485BPOS

1933 Act File No. 333-88103
1940 Act File No. 811-09597

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. 18	x
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	x
Amendment No. 19	x

LORD ABBETT STOCK APPRECIATION FUND

(Exact Name of Registrant as Specified in Charter)

	90 Hudson Street, Jersey City, New Jersey	07302-3973
	(Address of Principal Executive Office)	(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 of this Registration Statement under Rule 485(b) under the Securities Act and has duly caused this 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 18^th day of December, 2012.

LORD ABBETT STOCK APPRECIATION FUND
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, as amended, 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 Trustee	December 18, 2012
Robert S. Dow
/s/ Daria L. Foster*	President and Trustee	December 18, 2012
Daria L. Foster
/s/ E. Thayer Bigelow*	Trustee	December 18, 2012
E. Thayer Bigelow
/s/ Robert B. Calhoun, Jr. *	Trustee	December 18, 2012
Robert B. Calhoun, Jr.
/s/ Evelyn E. Guernsey*	Trustee	December 18, 2012
Evelyn E. Guernsey
/s/ Julie A. Hill*	Trustee	December 18, 2012
Julie A. Hill
/s/ Franklin W. Hobbs*	Trustee	December 18, 2012
Franklin W. Hobbs
	Trustee
James M. McTaggart
/s/ Thomas J. Neff*	Trustee	December 18, 2012
Thomas J. Neff
/s/ James L.L. Tullis*	Trustee	December 18, 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		April 19, 2012
Robert S. Dow	and Director/Trustee
/s/ Daria L. Foster	President and		April 19, 2012
Daria L. Foster	Director/Trustee
/s/ E. Thayer Bigelow	Director/Trustee
E. Thayer Bigelow			April 19, 2012
/s/ Robert B. Calhoun, Jr.	Director/Trustee
Robert B. Calhoun, Jr.			April 19, 2012
/s/ Evelyn E. Guernsey	Director/Trustee
Evelyn E. Guernsey			April 19, 2012
/s/ Julie A. Hill	Director/Trustee
Julie A. Hill			April 19, 2012
/s/ Franklin W. Hobbs	Director/Trustee
Franklin W. Hobbs			April 19, 2012
/s/ Thomas J. Neff	Director/Trustee
Thomas J. Neff			April 19, 2012
/s/ James L .L. Tullis	Director/Trustee
James L. L. Tullis			April 19, 2012

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 Value 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

LORD ABBETT STOCK APPRECIATION FUND

Objective [Heading]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

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

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 24 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

2013-11-30

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 110.79% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

110.79%

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 fee waiver and expense limitation 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, the Fund invests primarily in equity securities of large companies. The Fund seeks to invest in well-run companies with strong management. The Fund seeks to identify individual companies with expected earnings growth potential that may not be recognized by the market at large. The Fund attempts to identify large-capitalization companies with a growth rate above the growth rate of the U.S. economy. The Fund focuses on companies demonstrating the following attributes: successful strategy and execution; strong management leadership; and anticipated favorable earnings projections.

Under normal market conditions, the Fund invests at least 80% of its net assets in equity securities of large companies. In selecting investments, 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”). Although the Fund is diversified across many industries and sectors, its assets may, from time to time, be overweighted or underweighted to certain industries and sectors relative to its benchmark index. The Fund’s principal investments include the following types of securities and other financial instruments:

• Equity securities usually include common stocks, but also may include preferred stocks, convertible securities, and equity interests in trusts, partnerships, and limited liability companies. The Fund also may invest in securities that are tied to the price of stock, including rights and convertible debt securities.

• 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.

• Growth companies that the Fund believes exhibit growth rates above the growth rate of the U.S. economy.

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: The Fund invests primarily in equity securities of large companies, which may not rise in value as rapidly as small companies (or at all) during periods of economic growth and which can be slower to innovate than small companies.

• Growth Investing Risk: The Fund uses a growth investing style, which may be out of favor or may not produce the best results over short or longer time periods. In addition, growth stocks tend to be more volatile than slower-growing value stocks.

