This semi-annual shareholder report contains important information about the Lord Abbett Core Fixed Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 20px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">lordabbett.com/FundDocuments</span>

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$28	0.55%

Expenses Paid, Amount

$ 28

Expense Ratio, Percent

0.55%

AssetsNet

$ 4,520,473,782

Holdings Count | Holding

479

Advisory Fees Paid, Amount

$ 4,709,833

InvestmentCompanyPortfolioTurnover

229.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,520,473,782
# of Portfolio Holdings	479
Portfolio Turnover Rate	229%
Total Advisory Fees Paid	$4,709,833

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.74%
Corporate Bonds	30.29%
Floating Rate Loans	1.15%
Foreign Government Obligations	0.29%
Government Agency Obligation	0.41%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.63%
Government Sponsored Enterprises Pass-Throughs	25.02%
Municipal Bonds	0.06%
Non-Agency Commercial Mortgage-Backed Securities	9.10%
U.S. Treasury Obligations	19.85%
Repurchase Agreements	0.37%
Money Market Funds^{Footnote Reference(a)}	0.08%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000019982

Shareholder Report [Line Items]

Fund Name

Lord Abbett Core Fixed Income Fund

Class Name

Class C

Trading Symbol

LCRCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Core Fixed Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$61	1.22%

Expenses Paid, Amount

$ 61

Expense Ratio, Percent

1.22%

AssetsNet

$ 4,520,473,782

Holdings Count | Holding

479

Advisory Fees Paid, Amount

$ 4,709,833

InvestmentCompanyPortfolioTurnover

229.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,520,473,782
# of Portfolio Holdings	479
Portfolio Turnover Rate	229%
Total Advisory Fees Paid	$4,709,833

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.74%
Corporate Bonds	30.29%
Floating Rate Loans	1.15%
Foreign Government Obligations	0.29%
Government Agency Obligation	0.41%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.63%
Government Sponsored Enterprises Pass-Throughs	25.02%
Municipal Bonds	0.06%
Non-Agency Commercial Mortgage-Backed Securities	9.10%
U.S. Treasury Obligations	19.85%
Repurchase Agreements	0.37%
Money Market Funds^{Footnote Reference(a)}	0.08%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054885

Shareholder Report [Line Items]

Fund Name

Lord Abbett Core Fixed Income Fund

Class Name

Class F

Trading Symbol

LCRFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Core Fixed Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F	$23	0.45%

Expenses Paid, Amount

$ 23

Expense Ratio, Percent

0.45%

AssetsNet

$ 4,520,473,782

Holdings Count | Holding

479

Advisory Fees Paid, Amount

$ 4,709,833

InvestmentCompanyPortfolioTurnover

229.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,520,473,782
# of Portfolio Holdings	479
Portfolio Turnover Rate	229%
Total Advisory Fees Paid	$4,709,833

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.74%
Corporate Bonds	30.29%
Floating Rate Loans	1.15%
Foreign Government Obligations	0.29%
Government Agency Obligation	0.41%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.63%
Government Sponsored Enterprises Pass-Throughs	25.02%
Municipal Bonds	0.06%
Non-Agency Commercial Mortgage-Backed Securities	9.10%
U.S. Treasury Obligations	19.85%
Repurchase Agreements	0.37%
Money Market Funds^{Footnote Reference(a)}	0.08%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000188234

Shareholder Report [Line Items]

Fund Name

Lord Abbett Core Fixed Income Fund

Class Name

Class F3

Trading Symbol

LCROX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Core Fixed Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F3	$14	0.28%

Expenses Paid, Amount

$ 14

Expense Ratio, Percent

0.28%

AssetsNet

$ 4,520,473,782

Holdings Count | Holding

479

Advisory Fees Paid, Amount

$ 4,709,833

InvestmentCompanyPortfolioTurnover

229.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,520,473,782
# of Portfolio Holdings	479
Portfolio Turnover Rate	229%
Total Advisory Fees Paid	$4,709,833

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.74%
Corporate Bonds	30.29%
Floating Rate Loans	1.15%
Foreign Government Obligations	0.29%
Government Agency Obligation	0.41%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.63%
Government Sponsored Enterprises Pass-Throughs	25.02%
Municipal Bonds	0.06%
Non-Agency Commercial Mortgage-Backed Securities	9.10%
U.S. Treasury Obligations	19.85%
Repurchase Agreements	0.37%
Money Market Funds^{Footnote Reference(a)}	0.08%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000019984

Shareholder Report [Line Items]

Fund Name

Lord Abbett Core Fixed Income Fund

Class Name

Class I

Trading Symbol

LCRYX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Core Fixed Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$16	0.31%

Expenses Paid, Amount

$ 16

Expense Ratio, Percent

0.31%

AssetsNet

$ 4,520,473,782

Holdings Count | Holding

479

Advisory Fees Paid, Amount

$ 4,709,833

InvestmentCompanyPortfolioTurnover

229.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,520,473,782
# of Portfolio Holdings	479
Portfolio Turnover Rate	229%
Total Advisory Fees Paid	$4,709,833

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.74%
Corporate Bonds	30.29%
Floating Rate Loans	1.15%
Foreign Government Obligations	0.29%
Government Agency Obligation	0.41%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.63%
Government Sponsored Enterprises Pass-Throughs	25.02%
Municipal Bonds	0.06%
Non-Agency Commercial Mortgage-Backed Securities	9.10%
U.S. Treasury Obligations	19.85%
Repurchase Agreements	0.37%
Money Market Funds^{Footnote Reference(a)}	0.08%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054886

Shareholder Report [Line Items]

Fund Name

Lord Abbett Core Fixed Income Fund

Class Name

Class R2

Trading Symbol

LCRQX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Core Fixed Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R2	$47	0.95%

Expenses Paid, Amount

$ 47

Expense Ratio, Percent

0.95%

AssetsNet

$ 4,520,473,782

Holdings Count | Holding

479

Advisory Fees Paid, Amount

$ 4,709,833

InvestmentCompanyPortfolioTurnover

229.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,520,473,782
# of Portfolio Holdings	479
Portfolio Turnover Rate	229%
Total Advisory Fees Paid	$4,709,833

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.74%
Corporate Bonds	30.29%
Floating Rate Loans	1.15%
Foreign Government Obligations	0.29%
Government Agency Obligation	0.41%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.63%
Government Sponsored Enterprises Pass-Throughs	25.02%
Municipal Bonds	0.06%
Non-Agency Commercial Mortgage-Backed Securities	9.10%
U.S. Treasury Obligations	19.85%
Repurchase Agreements	0.37%
Money Market Funds^{Footnote Reference(a)}	0.08%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054887

Shareholder Report [Line Items]

Fund Name

Lord Abbett Core Fixed Income Fund

Class Name

Class R3

Trading Symbol

LCRRX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Core Fixed Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R3	$43	0.85%

Expenses Paid, Amount

$ 43

Expense Ratio, Percent

0.85%

AssetsNet

$ 4,520,473,782

Holdings Count | Holding

479

Advisory Fees Paid, Amount

$ 4,709,833

InvestmentCompanyPortfolioTurnover

229.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,520,473,782
# of Portfolio Holdings	479
Portfolio Turnover Rate	229%
Total Advisory Fees Paid	$4,709,833

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.74%
Corporate Bonds	30.29%
Floating Rate Loans	1.15%
Foreign Government Obligations	0.29%
Government Agency Obligation	0.41%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.63%
Government Sponsored Enterprises Pass-Throughs	25.02%
Municipal Bonds	0.06%
Non-Agency Commercial Mortgage-Backed Securities	9.10%
U.S. Treasury Obligations	19.85%
Repurchase Agreements	0.37%
Money Market Funds^{Footnote Reference(a)}	0.08%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156620

Shareholder Report [Line Items]

Fund Name

Lord Abbett Core Fixed Income Fund

Class Name

Class R4

Trading Symbol

LCRSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Core Fixed Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R4	$30	0.60%

Expenses Paid, Amount

$ 30

Expense Ratio, Percent

0.60%

AssetsNet

$ 4,520,473,782

Holdings Count | Holding

479

Advisory Fees Paid, Amount

$ 4,709,833

InvestmentCompanyPortfolioTurnover

229.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,520,473,782
# of Portfolio Holdings	479
Portfolio Turnover Rate	229%
Total Advisory Fees Paid	$4,709,833

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.74%
Corporate Bonds	30.29%
Floating Rate Loans	1.15%
Foreign Government Obligations	0.29%
Government Agency Obligation	0.41%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.63%
Government Sponsored Enterprises Pass-Throughs	25.02%
Municipal Bonds	0.06%
Non-Agency Commercial Mortgage-Backed Securities	9.10%
U.S. Treasury Obligations	19.85%
Repurchase Agreements	0.37%
Money Market Funds^{Footnote Reference(a)}	0.08%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156621

Shareholder Report [Line Items]

Fund Name

Lord Abbett Core Fixed Income Fund

Class Name

Class R5

Trading Symbol

LCRTX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Core Fixed Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R5	$18	0.35%

Expenses Paid, Amount

$ 18

Expense Ratio, Percent

0.35%

AssetsNet

$ 4,520,473,782

Holdings Count | Holding

479

Advisory Fees Paid, Amount

$ 4,709,833

InvestmentCompanyPortfolioTurnover

229.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,520,473,782
# of Portfolio Holdings	479
Portfolio Turnover Rate	229%
Total Advisory Fees Paid	$4,709,833

