generally is subject to the risk that the value of securities issued by foreign companies may be adversely affected by political, economic and social volatility, lack of transparency or inadequate regulatory and accounting standards, inadequate exchange control regulations, foreign taxes, higher transaction and other costs, and delays in settlement. Because the Fund’s limit on foreign securities focuses on where the security is principally traded rather than where the issuer is organized and/or operated, the percentage of the Fund’s assets that is exposed to foreign market risks may exceed the percentage of the Fund’s assets that the Fund considers to represent foreign securities. Emerging market securities generally are more volatile than other foreign securities, and are subject to greater liquidity, regulatory, and political risks.

• Derivatives Risk: Derivatives are subject to certain risks, including the risk that the value of the derivative may not correlate with the value of the underlying security, rate, or index in the manner anticipated by portfolio management. Derivatives may be more sensitive to changes in economic or market conditions and may become illiquid. Derivatives are subject to leverage risk, which may increase the Fund’s volatility, and counterparty risk, which means that the counterparty may fail to perform its obligations under the derivative contract.

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.

PERFORMANCE

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.

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 (per calendar year) - Class A Shares*

* The year-to-date return for Class A shares as of June 30, 2012 was 9.52%.

Best Quarter 2nd Q ’09 +17.60% Worst Quarter 3rd Q ’11 -24.99%

Average Annual Total Returns (for the periods ended December 31, 2011)

The table below shows how the average annual total returns of the Fund compare to the returns of securities indices. The Fund’s average annual total returns include applicable sales charges as follows: for Class A shares, the current maximum front-end sales charge of 5.75%; for Class B shares, the current CDSC of 4.00% for the one-year period and 1.00% for the five-year period; and for Class C shares, the performance shown is at net asset value (“NAV”) because there is no CDSC for Class C shares for any period one year or greater. There are no sales charges for Class F, I, P, R2, and R3 shares. Class B shares automatically convert to Class A shares at approximately eight years after purchase. All returns for Class B shares for periods greater than eight years reflect this conversion.

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- deferred 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.

Average Annual Returns Lord Abbett Growth Opportunities Fund	1 Year	5 Years	10 Years	Life of Class	Inception Date for Performance
Class A	(15.21%)	2.56%	3.54%
Class A After Taxes on Distributions	(17.24%)	1.39%	2.76%
Class A After Taxes on Distributions and Sale of Fund Shares	(7.28%)	1.96%	2.92%
Class B	(13.56%)	2.97%	3.63%
Class C	(10.61%)	3.12%	3.50%
Class F	(9.88%)			0.60%	Sep. 28, 2007
Class I	(9.77%)	4.14%	4.50%
Class P	(10.18%)	3.68%	4.06%
Class R2	(10.30%)			0.13%	Sep. 28, 2007
Class R3	(10.18%)			0.24%	Sep. 28, 2007
Russell Midcap® Growth Index (reflects no deduction for fees, expenses, or taxes)	(1.65%)	2.44%	5.29%	(0.11%)	Sep. 28, 2007
Russell Midcap® Index (reflects no deduction for fees, expenses, or taxes)	(1.55%)	1.41%	6.99%	(0.48%)	Sep. 28, 2007

[1] 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.

[2] A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

[1] These amounts have been updated from fiscal year amounts to reflect current fees and expenses.

[2] For the period from September 27, 2012 through March 31, 2014, Lord Abbett has contractually agreed to waive all or a portion of its management fee and administrative services fee and, if necessary, reimburse the Fund's other expenses to the extent necessary so that the total net annual operating expenses for each class, excluding 12b-1 fees, do not exceed an annual rate of 1.10%. This agreement may be terminated only upon the approval of the Fund's Board of Directors.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Prospectus Date	rr_ProspectusDate	Sep. 27, 2012

XML

Small-Cap Value Series

Small-Cap Value Series

INVESTMENT OBJECTIVE

The Fund’s investment objective is long-term capital appreciation.

FEES AND EXPENSES

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 $50,000 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 68 of the prospectus and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 8-1 of the statement of additional information (“SAI”).

