v3.26.1
Performance Management - Prospectus Summary
Nov. 30, 2025
Lord Abbett Dividend Growth Fund  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] PERFORMANCE
Performance Narrative [Text Block]

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 Past Does Not Indicate Future [Text] 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] 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.
Bar Chart Narrative [Text Block]

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] 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 [Heading] Bar Chart (per calendar year) - Class A Shares
Bar Chart Closing [Text Block]

Best Quarter 2nd Q 2020 +19.16%    Worst Quarter 1st Q 2020 -19.86%
Performance Table Heading Average Annual Total Returns (for the periods ended December 31, 2025)
Performance Table Narrative

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

The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares.
Performance Table Does Reflect Sales Loads The Fund’s average annual total returns include applicable sales charges.
Performance Table Uses Highest Federal Rate 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 The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”).
Performance Table Explanation after Tax Higher 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]
Average Annual Total Returns - Prospectus Summary - Lord Abbett Dividend Growth Fund
 12 Months Ended 60 Months Ended 105 Months Ended 120 Months Ended
Nov. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
S&P 500® Index | Average Annual Return, Label [Optional Text] S&P 500® Index        
S&P 500® Index | Average Annual Return, Percent   17.88% 14.42% 14.86% 14.82%
S&P 500® Index | Performance Inception Date       Apr. 04, 2017  
Class A Shares | Average Annual Return, Percent   9.50% 11.11%   12.45%
Class A Shares | After Taxes on Distributions | Average Annual Return, Percent   8.22% 9.81%   10.83%
Class A Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   6.51% 8.60%   9.78%
Class C Shares | Average Annual Return, Percent [1]   14.31% 11.59%   12.27%
Class F Shares | Average Annual Return, Percent   16.43% 12.72%   13.39%
Class F3 Shares | Average Annual Return, Percent   16.49% 12.78% 13.13%  
Class F3 Shares | Performance Inception Date       Apr. 04, 2017  
Class I Shares | Average Annual Return, Percent   16.42% 12.71%   13.40%
Class P Shares | Average Annual Return, Percent   15.89% 12.21%   12.89%
Class R2 Shares | Average Annual Return, Percent   15.77% 12.04%   12.72%
Class R3 Shares | Average Annual Return, Percent   15.87% 12.14%   12.85%
Class R4 Shares | Average Annual Return, Percent   16.15% 12.44%   13.13%
Class R5 Shares | Average Annual Return, Percent   16.43% 12.71%   13.41%
Class R6 Shares | Average Annual Return, Percent   16.50% 12.77%   13.49%
[1]

Class C shares convert to Class A shares eight years after purchase. Class C share performance does not reflect the impact of such conversion to Class A shares.
Performance Table One Class of after Tax Shown [Text] After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares.
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses, or taxes)
Performance Availability Website Address [Text] www.lordabbett.com
Performance Availability Phone [Text] 888-522-2388
Lord Abbett Dividend Growth Fund | Class A Shares  
Prospectus [Line Items]  
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 19.16%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (19.86%)
Lowest Quarterly Return, Date Mar. 31, 2020
Lord Abbett Growth Opportunities Fund  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] PERFORMANCE
Performance Narrative [Text Block]

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 Past Does Not Indicate Future [Text] 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] 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.
Bar Chart Narrative [Text Block]

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] 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 [Heading] Bar Chart (per calendar year) - Class A Shares
Bar Chart Closing [Text Block]

Best Quarter 2nd Q 2020 +31.78%    Worst Quarter 1st Q 2020 -19.38%
Performance Table Heading Average Annual Total Returns (for the periods ended December 31, 2025)
Performance Table Narrative

The table below shows how the Fund’s average annual total returns compare to the returns of securities market indices with investment characteristics similar to those of the Fund as well as to a broad-based securities market index.1 The Fund’s average annual total returns include applicable sales charges.

The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares.

1The Fund has adopted the S&P 500® Index as its broad-based securities market index.
Performance Table Does Reflect Sales Loads The Fund’s average annual total returns include applicable sales charges.
Performance Table Uses Highest Federal Rate 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 The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”).
Performance Table Explanation after Tax Higher 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]
Average Annual Total Returns - Prospectus Summary - Lord Abbett Growth Opportunities Fund
 12 Months Ended 60 Months Ended 105 Months Ended 120 Months Ended
Nov. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Russell Midcap® Growth Index | Average Annual Return, Label [Optional Text] Russell Midcap® Growth Index        
Russell Midcap® Growth Index | Average Annual Return, Percent   8.66% 6.65% 12.78% 12.49%
Russell Midcap® Growth Index | Performance Inception Date       Apr. 04, 2017  
Russell Midcap® Index | Average Annual Return, Label [Optional Text] Russell Midcap® Index        
Russell Midcap® Index | Average Annual Return, Percent   10.60% 8.67% 10.49% 11.01%
Russell Midcap® Index | Performance Inception Date       Apr. 04, 2017  
S&P 500® Index | Average Annual Return, Label [Optional Text] S&P 500® Index        
S&P 500® Index | Average Annual Return, Percent   17.88% 14.42% 14.86% 14.82%
S&P 500® Index | Performance Inception Date       Apr. 04, 2017  
Class A Shares | Average Annual Return, Percent   6.74% 2.13%   9.83%
Class A Shares | After Taxes on Distributions | Average Annual Return, Percent   4.94% 0.93%   8.16%
Class A Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   5.26% 1.52%   7.65%
Class C Shares | Average Annual Return, Percent [1]   11.44% 2.58%   9.65%
Class F Shares | Average Annual Return, Percent   13.46% 3.50%   10.64%
Class F3 Shares | Average Annual Return, Percent   13.68% 3.70% 11.55%  
Class F3 Shares | Performance Inception Date       Apr. 04, 2017  
Class I Shares | Average Annual Return, Percent   13.57% 3.61%   10.76%
Class P Shares | Average Annual Return, Percent   13.07% 3.15%   10.26%
Class R2 Shares | Average Annual Return, Percent   12.86% 2.99%   10.10%
Class R3 Shares | Average Annual Return, Percent   12.99% 3.10%   10.21%
Class R4 Shares | Average Annual Return, Percent   13.27% 3.36%   10.48%
Class R5 Shares | Average Annual Return, Percent   13.54% 3.62%   10.77%
Class R6 Shares | Average Annual Return, Percent   13.69% 3.70%   10.85%
[1]