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.74%
Corporate Bonds	30.29%
Floating Rate Loans	1.15%
Foreign Government Obligations	0.29%
Government Agency Obligation	0.41%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.63%
Government Sponsored Enterprises Pass-Throughs	25.02%
Municipal Bonds	0.06%
Non-Agency Commercial Mortgage-Backed Securities	9.10%
U.S. Treasury Obligations	19.85%
Repurchase Agreements	0.37%
Money Market Funds^{Footnote Reference(a)}	0.08%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156622

Shareholder Report [Line Items]

Fund Name

Lord Abbett Core Fixed Income Fund

Class Name

Class R6

Trading Symbol

LCRVX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Core Fixed Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$14	0.28%

Expenses Paid, Amount

$ 14

Expense Ratio, Percent

0.28%

AssetsNet

$ 4,520,473,782

Holdings Count | Holding

479

Advisory Fees Paid, Amount

$ 4,709,833

InvestmentCompanyPortfolioTurnover

229.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,520,473,782
# of Portfolio Holdings	479
Portfolio Turnover Rate	229%
Total Advisory Fees Paid	$4,709,833

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.74%
Corporate Bonds	30.29%
Floating Rate Loans	1.15%
Foreign Government Obligations	0.29%
Government Agency Obligation	0.41%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.63%
Government Sponsored Enterprises Pass-Throughs	25.02%
Municipal Bonds	0.06%
Non-Agency Commercial Mortgage-Backed Securities	9.10%
U.S. Treasury Obligations	19.85%
Repurchase Agreements	0.37%
Money Market Funds^{Footnote Reference(a)}	0.08%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000019975

Shareholder Report [Line Items]

Fund Name

Lord Abbett Convertible Fund

Class Name

Class A

Trading Symbol

LACFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Convertible Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$55	1.10%

Expenses Paid, Amount

$ 55

Expense Ratio, Percent

1.10%

AssetsNet

$ 557,828,701

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,987,906

InvestmentCompanyPortfolioTurnover

69.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$557,828,701
# of Portfolio Holdings	74
Portfolio Turnover Rate	69%
Total Advisory Fees Paid	$1,987,906

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Convertible Bonds	80.79%
Convertible Preferred Stocks	15.24%
Options Purchased	1.35%
Repurchase Agreements	2.62%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000019977

Shareholder Report [Line Items]

Fund Name

Lord Abbett Convertible Fund

Class Name

Class C

Trading Symbol

LACCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Convertible Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$85	1.71%

Expenses Paid, Amount

$ 85

Expense Ratio, Percent

1.71%

AssetsNet

$ 557,828,701

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,987,906

InvestmentCompanyPortfolioTurnover

69.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$557,828,701
# of Portfolio Holdings	74
Portfolio Turnover Rate	69%
Total Advisory Fees Paid	$1,987,906

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Convertible Bonds	80.79%
Convertible Preferred Stocks	15.24%
Options Purchased	1.35%
Repurchase Agreements	2.62%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054882

Shareholder Report [Line Items]

Fund Name

Lord Abbett Convertible Fund

Class Name

Class F

Trading Symbol

LBFFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Convertible Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F	$50	1.00%

Expenses Paid, Amount

$ 50

Expense Ratio, Percent

1.00%

AssetsNet

$ 557,828,701

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,987,906

InvestmentCompanyPortfolioTurnover

69.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$557,828,701
# of Portfolio Holdings	74
Portfolio Turnover Rate	69%
Total Advisory Fees Paid	$1,987,906

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Convertible Bonds	80.79%
Convertible Preferred Stocks	15.24%
Options Purchased	1.35%
Repurchase Agreements	2.62%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000188232

Shareholder Report [Line Items]

Fund Name

Lord Abbett Convertible Fund

Class Name

Class F3

Trading Symbol

LOCFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Convertible Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F3	$40	0.81%

Expenses Paid, Amount

$ 40

Expense Ratio, Percent

0.81%

AssetsNet

$ 557,828,701

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,987,906

InvestmentCompanyPortfolioTurnover

69.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$557,828,701
# of Portfolio Holdings	74
Portfolio Turnover Rate	69%
Total Advisory Fees Paid	$1,987,906

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Convertible Bonds	80.79%
Convertible Preferred Stocks	15.24%
Options Purchased	1.35%
Repurchase Agreements	2.62%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000019979

Shareholder Report [Line Items]

Fund Name

Lord Abbett Convertible Fund

Class Name

Class I

Trading Symbol

LCFYX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Convertible Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$45	0.90%

Expenses Paid, Amount

$ 45

Expense Ratio, Percent

0.90%

AssetsNet

$ 557,828,701

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,987,906

InvestmentCompanyPortfolioTurnover

69.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$557,828,701
# of Portfolio Holdings	74
Portfolio Turnover Rate	69%
Total Advisory Fees Paid	$1,987,906

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Convertible Bonds	80.79%
Convertible Preferred Stocks	15.24%
Options Purchased	1.35%
Repurchase Agreements	2.62%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000019978

Shareholder Report [Line Items]

Fund Name

Lord Abbett Convertible Fund

Class Name

Class P

Trading Symbol

LCFPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Convertible Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class P	$65	1.31%

Expenses Paid, Amount

$ 65

Expense Ratio, Percent

1.31%

AssetsNet

$ 557,828,701

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,987,906

InvestmentCompanyPortfolioTurnover

69.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$557,828,701
# of Portfolio Holdings	74
Portfolio Turnover Rate	69%
Total Advisory Fees Paid	$1,987,906

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Convertible Bonds	80.79%
Convertible Preferred Stocks	15.24%
Options Purchased	1.35%
Repurchase Agreements	2.62%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054883

Shareholder Report [Line Items]

Fund Name

Lord Abbett Convertible Fund

Class Name

Class R2

Trading Symbol

LBCQX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Convertible Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R2	$75	1.50%

Expenses Paid, Amount

$ 75

Expense Ratio, Percent

1.50%

AssetsNet

$ 557,828,701

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,987,906

InvestmentCompanyPortfolioTurnover

69.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$557,828,701
# of Portfolio Holdings	74
Portfolio Turnover Rate	69%
Total Advisory Fees Paid	$1,987,906

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Convertible Bonds	80.79%
Convertible Preferred Stocks	15.24%
Options Purchased	1.35%
Repurchase Agreements	2.62%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054884

Shareholder Report [Line Items]

Fund Name

Lord Abbett Convertible Fund

Class Name

Class R3

Trading Symbol

LCFRX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Convertible Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R3	$70	1.40%

Expenses Paid, Amount

$ 70

Expense Ratio, Percent

1.40%

AssetsNet

$ 557,828,701

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,987,906

InvestmentCompanyPortfolioTurnover

69.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$557,828,701
# of Portfolio Holdings	74
Portfolio Turnover Rate	69%
Total Advisory Fees Paid	$1,987,906

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Convertible Bonds	80.79%
Convertible Preferred Stocks	15.24%
Options Purchased	1.35%
Repurchase Agreements	2.62%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156617

Shareholder Report [Line Items]

Fund Name

Lord Abbett Convertible Fund

Class Name

Class R4

Trading Symbol

LCFSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Convertible Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R4	$57	1.15%

Expenses Paid, Amount

$ 57

Expense Ratio, Percent

1.15%

AssetsNet

$ 557,828,701

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,987,906

InvestmentCompanyPortfolioTurnover

69.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$557,828,701
# of Portfolio Holdings	74
Portfolio Turnover Rate	69%
Total Advisory Fees Paid	$1,987,906

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Convertible Bonds	80.79%
Convertible Preferred Stocks	15.24%
Options Purchased	1.35%
Repurchase Agreements	2.62%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156618

Shareholder Report [Line Items]

Fund Name

Lord Abbett Convertible Fund

Class Name

Class R5

Trading Symbol

LCFTX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Convertible Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R5	$45	0.90%

Expenses Paid, Amount

$ 45

Expense Ratio, Percent

0.90%

AssetsNet

$ 557,828,701

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,987,906

InvestmentCompanyPortfolioTurnover

69.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$557,828,701
# of Portfolio Holdings	74
Portfolio Turnover Rate	69%
Total Advisory Fees Paid	$1,987,906

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Convertible Bonds	80.79%
Convertible Preferred Stocks	15.24%
Options Purchased	1.35%
Repurchase Agreements	2.62%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156619

Shareholder Report [Line Items]

Fund Name

Lord Abbett Convertible Fund

Class Name

Class R6

Trading Symbol

LCFVX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Convertible Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$40	0.81%

Expenses Paid, Amount

$ 40

Expense Ratio, Percent

0.81%

AssetsNet

$ 557,828,701

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 1,987,906

InvestmentCompanyPortfolioTurnover

69.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$557,828,701
# of Portfolio Holdings	74
Portfolio Turnover Rate	69%
Total Advisory Fees Paid	$1,987,906

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Convertible Bonds	80.79%
Convertible Preferred Stocks	15.24%
Options Purchased	1.35%
Repurchase Agreements	2.62%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000162898

Shareholder Report [Line Items]

Fund Name

Lord Abbett Core Plus Bond Fund

Class Name

Class A

Trading Symbol

LAPLX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Core Plus Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$32	0.63%