Shareholder Fees (Fees paid directly from your investment)

Shareholder Fees Small-Cap Value Series	Class A		Class B	Class C		Class F	Class I	Class P	Class R2	Class R3
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	5.75%		none	none		none	none	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	none	[1]	5.00%	1.00%	[2]	none	none	none	none	none

Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Small-Cap Value Series	Class A	Class B	Class C	Class F	Class I	Class P	Class R2		Class R3
Management Fees	0.73%	0.73%	0.73%	0.73%	0.73%	0.73%	0.73%		0.73%
Distribution and Service (12b-1) Fees	0.30%	1.00%	1.00%	0.10%	none	0.45%	0.60%		0.50%
Other Expenses	0.20%	0.20%	0.20%	0.20%	0.20%	0.20%	0.20%	[1]	0.20%
Total Annual Fund Operating Expenses	1.23%	1.93%	1.93%	1.03%	0.93%	1.38%	1.53%	[1]	1.43%

Example

The following 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 at the maximum sales charge, if any, 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, that dividends and distributions are reinvested, and that the Fund’s operating expenses remain the same. The example assumes a deduction of the applicable contingent deferred sales charge (“CDSC”) for the one-year, three-year, and five- year periods for Class B shares and for the one-year period for Class C shares. Class B shares automatically convert to Class A shares after approximately eight years. The expense example for Class B shares for the ten-year period reflects the conversion to Class A shares. The first example assumes that you redeem all of your shares at the end of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs (including any applicable CDSC) would be as shown below. The second example assumes that you do not redeem and instead keep your shares.

If Shares Are Redeemed

Expense Example Small-Cap Value Series (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	693	943	1,212	1,978
Class B	696	906	1,242	2,072
Class C	296	606	1,042	2,254
Class F	105	328	569	1,259
Class I	95	296	515	1,143
Class P	140	437	755	1,657
Class R2	156	483	834	1,824
Class R3	146	452	782	1,713

If Shares Are Not Redeemed

Expense Example No Redemption Small-Cap Value Series (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	693	943	1,212	1,978
Class B	196	606	1,042	2,072
Class C	196	606	1,042	2,254
Class F	105	328	569	1,259
Class I	95	296	515	1,143
Class P	140	437	755	1,657
Class R2	156	483	834	1,824
Class R3	146	452	782	1,713

Portfolio Turnover.

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 41.95% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

To pursue its objective, under normal market conditions, the Fund invests at least 80% of its net assets in equity securities of small companies. The Fund invests principally in small U.S. companies that portfolio management believes are undervalued.

The Fund may invest in U.S. and foreign (which may include emerging market) companies. Foreign companies may be traded on U.S. or non-U.S. securities exchanges and may include American Depositary Receipts (“ADRs”). The Fund’s investments primarily include the following types of securities and other financial instruments:

• Equity securities, including common stocks, preferred stocks, and equity interests in trusts (including real estate investment trusts), partnerships, joint ventures, and limited liability companies. The Fund considers equity securities to include rights offerings and investments that convert into the equity securities described above.

• Small companies having a market capitalization at the time of purchase that falls within the market capitalization range of companies in the Russell 2000^® Index.

• Value companies that portfolio management believes to be underpriced or undervalued according to certain financial measurements of intrinsic worth or business prospects and have the potential for capital appreciation.

At its discretion and consistent with the Fund’s investment objective, the Fund selectively may use derivatives, including futures, forwards, options, and swaps, to hedge against the decline in value of the Fund’s investments and for other risk management purposes, to efficiently gain targeted investment exposure, and to seek to increase the Fund’s investment returns.

The Fund generally will 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; however, in response to adverse economic, market or other unfavorable conditions, the Fund may invest its assets in a temporary defensive manner.

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:

• Portfolio Management Risk: If the strategies used and securities selected by the Fund’s portfolio management 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 rising market.

• Equity Risk: Common stocks and other equity securities, as well as equity-like securities such as convertible bonds, 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.

• Small Company Risk: Securities of small companies generally involve greater risks than investments in larger companies. Small companies may have limited management experience or depth, limited access to capital, or limited products or services, or operate in markets that have not yet been established. Small company securities tend to be more volatile and less liquid than equity securities of larger companies.

• Value Investing Risk: The prices of value stocks may lag the stock market for long periods of time if the market fails to recognize the company’s intrinsic worth.