Class C shares convert to Class A shares eight years after purchase. Class C share performance does not reflect the impact of such conversion to Class A shares.
Performance Table One Class of after Tax Shown [Text] After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares.
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses, or taxes)
Performance Availability Website Address [Text] www.lordabbett.com
Performance Availability Phone [Text] 888-522-2388
Lord Abbett Growth Opportunities Fund | Class A Shares  
Prospectus [Line Items]  
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 31.78%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (19.38%)
Lowest Quarterly Return, Date Mar. 31, 2020
Small-Cap Value Series  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] PERFORMANCE
Performance Narrative [Text Block]

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 Past Does Not Indicate Future [Text] 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] 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.
Bar Chart Narrative [Text Block]

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] 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 [Heading] Bar Chart (per calendar year) - Class A Shares
Bar Chart Closing [Text Block]

Best Quarter 4th Q 2020 +29.79%    Worst Quarter 1st Q 2020 -37.69%
Performance Table Heading Average Annual Total Returns (for the periods ended December 31, 2025)
Performance Table Narrative

The table below shows how the Fund’s average annual total returns compare to the returns of a securities market index with investment characteristics similar to those of the Fund as well as to a broad-based securities market index.1 The Fund’s average annual total returns include applicable sales charges.

The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares.

1The Fund has adopted the S&P 500® Index as its broad-based securities market index.
Performance Table Does Reflect Sales Loads The Fund’s average annual total returns include applicable sales charges.
Performance Table Uses Highest Federal Rate 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 The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”).
Performance Table Explanation after Tax Higher 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]
Average Annual Total Returns - Prospectus Summary - Small-Cap Value Series
 12 Months Ended 60 Months Ended 105 Months Ended 120 Months Ended
Nov. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Russell 2000® Value Index | Average Annual Return, Label [Optional Text] Russell 2000® Value Index        
Russell 2000® Value Index | Average Annual Return, Percent   12.59% 8.88% 7.39% 9.27%
Russell 2000® Value Index | Performance Inception Date       Apr. 04, 2017  
S&P 500® Index | Average Annual Return, Label [Optional Text] S&P 500® Index        
S&P 500® Index | Average Annual Return, Percent   17.88% 14.42% 14.86% 14.82%
S&P 500® Index | Performance Inception Date       Apr. 04, 2017  
Class A Shares | Average Annual Return, Percent   (5.18%) 5.98%   5.98%
Class A Shares | After Taxes on Distributions | Average Annual Return, Percent   (6.57%) 4.18%   3.59%
Class A Shares | After Taxes on Distributions and Sales | Average Annual Return, Percent   (2.05%) 4.52%   4.33%
Class C Shares | Average Annual Return, Percent [1]   (0.52%) 6.47%   5.82%
Class F Shares | Average Annual Return, Percent   0.74% 7.40%   6.77%
Class F3 Shares | Average Annual Return, Percent   0.95% 7.60% 5.75%  
Class F3 Shares | Performance Inception Date       Apr. 04, 2017  
Class I Shares | Average Annual Return, Percent   0.86% 7.52%   6.88%
Class P Shares | Average Annual Return, Percent   0.44% 7.03%   6.40%
Class R2 Shares | Average Annual Return, Percent   0.35% 6.88%   6.25%
Class R3 Shares | Average Annual Return, Percent   0.36% 6.98%   6.35%
Class R4 Shares | Average Annual Return, Percent   0.62% 7.25%   6.62%
Class R5 Shares | Average Annual Return, Percent   0.91% 7.52%   6.89%
Class R6 Shares | Average Annual Return, Percent   0.95% 7.60%   6.97%
[1]

Class C shares convert to Class A shares eight years after purchase. Class C share performance does not reflect the impact of such conversion to Class A shares.
Performance Table One Class of after Tax Shown [Text] After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares.
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses, or taxes)
Performance Availability Website Address [Text] www.lordabbett.com
Performance Availability Phone [Text] 888-522-2388
Small-Cap Value Series | Class A Shares  
Prospectus [Line Items]  
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 29.79%
Highest Quarterly Return, Date Dec. 31, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (37.69%)
Lowest Quarterly Return, Date Mar. 31, 2020