Expenses Paid, Amount

$ 32

Expense Ratio, Percent

0.63%

AssetsNet

$ 3,865,232,447

Holdings Count | Holding

687

Advisory Fees Paid, Amount

$ 5,096,324

InvestmentCompanyPortfolioTurnover

226.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,865,232,447
# of Portfolio Holdings	687
Portfolio Turnover Rate	226%
Total Advisory Fees Paid	$5,096,324

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.24%
Corporate Bonds	39.57%
Floating Rate Loans	1.38%
Foreign Government Obligations	0.64%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.90%
Government Sponsored Enterprises Pass-Throughs	21.68%
Municipal Bonds	0.03%
Non-Agency Commercial Mortgage-Backed Securities	7.18%
U.S. Treasury Obligations	15.92%
Repurchase Agreements	0.95%
Money Market Funds^{Footnote Reference(a)}	0.46%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000162899

Shareholder Report [Line Items]

Fund Name

Lord Abbett Core Plus Bond Fund

Class Name

Class C

Trading Symbol

LAPCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Core Plus Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$66	1.32%

Expenses Paid, Amount

$ 66

Expense Ratio, Percent

1.32%

AssetsNet

$ 3,865,232,447

Holdings Count | Holding

687

Advisory Fees Paid, Amount

$ 5,096,324

InvestmentCompanyPortfolioTurnover

226.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,865,232,447
# of Portfolio Holdings	687
Portfolio Turnover Rate	226%
Total Advisory Fees Paid	$5,096,324

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.24%
Corporate Bonds	39.57%
Floating Rate Loans	1.38%
Foreign Government Obligations	0.64%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.90%
Government Sponsored Enterprises Pass-Throughs	21.68%
Municipal Bonds	0.03%
Non-Agency Commercial Mortgage-Backed Securities	7.18%
U.S. Treasury Obligations	15.92%
Repurchase Agreements	0.95%
Money Market Funds^{Footnote Reference(a)}	0.46%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000162900

Shareholder Report [Line Items]

Fund Name

Lord Abbett Core Plus Bond Fund

Class Name

Class F

Trading Symbol

LPLFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Core Plus Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F	$27	0.53%

Expenses Paid, Amount

$ 27

Expense Ratio, Percent

0.53%

AssetsNet

$ 3,865,232,447

Holdings Count | Holding

687

Advisory Fees Paid, Amount

$ 5,096,324

InvestmentCompanyPortfolioTurnover

226.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,865,232,447
# of Portfolio Holdings	687
Portfolio Turnover Rate	226%
Total Advisory Fees Paid	$5,096,324

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.24%
Corporate Bonds	39.57%
Floating Rate Loans	1.38%
Foreign Government Obligations	0.64%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.90%
Government Sponsored Enterprises Pass-Throughs	21.68%
Municipal Bonds	0.03%
Non-Agency Commercial Mortgage-Backed Securities	7.18%
U.S. Treasury Obligations	15.92%
Repurchase Agreements	0.95%
Money Market Funds^{Footnote Reference(a)}	0.46%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000188256

Shareholder Report [Line Items]

Fund Name

Lord Abbett Core Plus Bond Fund

Class Name

Class F3

Trading Symbol

LOPLX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Core Plus Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F3	$18	0.35%

Expenses Paid, Amount

$ 18

Expense Ratio, Percent

0.35%

AssetsNet

$ 3,865,232,447

Holdings Count | Holding

687

Advisory Fees Paid, Amount

$ 5,096,324

InvestmentCompanyPortfolioTurnover

226.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,865,232,447
# of Portfolio Holdings	687
Portfolio Turnover Rate	226%
Total Advisory Fees Paid	$5,096,324

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.24%
Corporate Bonds	39.57%
Floating Rate Loans	1.38%
Foreign Government Obligations	0.64%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.90%
Government Sponsored Enterprises Pass-Throughs	21.68%
Municipal Bonds	0.03%
Non-Agency Commercial Mortgage-Backed Securities	7.18%
U.S. Treasury Obligations	15.92%
Repurchase Agreements	0.95%
Money Market Funds^{Footnote Reference(a)}	0.46%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000162901

Shareholder Report [Line Items]

Fund Name

Lord Abbett Core Plus Bond Fund

Class Name

Class I

Trading Symbol

LAPIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Core Plus Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$22	0.43%

Expenses Paid, Amount

$ 22

Expense Ratio, Percent

0.43%

AssetsNet

$ 3,865,232,447

Holdings Count | Holding

687

Advisory Fees Paid, Amount

$ 5,096,324

InvestmentCompanyPortfolioTurnover

226.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,865,232,447
# of Portfolio Holdings	687
Portfolio Turnover Rate	226%
Total Advisory Fees Paid	$5,096,324

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.24%
Corporate Bonds	39.57%
Floating Rate Loans	1.38%
Foreign Government Obligations	0.64%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.90%
Government Sponsored Enterprises Pass-Throughs	21.68%
Municipal Bonds	0.03%
Non-Agency Commercial Mortgage-Backed Securities	7.18%
U.S. Treasury Obligations	15.92%
Repurchase Agreements	0.95%
Money Market Funds^{Footnote Reference(a)}	0.46%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000162903

Shareholder Report [Line Items]

Fund Name

Lord Abbett Core Plus Bond Fund

Class Name

Class R3

Trading Symbol

LAPQX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Core Plus Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R3	$46	0.93%

Expenses Paid, Amount

$ 46

Expense Ratio, Percent

0.93%

AssetsNet

$ 3,865,232,447

Holdings Count | Holding

687

Advisory Fees Paid, Amount

$ 5,096,324

InvestmentCompanyPortfolioTurnover

226.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,865,232,447
# of Portfolio Holdings	687
Portfolio Turnover Rate	226%
Total Advisory Fees Paid	$5,096,324

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.24%
Corporate Bonds	39.57%
Floating Rate Loans	1.38%
Foreign Government Obligations	0.64%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.90%
Government Sponsored Enterprises Pass-Throughs	21.68%
Municipal Bonds	0.03%
Non-Agency Commercial Mortgage-Backed Securities	7.18%
U.S. Treasury Obligations	15.92%
Repurchase Agreements	0.95%
Money Market Funds^{Footnote Reference(a)}	0.46%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000162904

Shareholder Report [Line Items]

Fund Name

Lord Abbett Core Plus Bond Fund

Class Name

Class R4

Trading Symbol

LAPUX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Core Plus Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R4	$34	0.68%

Expenses Paid, Amount

$ 34

Expense Ratio, Percent

0.68%

AssetsNet

$ 3,865,232,447

Holdings Count | Holding

687

Advisory Fees Paid, Amount

$ 5,096,324

InvestmentCompanyPortfolioTurnover

226.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,865,232,447
# of Portfolio Holdings	687
Portfolio Turnover Rate	226%
Total Advisory Fees Paid	$5,096,324

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.24%
Corporate Bonds	39.57%
Floating Rate Loans	1.38%
Foreign Government Obligations	0.64%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.90%
Government Sponsored Enterprises Pass-Throughs	21.68%
Municipal Bonds	0.03%
Non-Agency Commercial Mortgage-Backed Securities	7.18%
U.S. Treasury Obligations	15.92%
Repurchase Agreements	0.95%
Money Market Funds^{Footnote Reference(a)}	0.46%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000162905

Shareholder Report [Line Items]

Fund Name

Lord Abbett Core Plus Bond Fund

Class Name

Class R5

Trading Symbol

LAPVX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Core Plus Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R5	$21	0.42%

Expenses Paid, Amount

$ 21

Expense Ratio, Percent

0.42%

AssetsNet

$ 3,865,232,447

Holdings Count | Holding

687

Advisory Fees Paid, Amount

$ 5,096,324

InvestmentCompanyPortfolioTurnover

226.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,865,232,447
# of Portfolio Holdings	687
Portfolio Turnover Rate	226%
Total Advisory Fees Paid	$5,096,324

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.24%
Corporate Bonds	39.57%
Floating Rate Loans	1.38%
Foreign Government Obligations	0.64%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.90%
Government Sponsored Enterprises Pass-Throughs	21.68%
Municipal Bonds	0.03%
Non-Agency Commercial Mortgage-Backed Securities	7.18%
U.S. Treasury Obligations	15.92%
Repurchase Agreements	0.95%
Money Market Funds^{Footnote Reference(a)}	0.46%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000162906

Shareholder Report [Line Items]

Fund Name

Lord Abbett Core Plus Bond Fund

Class Name

Class R6

Trading Symbol

LAPWX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Core Plus Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$18	0.35%

Expenses Paid, Amount

$ 18

Expense Ratio, Percent

0.35%

AssetsNet

$ 3,865,232,447

Holdings Count | Holding

687

Advisory Fees Paid, Amount

$ 5,096,324

InvestmentCompanyPortfolioTurnover

226.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,865,232,447
# of Portfolio Holdings	687
Portfolio Turnover Rate	226%
Total Advisory Fees Paid	$5,096,324

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	11.24%
Corporate Bonds	39.57%
Floating Rate Loans	1.38%
Foreign Government Obligations	0.64%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.90%
Government Sponsored Enterprises Pass-Throughs	21.68%
Municipal Bonds	0.03%
Non-Agency Commercial Mortgage-Backed Securities	7.18%
U.S. Treasury Obligations	15.92%
Repurchase Agreements	0.95%
Money Market Funds^{Footnote Reference(a)}	0.46%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000055470

Shareholder Report [Line Items]