• Foreign Company Risk: The Fund’s investment exposure to foreign (which may include emerging market) companies generally is subject to the risk that the value of securities issued by foreign companies may be adversely affected by political, economic and social volatility, lack of transparency or inadequate regulatory and accounting standards, inadequate exchange control regulations, foreign taxes, higher transaction and other costs, and delays in settlement. Because the Fund’s limit on foreign securities focuses on where the security is principally traded rather than where the issuer is organized and/or operated, the percentage of the Fund’s assets that is exposed to foreign market risks may exceed the percentage of the Fund’s assets that the Fund considers to represent foreign securities. Emerging market securities generally are more volatile than other foreign securities, and are subject to greater liquidity, regulatory, and political risks.

• Derivatives Risk: Derivatives are subject to certain risks, including the risk that the value of the derivative may not correlate with the value of the underlying security, rate, or index in the manner anticipated by portfolio management. Derivatives may be more sensitive to changes in economic or market conditions and may become illiquid. Derivatives are subject to leverage risk, which may increase the Fund’s volatility, and counterparty risk, which means that the counterparty may fail to perform its obligations under the derivative contract.

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.

PERFORMANCE

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.

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 (per calendar year) - Class A Shares*

* The year-to-date return for Class A shares as of June 30, 2012 was 2.13%.

Best Quarter 4th Q ’11 +19.73% Worst Quarter 3rd Q ’11 -24.62%

Average Annual Total Returns (for the periods ended December 31, 2011)

The table below shows how the average annual total returns of the Fund compare to the returns of securities indices. The Fund’s average annual total returns include applicable sales charges as follows: for Class A shares, the current maximum front-end sales charge of 5.75%; for Class B shares, the current CDSC of 4.00% for the one-year period and 1.00% for the five-year period; and for Class C shares, the performance shown is at net asset value (“NAV”) because there is no CDSC for Class C shares for any period one year or greater. There are no sales charges for Class F, I, P, R2, and R3 shares. Class B shares automatically convert to Class A shares at approximately eight years after purchase. All returns for Class B shares for periods greater than eight years reflect this conversion.

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- deferred 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.

Average Annual Returns Small-Cap Value Series	1 Year	5 Years	10 Years	Life of Class	Inception Date for Performance
Class A	(10.10%)	2.32%	9.20%
Class A After Taxes on Distributions	(10.10%)	1.76%	8.00%
Class A After Taxes on Distributions and Sale of Fund Shares	(6.57%)	1.87%	7.72%
Class B	(9.07%)	2.65%	9.27%
Class C	(5.24%)	2.83%	9.14%
Class F	(4.44%)			1.37%	Sep. 28, 2007
Class I	(4.36%)	3.84%	10.21%
Class P	(4.76%)	3.38%	9.72%
Class R2	(4.90%)			3.83%	Mar. 31, 2008
Class R3	(4.81%)			3.92%	Mar. 31, 2008
Russell 2000® Index 9/28/2007 (reflects no deduction for fees, expenses, or taxes)	(4.18%)	0.15%	5.62%	(0.55%)	Sep. 28, 2007
Russell 2000® Index 3/31/2008 (reflects no deduction for fees, expenses, or taxes)	(4.18%)	0.15%	5.62%	3.46%	Mar. 31, 2008
Russell 2000® Value Index 9/28/2007 (reflects no deduction for fees, expenses, or taxes)	(5.50%)	(1.87%)	6.40%	(1.57%)	Sep. 28, 2007
Russell 2000® Value Index 3/31/2008 (reflects no deduction for fees, expenses, or taxes)	(5.50%)	(1.87%)	6.40%	2.04%	Mar. 31, 2008

[1] 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.

[2] A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

[1] These amounts have been restated from fiscal year amounts to reflect current fees and expenses.

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Lord Abbett Classic Stock Fund

Lord Abbett Classic Stock Fund

INVESTMENT OBJECTIVE

The Fund’s investment objective is growth of capital and growth of income consistent with reasonable risk.

FEES AND EXPENSES

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 $50,000 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 68 of the prospectus and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 8-1 of the statement of additional information (“SAI”).