• Foreign Company Risk: The Fund’s investments in foreign (including emerging market) companies and in U.S. companies with economic ties to foreign markets generally involve special risks that can increase the likelihood that the Fund will lose money. For example, as compared with companies organized and operated in the U.S., these companies may be more vulnerable to economic, political, and social instability and subject to less government supervision, inadequate regulatory and accounting standards, and foreign taxes. In addition, the securities of foreign companies also may be subject to inadequate exchange control regulations, higher transaction and other costs, reduced liquidity, and delays in settlement to the extent they are traded on non-U.S. exchanges or markets. Emerging market securities generally are more volatile than other foreign securities, and are subject to greater liquidity, regulatory, and political risks.

• Industry/Sector Risk: To the extent the Fund overweights a single market sector or industry relative to its benchmark index, it can accumulate relatively large positions in a single issuer, industry, or sector. As a result, the Fund’s performance may be tied more directly to the success or failure of a relatively smaller or less diversified group of portfolio holdings.

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 Fund – Principal Risks” section in the prospectus.

Risk Lose Money [Text]

rr_RiskLoseMoney

As with any invesment 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 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 total return for the Fund’s Class A shares for the nine-month period from January 1, 2012 to September 30, 2012 was +14.78%.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Best Quarter 3rd Q ’09 +14.01% Worst Quarter 2nd Q ’02 -22.00%

Year to Date Return, Label

rr_YearToDateReturnLabel

The total return for the Fund's Class A shares for the nine-month period from January 1, 2012 to September 30, 2012 was +14.78%.

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

14.78%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter:

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

14.01%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter:

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Jun. 30, 2002

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(22.00%)

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.

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 Fund’s average annual total returns compare to the returns of a securities index. The Fund’s average annual total returns include applicable sales charges.

The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax- 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® Growth Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

2.64%

5 Years

rr_AverageAnnualReturnYear05

2.50%

10 Years

rr_AverageAnnualReturnYear10

2.60%

Life of Class

rr_AverageAnnualReturnSinceInception

0.10%

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%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.35%

Other Expenses

rr_OtherExpensesOverAssets

0.40%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.50%

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.05%)

^[2]

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

rr_NetExpensesOverAssets

1.45%

^[2]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

714

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,017

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,342

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,259

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

714

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

1,017

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,342

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,259

Annual Return 2002

rr_AnnualReturn2002

(35.31%)

Annual Return 2003

rr_AnnualReturn2003

27.82%

Annual Return 2004

rr_AnnualReturn2004

3.29%

Annual Return 2005

rr_AnnualReturn2005

7.55%

Annual Return 2006

rr_AnnualReturn2006

4.62%

Annual Return 2007

rr_AnnualReturn2007

15.19%

Annual Return 2008

rr_AnnualReturn2008

(39.11%)

Annual Return 2009

rr_AnnualReturn2009

29.47%

Annual Return 2010

rr_AnnualReturn2010

17.32%

Annual Return 2011

rr_AnnualReturn2011

(9.12%)

1 Year

rr_AverageAnnualReturnYear01

(14.38%)

5 Years

rr_AverageAnnualReturnYear05

(1.83%)

10 Years

rr_AverageAnnualReturnYear10

(1.31%)

Class A | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(14.38%)

5 Years

rr_AverageAnnualReturnYear05

(1.83%)

10 Years

rr_AverageAnnualReturnYear10

(1.31%)

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

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(9.34%)

5 Years

rr_AverageAnnualReturnYear05

(1.55%)

10 Years

rr_AverageAnnualReturnYear10

(1.10%)

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

0.40%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.15%

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.05%)

^[2]

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

rr_NetExpensesOverAssets

2.10%

^[2]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

713

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

968

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,350

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,314

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

213

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

668

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,150

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,314

1 Year

rr_AverageAnnualReturnYear01

(14.13%)

5 Years

rr_AverageAnnualReturnYear05

(1.65%)

10 Years

rr_AverageAnnualReturnYear10

(1.22%)

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

0.75%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.40%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.15%

^[4]

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.05%)

^[2]

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

rr_NetExpensesOverAssets

2.10%

^[2],[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

313

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

668

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,150

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,479

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

213

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

668

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,150

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,479

1 Year

rr_AverageAnnualReturnYear01

(10.69%)

5 Years

rr_AverageAnnualReturnYear05

(1.29%)

10 Years

rr_AverageAnnualReturnYear10

(1.35%)

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

0.40%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.25%

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.05%)

^[2]