Fund Name

Lord Abbett Floating Rate Fund

Class Name

Class A

Trading Symbol

LFRAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Floating Rate Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$40	0.80%

Expenses Paid, Amount

$ 40

Expense Ratio, Percent

0.80%

AssetsNet

$ 4,669,824,443

Holdings Count | Holding

460

Advisory Fees Paid, Amount

$ 11,082,820

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,669,824,443
# of Portfolio Holdings	460
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$11,082,820

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	2.16%
Common Stocks	0.48%
Corporate Bonds	6.85%
Exchange-Traded Funds	2.23%
Floating Rate Loans	82.30%
Preferred Stocks	0.61%
Warrants	0.00%^{Footnote Reference**}
Repurchase Agreements	3.90%
Money Market Funds^{Footnote Reference(a)}	1.32%
Time Deposits^{Footnote Reference(a)}	0.15%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000055472

Shareholder Report [Line Items]

Fund Name

Lord Abbett Floating Rate Fund

Class Name

Class C

Trading Symbol

LARCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Floating Rate Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$72	1.43%

Expenses Paid, Amount

$ 72

Expense Ratio, Percent

1.43%

AssetsNet

$ 4,669,824,443

Holdings Count | Holding

460

Advisory Fees Paid, Amount

$ 11,082,820

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,669,824,443
# of Portfolio Holdings	460
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$11,082,820

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	2.16%
Common Stocks	0.48%
Corporate Bonds	6.85%
Exchange-Traded Funds	2.23%
Floating Rate Loans	82.30%
Preferred Stocks	0.61%
Warrants	0.00%^{Footnote Reference**}
Repurchase Agreements	3.90%
Money Market Funds^{Footnote Reference(a)}	1.32%
Time Deposits^{Footnote Reference(a)}	0.15%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000055473

Shareholder Report [Line Items]

Fund Name

Lord Abbett Floating Rate Fund

Class Name

Class F

Trading Symbol

LFRFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Floating Rate Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F	$35	0.70%

Expenses Paid, Amount

$ 35

Expense Ratio, Percent

0.70%

AssetsNet

$ 4,669,824,443

Holdings Count | Holding

460

Advisory Fees Paid, Amount

$ 11,082,820

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,669,824,443
# of Portfolio Holdings	460
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$11,082,820

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	2.16%
Common Stocks	0.48%
Corporate Bonds	6.85%
Exchange-Traded Funds	2.23%
Floating Rate Loans	82.30%
Preferred Stocks	0.61%
Warrants	0.00%^{Footnote Reference**}
Repurchase Agreements	3.90%
Money Market Funds^{Footnote Reference(a)}	1.32%
Time Deposits^{Footnote Reference(a)}	0.15%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000188252

Shareholder Report [Line Items]

Fund Name

Lord Abbett Floating Rate Fund

Class Name

Class F3

Trading Symbol

LFROX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Floating Rate Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F3	$27	0.53%

Expenses Paid, Amount

$ 27

Expense Ratio, Percent

0.53%

AssetsNet

$ 4,669,824,443

Holdings Count | Holding

460

Advisory Fees Paid, Amount

$ 11,082,820

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,669,824,443
# of Portfolio Holdings	460
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$11,082,820

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	2.16%
Common Stocks	0.48%
Corporate Bonds	6.85%
Exchange-Traded Funds	2.23%
Floating Rate Loans	82.30%
Preferred Stocks	0.61%
Warrants	0.00%^{Footnote Reference**}
Repurchase Agreements	3.90%
Money Market Funds^{Footnote Reference(a)}	1.32%
Time Deposits^{Footnote Reference(a)}	0.15%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000055474

Shareholder Report [Line Items]

Fund Name

Lord Abbett Floating Rate Fund

Class Name

Class I

Trading Symbol

LFRIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Floating Rate Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$30	0.60%

Expenses Paid, Amount

$ 30

Expense Ratio, Percent

0.60%

AssetsNet

$ 4,669,824,443

Holdings Count | Holding

460

Advisory Fees Paid, Amount

$ 11,082,820

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,669,824,443
# of Portfolio Holdings	460
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$11,082,820

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	2.16%
Common Stocks	0.48%
Corporate Bonds	6.85%
Exchange-Traded Funds	2.23%
Floating Rate Loans	82.30%
Preferred Stocks	0.61%
Warrants	0.00%^{Footnote Reference**}
Repurchase Agreements	3.90%
Money Market Funds^{Footnote Reference(a)}	1.32%
Time Deposits^{Footnote Reference(a)}	0.15%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000055475

Shareholder Report [Line Items]

Fund Name

Lord Abbett Floating Rate Fund

Class Name

Class R2

Trading Symbol

LFRRX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Floating Rate Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R2	$61	1.21%

Expenses Paid, Amount

$ 61

Expense Ratio, Percent

1.21%

AssetsNet

$ 4,669,824,443

Holdings Count | Holding

460

Advisory Fees Paid, Amount

$ 11,082,820

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,669,824,443
# of Portfolio Holdings	460
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$11,082,820

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	2.16%
Common Stocks	0.48%
Corporate Bonds	6.85%
Exchange-Traded Funds	2.23%
Floating Rate Loans	82.30%
Preferred Stocks	0.61%
Warrants	0.00%^{Footnote Reference**}
Repurchase Agreements	3.90%
Money Market Funds^{Footnote Reference(a)}	1.32%
Time Deposits^{Footnote Reference(a)}	0.15%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000055476

Shareholder Report [Line Items]

Fund Name

Lord Abbett Floating Rate Fund

Class Name

Class R3

Trading Symbol

LRRRX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Floating Rate Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R3	$55	1.10%

Expenses Paid, Amount

$ 55

Expense Ratio, Percent

1.10%

AssetsNet

$ 4,669,824,443

Holdings Count | Holding

460

Advisory Fees Paid, Amount

$ 11,082,820

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,669,824,443
# of Portfolio Holdings	460
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$11,082,820

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	2.16%
Common Stocks	0.48%
Corporate Bonds	6.85%
Exchange-Traded Funds	2.23%
Floating Rate Loans	82.30%
Preferred Stocks	0.61%
Warrants	0.00%^{Footnote Reference**}
Repurchase Agreements	3.90%
Money Market Funds^{Footnote Reference(a)}	1.32%
Time Deposits^{Footnote Reference(a)}	0.15%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156647

Shareholder Report [Line Items]

Fund Name

Lord Abbett Floating Rate Fund

Class Name

Class R4

Trading Symbol

LRRKX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Floating Rate Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R4	$43	0.85%

Expenses Paid, Amount

$ 43

Expense Ratio, Percent

0.85%

AssetsNet

$ 4,669,824,443

Holdings Count | Holding

460

Advisory Fees Paid, Amount

$ 11,082,820

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,669,824,443
# of Portfolio Holdings	460
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$11,082,820

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	2.16%
Common Stocks	0.48%
Corporate Bonds	6.85%
Exchange-Traded Funds	2.23%
Floating Rate Loans	82.30%
Preferred Stocks	0.61%
Warrants	0.00%^{Footnote Reference**}
Repurchase Agreements	3.90%
Money Market Funds^{Footnote Reference(a)}	1.32%
Time Deposits^{Footnote Reference(a)}	0.15%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156648

Shareholder Report [Line Items]

Fund Name

Lord Abbett Floating Rate Fund

Class Name

Class R5

Trading Symbol

LRRTX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Floating Rate Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R5	$30	0.60%

Expenses Paid, Amount

$ 30

Expense Ratio, Percent

0.60%

AssetsNet

$ 4,669,824,443

Holdings Count | Holding

460

Advisory Fees Paid, Amount

$ 11,082,820

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,669,824,443
# of Portfolio Holdings	460
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$11,082,820

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	2.16%
Common Stocks	0.48%
Corporate Bonds	6.85%
Exchange-Traded Funds	2.23%
Floating Rate Loans	82.30%
Preferred Stocks	0.61%
Warrants	0.00%^{Footnote Reference**}
Repurchase Agreements	3.90%
Money Market Funds^{Footnote Reference(a)}	1.32%
Time Deposits^{Footnote Reference(a)}	0.15%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156649

Shareholder Report [Line Items]

Fund Name

Lord Abbett Floating Rate Fund

Class Name

Class R6

Trading Symbol

LRRVX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Floating Rate Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$27	0.53%

Expenses Paid, Amount

$ 27

Expense Ratio, Percent

0.53%

AssetsNet

$ 4,669,824,443

Holdings Count | Holding

460

Advisory Fees Paid, Amount

$ 11,082,820

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$4,669,824,443
# of Portfolio Holdings	460
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$11,082,820

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	2.16%
Common Stocks	0.48%
Corporate Bonds	6.85%
Exchange-Traded Funds	2.23%
Floating Rate Loans	82.30%
Preferred Stocks	0.61%
Warrants	0.00%^{Footnote Reference**}
Repurchase Agreements	3.90%
Money Market Funds^{Footnote Reference(a)}	1.32%
Time Deposits^{Footnote Reference(a)}	0.15%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000019985

Shareholder Report [Line Items]

Fund Name

Lord Abbett High Yield Fund

Class Name

Class A

Trading Symbol

LHYAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett High Yield Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$47	0.93%

Expenses Paid, Amount

$ 47

Expense Ratio, Percent

0.93%

AssetsNet

$ 3,431,415,961

Holdings Count | Holding

664

Advisory Fees Paid, Amount

$ 9,484,079

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,431,415,961
# of Portfolio Holdings	664
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$9,484,079