Shareholder Fees (Fees paid directly from your investment)

Shareholder Fees Lord Abbett Classic Stock Fund	Class A		Class B	Class C		Class F	Class I	Class P	Class R2	Class R3
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	5.75%		none	none		none	none	none	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	none	[1]	5.00%	1.00%	[2]	none	none	none	none	none

Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Lord Abbett Classic Stock Fund		Class A	Class B	Class C	Class F	Class I	Class P	Class R2	Class R3
Management Fees		0.70%	0.70%	0.70%	0.70%	0.70%	0.70%	0.70%	0.70%
Distribution and Service (12b-1) Fees		0.35%	1.00%	1.00%	0.10%	none	0.45%	0.60%	0.50%
Other Expenses		0.24%	0.24%	0.24%	0.24%	0.24%	0.24%	0.24%	0.24%
Total Annual Fund Operating Expenses		1.29%	1.94%	1.94%	1.04%	0.94%	1.39%	1.54%	1.44%
Management Fee Waiver and/or Expense Reimbursement	[1]	(0.31%)	(0.31%)	(0.31%)	(0.31%)	(0.31%)	(0.31%)	(0.31%)	(0.31%)
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	[1]	0.98%	1.63%	1.63%	0.73%	0.63%	1.08%	1.23%	1.13%

Example

The following 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 at the maximum sales charge, if any, 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, that dividends and distributions are reinvested, and that the Fund’s operating expenses remain the same (except that the example takes into account the contractual management fee waiver and expense reimbursement agreement between the Fund and Lord, Abbett & Co. LLC for the term of the agreement). The example assumes a deduction of the applicable contingent deferred sales charge (“CDSC”) for the one-year, three-year, and five-year periods for Class B shares and for the one-year period for Class C shares. Class B shares automatically convert to Class A shares after approximately eight years. The expense example for Class B shares for the ten-year period reflects the conversion to Class A shares. The first example assumes that you redeem all of your shares at the end of the periods. Although your actual costs may be higher or lower, based on these assumptions, your costs (including any applicable CDSC) would be as shown below. The second example assumes that you do not redeem and instead keep your shares.

If Shares Are Redeemed

Expense Example Lord Abbett Classic Stock Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	669	916	1,199	2,003
Class B	666	863	1,203	2,057
Class C	266	563	1,003	2,226
Class F	75	284	528	1,228
Class I	64	252	474	1,111
Class P	110	393	715	1,627
Class R2	125	440	794	1,794
Class R3	115	409	742	1,683

If Shares Are Not Redeemed

Expense Example No Redemption Lord Abbett Classic Stock Fund (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	669	916	1,199	2,003
Class B	166	563	1,003	2,057
Class C	166	563	1,003	2,226
Class F	75	284	528	1,228
Class I	64	252	474	1,111
Class P	110	393	715	1,627
Class R2	125	440	794	1,794
Class R3	115	409	742	1,683

Portfolio Turnover.

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 27.97% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

To pursue its objective, under normal market conditions, the Fund invests at least 80% of its net assets in equity securities of large, seasoned, U.S. and multinational companies. The Fund invests in the full spectrum of large companies, including those with value or growth characteristics. The Fund may invest in U.S. and foreign (which may include emerging market) companies. Foreign companies may be traded on U.S. or non-U.S. securities exchanges and may include American Depositary Receipts (“ADRs”). The Fund’s investments primarily include the following types of securities and other financial instruments:

• Equity securities, including common stocks, preferred stocks, and equity interests in trusts (including real estate investment trusts), partnerships, joint ventures, and limited liability companies. The Fund considers equity securities to include rights offerings and investments that convert into the equity securities described above.

• Large companies having a market capitalization at the time of purchase that falls within the market capitalization range of companies in the Russell 1000^® Index.

• Value companies that portfolio management believes to be underpriced or undervalued according to certain financial measurements of intrinsic worth or business prospects and have the potential for capital appreciation.

• Growth companies that portfolio management believes exhibit faster-than-average gains in earnings and have the potential to continue profit growth at a high level.

At its discretion and consistent with the Fund’s investment objective, the Fund selectively may use derivatives, including futures, forwards, options, and swaps, to hedge against the decline in value of the Fund’s investments and for other risk management purposes, to efficiently gain targeted investment exposure, and to seek to increase the Fund’s investment returns.

The Fund generally will 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; however, in response to adverse economic, market or other unfavorable conditions, the Fund may invest its assets in a temporary defensive manner.

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:

• Portfolio Management Risk: If the strategies used and securities selected by the Fund’s portfolio management 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 rising market.