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

rr_NetExpensesOverAssets

1.20%

^[2]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

122

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

392

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

682

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,507

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

122

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

392

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

682

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,507

1 Year

rr_AverageAnnualReturnYear01

(9.03%)

Life of Class

rr_AverageAnnualReturnSinceInception

(3.79%)

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

0.40%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.15%

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.05%)

^[2]

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

rr_NetExpensesOverAssets

1.10%

^[2]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

112

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

360

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

628

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,393

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

112

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

360

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

628

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,393

1 Year

rr_AverageAnnualReturnYear01

(8.79%)

5 Years

rr_AverageAnnualReturnYear05

(0.28%)

10 Years

rr_AverageAnnualReturnYear10

(0.47%)

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

0.40%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.60%

^[4]

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.05%)

^[2]

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

rr_NetExpensesOverAssets

1.55%

^[2],[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

158

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

500

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

866

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,896

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

158

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

500

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

866

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,896

1 Year

rr_AverageAnnualReturnYear01

(9.05%)

5 Years

rr_AverageAnnualReturnYear05

(0.60%)

10 Years

rr_AverageAnnualReturnYear10

(0.63%)

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

0.40%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.75%

^[4]

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.05%)

^[2]

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

rr_NetExpensesOverAssets

1.70%

^[2],[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

173

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

546

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

944

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,058

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

173

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

546

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

944

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,058

1 Year

rr_AverageAnnualReturnYear01

(8.69%)

Life of Class

rr_AverageAnnualReturnSinceInception

(3.67%)

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

0.40%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.65%

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.05%)

^[2]

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

rr_NetExpensesOverAssets

1.60%

^[2],[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

163

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

515

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

892

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,950

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

163

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

515

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

892

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,950

1 Year

rr_AverageAnnualReturnYear01

(9.32%)

Life of Class

rr_AverageAnnualReturnSinceInception

(4.16%)

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 December 1, 2012 through November 30, 2013, Lord Abbett has contractually agreed to waive its fees and reimburse expenses to the extent necessary to limit total net annual operating expenses for each class, excluding 12b-1 fees, to an annual rate of 1.10%. This agreement may be terminated only by the Fund's Board of Trustees.

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

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

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LORD ABBETT STOCK APPRECIATION FUND

LORD ABBETT STOCK APPRECIATION FUND

INVESTMENT OBJECTIVE

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

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 24 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 STOCK APPRECIATION 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)

Operating Expenses LORD ABBETT STOCK APPRECIATION 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		0.35%	1.00%	1.00%		0.10%	none	0.45%		0.60%		0.50%
Other Expenses		0.40%	0.40%	0.40%		0.40%	0.40%	0.40%		0.40%		0.40%
Total Annual Fund Operating Expenses		1.50%	2.15%	2.15%	[1]	1.25%	1.15%	1.60%	[1]	1.75%	[1]	1.65%
Fee Waiver and/or Expense Reimbursement	[2]	(0.05%)	(0.05%)	(0.05%)		(0.05%)	(0.05%)	(0.05%)		(0.05%)		(0.05%)
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	[2]	1.45%	2.10%	2.10%	[1]	1.20%	1.10%	1.55%	[1]	1.70%	[1]	1.60%	[1]

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 fee waiver and expense limitation 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 STOCK APPRECIATION FUND (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	714	1,017	1,342	2,259
Class B	713	968	1,350	2,314
Class C	313	668	1,150	2,479
Class F	122	392	682	1,507
Class I	112	360	628	1,393
Class P	158	500	866	1,896
Class R2	173	546	944	2,058
Class R3	163	515	892	1,950

If Shares Are Not Redeemed

Expense Example No Redemption LORD ABBETT STOCK APPRECIATION FUND (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	714	1,017	1,342	2,259
Class B	213	668	1,150	2,314
Class C	213	668	1,150	2,479
Class F	122	392	682	1,507
Class I	112	360	628	1,393
Class P	158	500	866	1,896
Class R2	173	546	944	2,058
Class R3	163	515	892	1,950

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 110.79% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

To pursue its objective, the Fund invests primarily in equity securities of large companies. The Fund seeks to invest in well-run companies with strong management. The Fund seeks to identify individual companies with expected earnings growth potential that may not be recognized by the market at large. The Fund attempts to identify large-capitalization companies with a growth rate above the growth rate of the U.S. economy. The Fund focuses on companies demonstrating the following attributes: successful strategy and execution; strong management leadership; and anticipated favorable earnings projections.