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Common Stocks	0.26%
Convertible Bonds	0.02%
Corporate Bonds	93.01%
Floating Rate Loans	3.43%
Non-Agency Commercial Mortgage-Backed Securities	0.32%
Preferred Stocks	0.19%
Warrants	0.00%^{Footnote Reference**}
Money Market Funds^{Footnote Reference(a)}	2.49%
Time Deposits^{Footnote Reference(a)}	0.28%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000019987

Shareholder Report [Line Items]

Fund Name

Lord Abbett High Yield Fund

Class Name

Class C

Trading Symbol

LHYCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett High Yield Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$77	1.55%

Expenses Paid, Amount

$ 77

Expense Ratio, Percent

1.55%

AssetsNet

$ 3,431,415,961

Holdings Count | Holding

664

Advisory Fees Paid, Amount

$ 9,484,079

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,431,415,961
# of Portfolio Holdings	664
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$9,484,079

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Common Stocks	0.26%
Convertible Bonds	0.02%
Corporate Bonds	93.01%
Floating Rate Loans	3.43%
Non-Agency Commercial Mortgage-Backed Securities	0.32%
Preferred Stocks	0.19%
Warrants	0.00%^{Footnote Reference**}
Money Market Funds^{Footnote Reference(a)}	2.49%
Time Deposits^{Footnote Reference(a)}	0.28%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054888

Shareholder Report [Line Items]

Fund Name

Lord Abbett High Yield Fund

Class Name

Class F

Trading Symbol

LHYFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett High Yield Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F	$42	0.83%

Expenses Paid, Amount

$ 42

Expense Ratio, Percent

0.83%

AssetsNet

$ 3,431,415,961

Holdings Count | Holding

664

Advisory Fees Paid, Amount

$ 9,484,079

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,431,415,961
# of Portfolio Holdings	664
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$9,484,079

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Common Stocks	0.26%
Convertible Bonds	0.02%
Corporate Bonds	93.01%
Floating Rate Loans	3.43%
Non-Agency Commercial Mortgage-Backed Securities	0.32%
Preferred Stocks	0.19%
Warrants	0.00%^{Footnote Reference**}
Money Market Funds^{Footnote Reference(a)}	2.49%
Time Deposits^{Footnote Reference(a)}	0.28%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000188236

Shareholder Report [Line Items]

Fund Name

Lord Abbett High Yield Fund

Class Name

Class F3

Trading Symbol

LHYOX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett High Yield Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F3	$31	0.62%

Expenses Paid, Amount

$ 31

Expense Ratio, Percent

0.62%

AssetsNet

$ 3,431,415,961

Holdings Count | Holding

664

Advisory Fees Paid, Amount

$ 9,484,079

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,431,415,961
# of Portfolio Holdings	664
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$9,484,079

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Common Stocks	0.26%
Convertible Bonds	0.02%
Corporate Bonds	93.01%
Floating Rate Loans	3.43%
Non-Agency Commercial Mortgage-Backed Securities	0.32%
Preferred Stocks	0.19%
Warrants	0.00%^{Footnote Reference**}
Money Market Funds^{Footnote Reference(a)}	2.49%
Time Deposits^{Footnote Reference(a)}	0.28%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000019989

Shareholder Report [Line Items]

Fund Name

Lord Abbett High Yield Fund

Class Name

Class I

Trading Symbol

LAHYX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett High Yield Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$37	0.73%

Expenses Paid, Amount

$ 37

Expense Ratio, Percent

0.73%

AssetsNet

$ 3,431,415,961

Holdings Count | Holding

664

Advisory Fees Paid, Amount

$ 9,484,079

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,431,415,961
# of Portfolio Holdings	664
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$9,484,079

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Common Stocks	0.26%
Convertible Bonds	0.02%
Corporate Bonds	93.01%
Floating Rate Loans	3.43%
Non-Agency Commercial Mortgage-Backed Securities	0.32%
Preferred Stocks	0.19%
Warrants	0.00%^{Footnote Reference**}
Money Market Funds^{Footnote Reference(a)}	2.49%
Time Deposits^{Footnote Reference(a)}	0.28%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054889

Shareholder Report [Line Items]

Fund Name

Lord Abbett High Yield Fund

Class Name

Class R2

Trading Symbol

LHYQX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett High Yield Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R2	$66	1.33%

Expenses Paid, Amount

$ 66

Expense Ratio, Percent

1.33%

AssetsNet

$ 3,431,415,961

Holdings Count | Holding

664

Advisory Fees Paid, Amount

$ 9,484,079

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,431,415,961
# of Portfolio Holdings	664
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$9,484,079

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Common Stocks	0.26%
Convertible Bonds	0.02%
Corporate Bonds	93.01%
Floating Rate Loans	3.43%
Non-Agency Commercial Mortgage-Backed Securities	0.32%
Preferred Stocks	0.19%
Warrants	0.00%^{Footnote Reference**}
Money Market Funds^{Footnote Reference(a)}	2.49%
Time Deposits^{Footnote Reference(a)}	0.28%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054890

Shareholder Report [Line Items]

Fund Name

Lord Abbett High Yield Fund

Class Name

Class R3

Trading Symbol

LHYRX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett High Yield Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R3	$62	1.23%

Expenses Paid, Amount

$ 62

Expense Ratio, Percent

1.23%

AssetsNet

$ 3,431,415,961

Holdings Count | Holding

664

Advisory Fees Paid, Amount

$ 9,484,079

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,431,415,961
# of Portfolio Holdings	664
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$9,484,079

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Common Stocks	0.26%
Convertible Bonds	0.02%
Corporate Bonds	93.01%
Floating Rate Loans	3.43%
Non-Agency Commercial Mortgage-Backed Securities	0.32%
Preferred Stocks	0.19%
Warrants	0.00%^{Footnote Reference**}
Money Market Funds^{Footnote Reference(a)}	2.49%
Time Deposits^{Footnote Reference(a)}	0.28%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156623

Shareholder Report [Line Items]

Fund Name

Lord Abbett High Yield Fund

Class Name

Class R4

Trading Symbol

LHYSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett High Yield Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R4	$49	0.98%

Expenses Paid, Amount

$ 49

Expense Ratio, Percent

0.98%

AssetsNet

$ 3,431,415,961

Holdings Count | Holding

664

Advisory Fees Paid, Amount

$ 9,484,079

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,431,415,961
# of Portfolio Holdings	664
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$9,484,079

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Common Stocks	0.26%
Convertible Bonds	0.02%
Corporate Bonds	93.01%
Floating Rate Loans	3.43%
Non-Agency Commercial Mortgage-Backed Securities	0.32%
Preferred Stocks	0.19%
Warrants	0.00%^{Footnote Reference**}
Money Market Funds^{Footnote Reference(a)}	2.49%
Time Deposits^{Footnote Reference(a)}	0.28%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156624

Shareholder Report [Line Items]

Fund Name

Lord Abbett High Yield Fund

Class Name

Class R5

Trading Symbol

LHYTX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett High Yield Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R5	$37	0.73%

Expenses Paid, Amount

$ 37

Expense Ratio, Percent

0.73%

AssetsNet

$ 3,431,415,961

Holdings Count | Holding

664

Advisory Fees Paid, Amount

$ 9,484,079

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,431,415,961
# of Portfolio Holdings	664
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$9,484,079

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Common Stocks	0.26%
Convertible Bonds	0.02%
Corporate Bonds	93.01%
Floating Rate Loans	3.43%
Non-Agency Commercial Mortgage-Backed Securities	0.32%
Preferred Stocks	0.19%
Warrants	0.00%^{Footnote Reference**}
Money Market Funds^{Footnote Reference(a)}	2.49%
Time Deposits^{Footnote Reference(a)}	0.28%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156625

Shareholder Report [Line Items]

Fund Name

Lord Abbett High Yield Fund

Class Name

Class R6

Trading Symbol

LHYVX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett High Yield Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$31	0.62%

Expenses Paid, Amount

$ 31

Expense Ratio, Percent

0.62%

AssetsNet

$ 3,431,415,961

Holdings Count | Holding

664

Advisory Fees Paid, Amount

$ 9,484,079

InvestmentCompanyPortfolioTurnover

41.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,431,415,961
# of Portfolio Holdings	664
Portfolio Turnover Rate	41%
Total Advisory Fees Paid	$9,484,079

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Common Stocks	0.26%
Convertible Bonds	0.02%
Corporate Bonds	93.01%
Floating Rate Loans	3.43%
Non-Agency Commercial Mortgage-Backed Securities	0.32%
Preferred Stocks	0.19%
Warrants	0.00%^{Footnote Reference**}
Money Market Funds^{Footnote Reference(a)}	2.49%
Time Deposits^{Footnote Reference(a)}	0.28%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000020002

Shareholder Report [Line Items]

Fund Name

Lord Abbett Income Fund

Class Name

Class A

Trading Symbol

LAGVX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$35	0.70%

Expenses Paid, Amount

$ 35

Expense Ratio, Percent

0.70%

AssetsNet

$ 5,672,250,050

Holdings Count | Holding

530

Advisory Fees Paid, Amount

$ 10,267,202

InvestmentCompanyPortfolioTurnover

119.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$5,672,250,050
# of Portfolio Holdings	530
Portfolio Turnover Rate	119%
Total Advisory Fees Paid	$10,267,202