• Equity Risk: Common stocks and other equity securities, as well as equity-like securities such as convertible bonds, 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.

• Large Company Risk: As compared to smaller successful companies, larger companies may be less able to respond quickly to certain market developments and may have slower rates of growth.

• Blend Style Risk: The Fund uses a “blend” strategy to invest in both growth and value stocks, or in stocks with characteristics of both. The prices of growth stocks may fall dramatically if the company fails to meet earnings or revenue projections. The prices of value stocks may lag the stock market for long periods of time if the market fails to recognize the company’s intrinsic worth.

• Foreign Company Risk: The Fund’s investment exposure to foreign (which may include emerging market) companies generally is subject to the risk that the value of securities issued by foreign companies may be adversely affected by political, economic and social volatility, lack of transparency or inadequate regulatory and accounting standards, inadequate exchange control regulations, foreign taxes, higher transaction and other costs, and delays in settlement. Because the Fund’s limit on foreign securities focuses on where the security is principally traded rather than where the issuer is organized and/or operated, the percentage of the Fund’s assets that is exposed to foreign market risks may exceed the percentage of the Fund’s assets that the Fund considers to represent foreign securities. Emerging market securities generally are more volatile than other foreign securities, and are subject to greater liquidity, regulatory, and political risks.

• Derivatives Risk: Derivatives are subject to certain risks, including the risk that the value of the derivative may not correlate with the value of the underlying security, rate, or index in the manner anticipated by portfolio management. Derivatives may be more sensitive to changes in economic or market conditions and may become illiquid. Derivatives are subject to leverage risk, which may increase the Fund’s volatility, and counterparty risk, which means that the counterparty may fail to perform its obligations under the derivatives contract.

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.

PERFORMANCE

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.

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 (per calendar year) - Class A Shares*

* The year-to-date return for Class A shares as of June 30, 2012 was 8.44%.

Best Quarter 2nd Q ’03 +18.49% Worst Quarter 4th Q ’08 -19.90%

Average Annual Total Returns (for the periods ended December 31, 2011)

The table below shows how the average annual total returns of the Fund compare to the returns of securities indices. The Fund’s average annual total returns include applicable sales charges as follows: for Class A shares, the current maximum front-end sales charge of 5.75%; for Class B shares, the current CDSC of 4.00% for the one-year period and 1.00% for the five-year period; and for Class C shares, the performance shown is at net asset value (“NAV”) because there is no CDSC for Class C shares for any period one year or greater. There are no sales charges for Class F, I, P, R2, and R3 shares. Class B shares automatically convert to Class A shares at approximately eight years after purchase. All returns for Class B shares for periods greater than eight years reflect this conversion.

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- deferred 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.

Average Annual Returns Lord Abbett Classic Stock Fund	1 Year	5 Years	10 Years	Life of Class	Inception Date for Performance
Class A	(13.63%)	(1.20%)	2.41%
Class A After Taxes on Distributions	(13.74%)	(1.50%)	2.07%
Class A After Taxes on Distributions and Sale of Fund Shares	(8.73%)	(1.01%)	2.07%
Class B	(12.60%)	(0.87%)	2.48%
Class C	(8.94%)	(0.68%)	2.38%
Class F	(8.11%)			(2.51%)	Sep. 28, 2007
Class I	(8.04%)	0.32%	3.38%
Class P	(8.45%)	(0.14%)	2.94%
Class R2	(8.59%)			(2.78%)	Sep. 28, 2007
Class R3	(8.49%)			(2.89%)	Sep. 28, 2007
Russell 1000® Index (reflects no deduction for fees, expenses, or taxes)	1.50%	(0.02%)	3.34%	(2.09%)	Sep. 28, 2007
S&P 500® Index (reflects no deduction for fees, expenses, or taxes)	2.11%	(0.25%)	2.92%	(2.32%)	Sep. 28, 2007

[1] 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.

[2] A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

[1] For the period from September 27, 2012 through March 31, 2014, Lord Abbett has contractually agreed to waive all or a portion of its management fee and administrative services fee and, if necessary, reimburse the Fund's other expenses to the extent necessary so that the total net annual operating expenses for each class, excluding 12b-1 fees, do not exceed an annual rate of 0.63%. This agreement may be terminated only upon the approval of the Fund's Board of Directors.