Under normal market conditions, the Fund invests at least 80% of its net assets in equity securities of large companies. In selecting investments, 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”). Although the Fund is diversified across many industries and sectors, its assets may, from time to time, be overweighted or underweighted to certain industries and sectors relative to its benchmark index. The Fund’s principal investments include the following types of securities and other financial instruments:

• Equity securities usually include common stocks, but also may include preferred stocks, convertible securities, and equity interests in trusts, partnerships, and limited liability companies. The Fund also may invest in securities that are tied to the price of stock, including rights and convertible debt securities.

• 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.

• Growth companies that the Fund believes exhibit growth rates above the growth rate of the U.S. economy.

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: The Fund invests primarily in equity securities of large companies, which may not rise in value as rapidly as small companies (or at all) during periods of economic growth and which can be slower to innovate than small companies.

• Growth Investing Risk: The Fund uses a growth investing style, which may be out of favor or may not produce the best results over short or longer time periods. In addition, growth stocks tend to be more volatile than slower-growing value stocks.

• Foreign Company Risk: The Fund’s investments in foreign (including emerging market) companies and in U.S. companies with economic ties to foreign markets generally involve special risks that can increase the likelihood that the Fund will lose money. For example, as compared with companies organized and operated in the U.S., these companies may be more vulnerable to economic, political, and social instability and subject to less government supervision, inadequate regulatory and accounting standards, and foreign taxes. In addition, the securities of foreign companies also may be subject to inadequate exchange control regulations, higher transaction and other costs, reduced liquidity, and delays in settlement to the extent they are traded on non-U.S. exchanges or markets. Emerging market securities generally are more volatile than other foreign securities, and are subject to greater liquidity, regulatory, and political risks.

• Industry/Sector Risk: To the extent the Fund overweights a single market sector or industry relative to its benchmark index, it can accumulate relatively large positions in a single issuer, industry, or sector. As a result, the Fund’s performance may be tied more directly to the success or failure of a relatively smaller or less diversified group of portfolio holdings.

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 Fund – 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 total return for the Fund’s Class A shares for the nine-month period from January 1, 2012 to September 30, 2012 was +14.78%.

Best Quarter 3rd Q ’09 +14.01% Worst Quarter 2nd Q ’02 -22.00%

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

The table below shows how the Fund’s average annual total returns compare to the returns of a securities index. The Fund’s average annual total returns include applicable sales charges.

The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax- 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 STOCK APPRECIATION FUND	1 Year	5 Years	10 Years	Life of Class	Inception Date for Performance
Class A	(14.38%)	(1.83%)	(1.31%)
Class A After Taxes on Distributions	(14.38%)	(1.83%)	(1.31%)
Class A After Taxes on Distributions and Sale of Fund Shares	(9.34%)	(1.55%)	(1.10%)
Class B	(14.13%)	(1.65%)	(1.22%)
Class C	(10.69%)	(1.29%)	(1.35%)
Class F	(9.03%)			(3.79%)	Sep. 28, 2007
Class I	(8.79%)	(0.28%)	(0.47%)
Class P	(9.05%)	(0.60%)	(0.63%)
Class R2	(8.69%)			(3.67%)	Sep. 28, 2007
Class R3	(9.32%)			(4.16%)	Sep. 28, 2007
Russell 1000® Growth Index (reflects no deduction for fees, expenses, or taxes)	2.64%	2.50%	2.60%	0.10%	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 December 1, 2012 through November 30, 2013, Lord Abbett has contractually agreed to waive its fees and reimburse expenses to the extent necessary to limit total net annual operating expenses for each class, excluding 12b-1 fees, to an annual rate of 1.10%. This agreement may be terminated only by the Fund's Board of Trustees.

XML

Document and Entity Information	0 Months Ended
	Jul. 31, 2012
Risk/Return:
Document Type	485BPOS
Document Period End Date	Jul. 31, 2012
Registrant Name	LORD ABBETT STOCK APPRECIATION FUND
Central Index Key	0001095664
Amendment Flag	false
Document Creation Date	Nov. 27, 2012
Document Effective Date	Dec. 01, 2012
Prospectus Date	Dec. 01, 2012

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Prospectus Date	rr_ProspectusDate	Dec. 01, 2012