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	9.28%
Corporate Bonds	70.76%
Floating Rate Loans	8.65%
Foreign Government Obligations	1.12%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	7.03%
Non-Agency Commercial Mortgage-Backed Securities	0.26%
U.S. Treasury Obligations	1.04%
Repurchase Agreements	0.50%
Money Market Funds^{Footnote Reference(a)}	1.22%
Time Deposits^{Footnote Reference(a)}	0.14%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000020004

Shareholder Report [Line Items]

Fund Name

Lord Abbett Income Fund

Class Name

Class C

Trading Symbol

LAUSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$67	1.35%

Expenses Paid, Amount

$ 67

Expense Ratio, Percent

1.35%

AssetsNet

$ 5,672,250,050

Holdings Count | Holding

530

Advisory Fees Paid, Amount

$ 10,267,202

InvestmentCompanyPortfolioTurnover

119.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$5,672,250,050
# of Portfolio Holdings	530
Portfolio Turnover Rate	119%
Total Advisory Fees Paid	$10,267,202

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	9.28%
Corporate Bonds	70.76%
Floating Rate Loans	8.65%
Foreign Government Obligations	1.12%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	7.03%
Non-Agency Commercial Mortgage-Backed Securities	0.26%
U.S. Treasury Obligations	1.04%
Repurchase Agreements	0.50%
Money Market Funds^{Footnote Reference(a)}	1.22%
Time Deposits^{Footnote Reference(a)}	0.14%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054897

Shareholder Report [Line Items]

Fund Name

Lord Abbett Income Fund

Class Name

Class F

Trading Symbol

LAUFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F	$30	0.60%

Expenses Paid, Amount

$ 30

Expense Ratio, Percent

0.60%

AssetsNet

$ 5,672,250,050

Holdings Count | Holding

530

Advisory Fees Paid, Amount

$ 10,267,202

InvestmentCompanyPortfolioTurnover

119.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$5,672,250,050
# of Portfolio Holdings	530
Portfolio Turnover Rate	119%
Total Advisory Fees Paid	$10,267,202

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	9.28%
Corporate Bonds	70.76%
Floating Rate Loans	8.65%
Foreign Government Obligations	1.12%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	7.03%
Non-Agency Commercial Mortgage-Backed Securities	0.26%
U.S. Treasury Obligations	1.04%
Repurchase Agreements	0.50%
Money Market Funds^{Footnote Reference(a)}	1.22%
Time Deposits^{Footnote Reference(a)}	0.14%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000188242

Shareholder Report [Line Items]

Fund Name

Lord Abbett Income Fund

Class Name

Class F3

Trading Symbol

LOGVX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F3	$21	0.43%

Expenses Paid, Amount

$ 21

Expense Ratio, Percent

0.43%

AssetsNet

$ 5,672,250,050

Holdings Count | Holding

530

Advisory Fees Paid, Amount

$ 10,267,202

InvestmentCompanyPortfolioTurnover

119.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$5,672,250,050
# of Portfolio Holdings	530
Portfolio Turnover Rate	119%
Total Advisory Fees Paid	$10,267,202

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	9.28%
Corporate Bonds	70.76%
Floating Rate Loans	8.65%
Foreign Government Obligations	1.12%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	7.03%
Non-Agency Commercial Mortgage-Backed Securities	0.26%
U.S. Treasury Obligations	1.04%
Repurchase Agreements	0.50%
Money Market Funds^{Footnote Reference(a)}	1.22%
Time Deposits^{Footnote Reference(a)}	0.14%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000020001

Shareholder Report [Line Items]

Fund Name

Lord Abbett Income Fund

Class Name

Class I

Trading Symbol

LAUYX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$25	0.50%

Expenses Paid, Amount

$ 25

Expense Ratio, Percent

0.50%

AssetsNet

$ 5,672,250,050

Holdings Count | Holding

530

Advisory Fees Paid, Amount

$ 10,267,202

InvestmentCompanyPortfolioTurnover

119.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$5,672,250,050
# of Portfolio Holdings	530
Portfolio Turnover Rate	119%
Total Advisory Fees Paid	$10,267,202

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	9.28%
Corporate Bonds	70.76%
Floating Rate Loans	8.65%
Foreign Government Obligations	1.12%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	7.03%
Non-Agency Commercial Mortgage-Backed Securities	0.26%
U.S. Treasury Obligations	1.04%
Repurchase Agreements	0.50%
Money Market Funds^{Footnote Reference(a)}	1.22%
Time Deposits^{Footnote Reference(a)}	0.14%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054898

Shareholder Report [Line Items]

Fund Name

Lord Abbett Income Fund

Class Name

Class R2

Trading Symbol

LAUQX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R2	$55	1.10%

Expenses Paid, Amount

$ 55

Expense Ratio, Percent

1.10%

AssetsNet

$ 5,672,250,050

Holdings Count | Holding

530

Advisory Fees Paid, Amount

$ 10,267,202

InvestmentCompanyPortfolioTurnover

119.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$5,672,250,050
# of Portfolio Holdings	530
Portfolio Turnover Rate	119%
Total Advisory Fees Paid	$10,267,202

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	9.28%
Corporate Bonds	70.76%
Floating Rate Loans	8.65%
Foreign Government Obligations	1.12%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	7.03%
Non-Agency Commercial Mortgage-Backed Securities	0.26%
U.S. Treasury Obligations	1.04%
Repurchase Agreements	0.50%
Money Market Funds^{Footnote Reference(a)}	1.22%
Time Deposits^{Footnote Reference(a)}	0.14%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054899

Shareholder Report [Line Items]

Fund Name

Lord Abbett Income Fund

Class Name

Class R3

Trading Symbol

LAURX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R3	$50	1.00%

Expenses Paid, Amount

$ 50

Expense Ratio, Percent

1.00%

AssetsNet

$ 5,672,250,050

Holdings Count | Holding

530

Advisory Fees Paid, Amount

$ 10,267,202

InvestmentCompanyPortfolioTurnover

119.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$5,672,250,050
# of Portfolio Holdings	530
Portfolio Turnover Rate	119%
Total Advisory Fees Paid	$10,267,202

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	9.28%
Corporate Bonds	70.76%
Floating Rate Loans	8.65%
Foreign Government Obligations	1.12%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	7.03%
Non-Agency Commercial Mortgage-Backed Securities	0.26%
U.S. Treasury Obligations	1.04%
Repurchase Agreements	0.50%
Money Market Funds^{Footnote Reference(a)}	1.22%
Time Deposits^{Footnote Reference(a)}	0.14%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156632

Shareholder Report [Line Items]

Fund Name

Lord Abbett Income Fund

Class Name

Class R4

Trading Symbol

LAUKX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R4	$37	0.75%

Expenses Paid, Amount

$ 37

Expense Ratio, Percent

0.75%

AssetsNet

$ 5,672,250,050

Holdings Count | Holding

530

Advisory Fees Paid, Amount

$ 10,267,202

InvestmentCompanyPortfolioTurnover

119.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$5,672,250,050
# of Portfolio Holdings	530
Portfolio Turnover Rate	119%
Total Advisory Fees Paid	$10,267,202

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	9.28%
Corporate Bonds	70.76%
Floating Rate Loans	8.65%
Foreign Government Obligations	1.12%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	7.03%
Non-Agency Commercial Mortgage-Backed Securities	0.26%
U.S. Treasury Obligations	1.04%
Repurchase Agreements	0.50%
Money Market Funds^{Footnote Reference(a)}	1.22%
Time Deposits^{Footnote Reference(a)}	0.14%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156633

Shareholder Report [Line Items]

Fund Name

Lord Abbett Income Fund

Class Name

Class R5

Trading Symbol

LAUTX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R5	$25	0.50%

Expenses Paid, Amount

$ 25

Expense Ratio, Percent

0.50%

AssetsNet

$ 5,672,250,050

Holdings Count | Holding

530

Advisory Fees Paid, Amount

$ 10,267,202

InvestmentCompanyPortfolioTurnover

119.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$5,672,250,050
# of Portfolio Holdings	530
Portfolio Turnover Rate	119%
Total Advisory Fees Paid	$10,267,202

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	9.28%
Corporate Bonds	70.76%
Floating Rate Loans	8.65%
Foreign Government Obligations	1.12%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	7.03%
Non-Agency Commercial Mortgage-Backed Securities	0.26%
U.S. Treasury Obligations	1.04%
Repurchase Agreements	0.50%
Money Market Funds^{Footnote Reference(a)}	1.22%
Time Deposits^{Footnote Reference(a)}	0.14%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156634

Shareholder Report [Line Items]

Fund Name

Lord Abbett Income Fund

Class Name

Class R6

Trading Symbol

LAUVX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$21	0.43%

Expenses Paid, Amount

$ 21

Expense Ratio, Percent

0.43%

AssetsNet

$ 5,672,250,050

Holdings Count | Holding

530

Advisory Fees Paid, Amount

$ 10,267,202

InvestmentCompanyPortfolioTurnover

119.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$5,672,250,050
# of Portfolio Holdings	530
Portfolio Turnover Rate	119%
Total Advisory Fees Paid	$10,267,202

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	9.28%
Corporate Bonds	70.76%
Floating Rate Loans	8.65%
Foreign Government Obligations	1.12%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	7.03%
Non-Agency Commercial Mortgage-Backed Securities	0.26%
U.S. Treasury Obligations	1.04%
Repurchase Agreements	0.50%
Money Market Funds^{Footnote Reference(a)}	1.22%
Time Deposits^{Footnote Reference(a)}	0.14%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000099493

Shareholder Report [Line Items]

Fund Name

Lord Abbett Inflation Focused Fund

Class Name

Class A

Trading Symbol

LIFAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Inflation Focused Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$38	0.74%

Expenses Paid, Amount

$ 38

Expense Ratio, Percent

0.74%

AssetsNet

$ 760,320,718

Holdings Count | Holding

697

Advisory Fees Paid, Amount

$ 1,088,254

InvestmentCompanyPortfolioTurnover

83.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$760,320,718
# of Portfolio Holdings	697
Portfolio Turnover Rate	83%
Total Advisory Fees Paid	$1,088,254

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	20.02%
Convertible Bonds	0.09%
Corporate Bonds	59.85%
Floating Rate Loans	3.25%
Foreign Government Obligations	1.27%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.66%
Non-Agency Commercial Mortgage-Backed Securities	6.76%
U.S. Treasury Obligations	3.76%
Repurchase Agreements	0.32%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000099494

Shareholder Report [Line Items]

Fund Name

Lord Abbett Inflation Focused Fund

Class Name

Class C

Trading Symbol

LIFCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Inflation Focused Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$68	1.35%

Expenses Paid, Amount

$ 68

Expense Ratio, Percent

1.35%

AssetsNet

$ 760,320,718

Holdings Count | Holding

697

Advisory Fees Paid, Amount

$ 1,088,254

InvestmentCompanyPortfolioTurnover

83.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$760,320,718
# of Portfolio Holdings	697
Portfolio Turnover Rate	83%
Total Advisory Fees Paid	$1,088,254

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	20.02%
Convertible Bonds	0.09%
Corporate Bonds	59.85%
Floating Rate Loans	3.25%
Foreign Government Obligations	1.27%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.66%
Non-Agency Commercial Mortgage-Backed Securities	6.76%
U.S. Treasury Obligations	3.76%
Repurchase Agreements	0.32%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000099495

Shareholder Report [Line Items]

Fund Name

Lord Abbett Inflation Focused Fund

Class Name

Class F

Trading Symbol

LIFFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Inflation Focused Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F	$33	0.65%

Expenses Paid, Amount

$ 33

Expense Ratio, Percent

0.65%

AssetsNet

$ 760,320,718

Holdings Count | Holding

697

Advisory Fees Paid, Amount

$ 1,088,254

InvestmentCompanyPortfolioTurnover

83.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$760,320,718
# of Portfolio Holdings	697
Portfolio Turnover Rate	83%
Total Advisory Fees Paid	$1,088,254

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	20.02%
Convertible Bonds	0.09%
Corporate Bonds	59.85%
Floating Rate Loans	3.25%
Foreign Government Obligations	1.27%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.66%
Non-Agency Commercial Mortgage-Backed Securities	6.76%
U.S. Treasury Obligations	3.76%
Repurchase Agreements	0.32%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000188254

Shareholder Report [Line Items]

Fund Name

Lord Abbett Inflation Focused Fund

Class Name

Class F3

Trading Symbol

LIFOX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Inflation Focused Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F3	$22	0.44%

Expenses Paid, Amount

$ 22

Expense Ratio, Percent

0.44%

AssetsNet

$ 760,320,718

Holdings Count | Holding

697

Advisory Fees Paid, Amount

$ 1,088,254

InvestmentCompanyPortfolioTurnover

83.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$760,320,718
# of Portfolio Holdings	697
Portfolio Turnover Rate	83%
Total Advisory Fees Paid	$1,088,254

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	20.02%
Convertible Bonds	0.09%
Corporate Bonds	59.85%
Floating Rate Loans	3.25%
Foreign Government Obligations	1.27%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.66%
Non-Agency Commercial Mortgage-Backed Securities	6.76%
U.S. Treasury Obligations	3.76%
Repurchase Agreements	0.32%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000099496

Shareholder Report [Line Items]

Fund Name

Lord Abbett Inflation Focused Fund

Class Name

Class I

Trading Symbol

LIFIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Inflation Focused Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$27	0.54%

Expenses Paid, Amount

$ 27

Expense Ratio, Percent

0.54%

AssetsNet

$ 760,320,718

Holdings Count | Holding

697

Advisory Fees Paid, Amount

$ 1,088,254

InvestmentCompanyPortfolioTurnover

83.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$760,320,718
# of Portfolio Holdings	697
Portfolio Turnover Rate	83%
Total Advisory Fees Paid	$1,088,254

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	20.02%
Convertible Bonds	0.09%
Corporate Bonds	59.85%
Floating Rate Loans	3.25%
Foreign Government Obligations	1.27%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.66%
Non-Agency Commercial Mortgage-Backed Securities	6.76%
U.S. Treasury Obligations	3.76%
Repurchase Agreements	0.32%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000099497

Shareholder Report [Line Items]

Fund Name

Lord Abbett Inflation Focused Fund

Class Name

Class R2

Trading Symbol

LIFQX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Inflation Focused Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R2	$58	1.14%

Expenses Paid, Amount

$ 58

Expense Ratio, Percent

1.14%

AssetsNet

$ 760,320,718

Holdings Count | Holding

697

Advisory Fees Paid, Amount

$ 1,088,254

InvestmentCompanyPortfolioTurnover

83.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$760,320,718
# of Portfolio Holdings	697
Portfolio Turnover Rate	83%
Total Advisory Fees Paid	$1,088,254

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	20.02%
Convertible Bonds	0.09%
Corporate Bonds	59.85%
Floating Rate Loans	3.25%
Foreign Government Obligations	1.27%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.66%
Non-Agency Commercial Mortgage-Backed Securities	6.76%
U.S. Treasury Obligations	3.76%
Repurchase Agreements	0.32%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000099498

Shareholder Report [Line Items]

Fund Name

Lord Abbett Inflation Focused Fund

Class Name

Class R3

Trading Symbol

LIFRX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Inflation Focused Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R3	$53	1.04%

Expenses Paid, Amount

$ 53

Expense Ratio, Percent

1.04%

AssetsNet

$ 760,320,718

Holdings Count | Holding

697

Advisory Fees Paid, Amount

$ 1,088,254

InvestmentCompanyPortfolioTurnover

83.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$760,320,718
# of Portfolio Holdings	697
Portfolio Turnover Rate	83%
Total Advisory Fees Paid	$1,088,254

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	20.02%
Convertible Bonds	0.09%
Corporate Bonds	59.85%
Floating Rate Loans	3.25%
Foreign Government Obligations	1.27%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.66%
Non-Agency Commercial Mortgage-Backed Securities	6.76%
U.S. Treasury Obligations	3.76%
Repurchase Agreements	0.32%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156650

Shareholder Report [Line Items]

Fund Name

Lord Abbett Inflation Focused Fund

Class Name

Class R4

Trading Symbol

LIFKX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Inflation Focused Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R4	$40	0.79%

Expenses Paid, Amount

$ 40

Expense Ratio, Percent

0.79%

AssetsNet

$ 760,320,718

Holdings Count | Holding

697

Advisory Fees Paid, Amount

$ 1,088,254

InvestmentCompanyPortfolioTurnover

83.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$760,320,718
# of Portfolio Holdings	697
Portfolio Turnover Rate	83%
Total Advisory Fees Paid	$1,088,254

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	20.02%
Convertible Bonds	0.09%
Corporate Bonds	59.85%
Floating Rate Loans	3.25%
Foreign Government Obligations	1.27%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.66%
Non-Agency Commercial Mortgage-Backed Securities	6.76%
U.S. Treasury Obligations	3.76%
Repurchase Agreements	0.32%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156651

Shareholder Report [Line Items]

Fund Name

Lord Abbett Inflation Focused Fund

Class Name

Class R5

Trading Symbol

LIFTX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Inflation Focused Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R5	$27	0.54%

Expenses Paid, Amount

$ 27

Expense Ratio, Percent

0.54%

AssetsNet

$ 760,320,718

Holdings Count | Holding

697

Advisory Fees Paid, Amount

$ 1,088,254

InvestmentCompanyPortfolioTurnover

83.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$760,320,718
# of Portfolio Holdings	697
Portfolio Turnover Rate	83%
Total Advisory Fees Paid	$1,088,254

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	20.02%
Convertible Bonds	0.09%
Corporate Bonds	59.85%
Floating Rate Loans	3.25%
Foreign Government Obligations	1.27%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.66%
Non-Agency Commercial Mortgage-Backed Securities	6.76%
U.S. Treasury Obligations	3.76%
Repurchase Agreements	0.32%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156652

Shareholder Report [Line Items]

Fund Name

Lord Abbett Inflation Focused Fund

Class Name

Class R6

Trading Symbol

LIFVX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Inflation Focused Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$22	0.44%

Expenses Paid, Amount

$ 22

Expense Ratio, Percent

0.44%

AssetsNet

$ 760,320,718

Holdings Count | Holding

697

Advisory Fees Paid, Amount

$ 1,088,254

InvestmentCompanyPortfolioTurnover

83.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$760,320,718
# of Portfolio Holdings	697
Portfolio Turnover Rate	83%
Total Advisory Fees Paid	$1,088,254

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	20.02%
Convertible Bonds	0.09%
Corporate Bonds	59.85%
Floating Rate Loans	3.25%
Foreign Government Obligations	1.27%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.66%
Non-Agency Commercial Mortgage-Backed Securities	6.76%
U.S. Treasury Obligations	3.76%
Repurchase Agreements	0.32%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000020006

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Balanced Opportunity Fund

Class Name

Class A

Trading Symbol

LABFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Balanced Opportunity Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$24	0.49%

Expenses Paid, Amount

$ 24

Expense Ratio, Percent

0.49%

AssetsNet

$ 1,923,224,408

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 966,762

InvestmentCompanyPortfolioTurnover

8.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$1,923,224,408
# of Portfolio Holdings	15
Portfolio Turnover Rate	8%
Total Advisory Fees Paid	$966,762

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	9.03%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.75%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	15.47%
Lord Abbett Investment Trust-High Yield Fund - Class I	4.97%
Lord Abbett Investment Trust-Income Fund - Class I	9.89%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	6.31%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.03%
Lord Abbett Private Credit Fund	1.22%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	13.90%
Lord Abbett Securities Trust - Value Opportunities Fund - Class I	2.44%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	12.11%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	10.41%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.46%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.04%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000020008

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Balanced Opportunity Fund

Class Name

Class C

Trading Symbol

BFLAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Balanced Opportunity Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$61	1.24%

Expenses Paid, Amount

$ 61

Expense Ratio, Percent

1.24%

AssetsNet

$ 1,923,224,408

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 966,762

InvestmentCompanyPortfolioTurnover

8.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$1,923,224,408
# of Portfolio Holdings	15
Portfolio Turnover Rate	8%
Total Advisory Fees Paid	$966,762

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	9.03%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.75%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	15.47%
Lord Abbett Investment Trust-High Yield Fund - Class I	4.97%
Lord Abbett Investment Trust-Income Fund - Class I	9.89%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	6.31%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.03%
Lord Abbett Private Credit Fund	1.22%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	13.90%
Lord Abbett Securities Trust - Value Opportunities Fund - Class I	2.44%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	12.11%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	10.41%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.46%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.04%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054900

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Balanced Opportunity Fund

Class Name

Class F

Trading Symbol

BLAFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Balanced Opportunity Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F	$17	0.34%

Expenses Paid, Amount

$ 17

Expense Ratio, Percent

0.34%

AssetsNet

$ 1,923,224,408

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 966,762

InvestmentCompanyPortfolioTurnover

8.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$1,923,224,408
# of Portfolio Holdings	15
Portfolio Turnover Rate	8%
Total Advisory Fees Paid	$966,762

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	9.03%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.75%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	15.47%
Lord Abbett Investment Trust-High Yield Fund - Class I	4.97%
Lord Abbett Investment Trust-Income Fund - Class I	9.89%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	6.31%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.03%
Lord Abbett Private Credit Fund	1.22%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	13.90%
Lord Abbett Securities Trust - Value Opportunities Fund - Class I	2.44%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	12.11%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	10.41%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.46%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.04%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000188244

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Balanced Opportunity Fund

Class Name

Class F3

Trading Symbol

LOBFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Balanced Opportunity Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F3	$8	0.17%

Expenses Paid, Amount

$ 8

Expense Ratio, Percent

0.17%

AssetsNet

$ 1,923,224,408

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 966,762

InvestmentCompanyPortfolioTurnover

8.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$1,923,224,408
# of Portfolio Holdings	15
Portfolio Turnover Rate	8%
Total Advisory Fees Paid	$966,762

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	9.03%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.75%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	15.47%
Lord Abbett Investment Trust-High Yield Fund - Class I	4.97%
Lord Abbett Investment Trust-Income Fund - Class I	9.89%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	6.31%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.03%
Lord Abbett Private Credit Fund	1.22%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	13.90%
Lord Abbett Securities Trust - Value Opportunities Fund - Class I	2.44%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	12.11%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	10.41%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.46%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.04%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000020005

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Balanced Opportunity Fund

Class Name

Class I

Trading Symbol

LABYX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Balanced Opportunity Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$12	0.24%

Expenses Paid, Amount

$ 12

Expense Ratio, Percent

0.24%

AssetsNet

$ 1,923,224,408

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 966,762

InvestmentCompanyPortfolioTurnover

8.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$1,923,224,408
# of Portfolio Holdings	15
Portfolio Turnover Rate	8%
Total Advisory Fees Paid	$966,762

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	9.03%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.75%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	15.47%
Lord Abbett Investment Trust-High Yield Fund - Class I	4.97%
Lord Abbett Investment Trust-Income Fund - Class I	9.89%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	6.31%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.03%
Lord Abbett Private Credit Fund	1.22%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	13.90%
Lord Abbett Securities Trust - Value Opportunities Fund - Class I	2.44%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	12.11%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	10.41%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.46%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.04%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000020009

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Balanced Opportunity Fund

Class Name

Class P

Trading Symbol

LABPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Balanced Opportunity Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class P	$34	0.68%

Expenses Paid, Amount

$ 34

Expense Ratio, Percent

0.68%

AssetsNet

$ 1,923,224,408

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 966,762

InvestmentCompanyPortfolioTurnover

8.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$1,923,224,408
# of Portfolio Holdings	15
Portfolio Turnover Rate	8%
Total Advisory Fees Paid	$966,762

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	9.03%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.75%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	15.47%
Lord Abbett Investment Trust-High Yield Fund - Class I	4.97%
Lord Abbett Investment Trust-Income Fund - Class I	9.89%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	6.31%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.03%
Lord Abbett Private Credit Fund	1.22%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	13.90%
Lord Abbett Securities Trust - Value Opportunities Fund - Class I	2.44%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	12.11%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	10.41%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.46%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.04%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054901

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Balanced Opportunity Fund

Class Name

Class R2

Trading Symbol

BLAQX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Balanced Opportunity Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R2	$42	0.84%

Expenses Paid, Amount

$ 42

Expense Ratio, Percent

0.84%

AssetsNet

$ 1,923,224,408

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 966,762

InvestmentCompanyPortfolioTurnover

8.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$1,923,224,408
# of Portfolio Holdings	15
Portfolio Turnover Rate	8%
Total Advisory Fees Paid	$966,762

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	9.03%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.75%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	15.47%
Lord Abbett Investment Trust-High Yield Fund - Class I	4.97%
Lord Abbett Investment Trust-Income Fund - Class I	9.89%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	6.31%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.03%
Lord Abbett Private Credit Fund	1.22%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	13.90%
Lord Abbett Securities Trust - Value Opportunities Fund - Class I	2.44%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	12.11%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	10.41%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.46%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.04%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054902

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Balanced Opportunity Fund

Class Name

Class R3

Trading Symbol

BLARX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Balanced Opportunity Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R3	$37	0.74%

Expenses Paid, Amount

$ 37

Expense Ratio, Percent

0.74%

AssetsNet

$ 1,923,224,408

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 966,762

InvestmentCompanyPortfolioTurnover

8.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$1,923,224,408
# of Portfolio Holdings	15
Portfolio Turnover Rate	8%
Total Advisory Fees Paid	$966,762

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	9.03%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.75%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	15.47%
Lord Abbett Investment Trust-High Yield Fund - Class I	4.97%
Lord Abbett Investment Trust-Income Fund - Class I	9.89%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	6.31%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.03%
Lord Abbett Private Credit Fund	1.22%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	13.90%
Lord Abbett Securities Trust - Value Opportunities Fund - Class I	2.44%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	12.11%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	10.41%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.46%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.04%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156635

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Balanced Opportunity Fund

Class Name

Class R4

Trading Symbol

BLASX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Balanced Opportunity Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R4	$24	0.49%

Expenses Paid, Amount

$ 24

Expense Ratio, Percent

0.49%

AssetsNet

$ 1,923,224,408

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 966,762

InvestmentCompanyPortfolioTurnover

8.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$1,923,224,408
# of Portfolio Holdings	15
Portfolio Turnover Rate	8%
Total Advisory Fees Paid	$966,762

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	9.03%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.75%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	15.47%
Lord Abbett Investment Trust-High Yield Fund - Class I	4.97%
Lord Abbett Investment Trust-Income Fund - Class I	9.89%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	6.31%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.03%
Lord Abbett Private Credit Fund	1.22%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	13.90%
Lord Abbett Securities Trust - Value Opportunities Fund - Class I	2.44%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	12.11%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	10.41%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.46%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.04%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156636

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Balanced Opportunity Fund

Class Name

Class R5

Trading Symbol

BLATX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Balanced Opportunity Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R5	$11	0.23%

Expenses Paid, Amount

$ 11

Expense Ratio, Percent

0.23%

AssetsNet

$ 1,923,224,408

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 966,762

InvestmentCompanyPortfolioTurnover

8.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$1,923,224,408
# of Portfolio Holdings	15
Portfolio Turnover Rate	8%
Total Advisory Fees Paid	$966,762

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	9.03%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.75%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	15.47%
Lord Abbett Investment Trust-High Yield Fund - Class I	4.97%
Lord Abbett Investment Trust-Income Fund - Class I	9.89%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	6.31%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.03%
Lord Abbett Private Credit Fund	1.22%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	13.90%
Lord Abbett Securities Trust - Value Opportunities Fund - Class I	2.44%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	12.11%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	10.41%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.46%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.04%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156637

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Balanced Opportunity Fund

Class Name

Class R6

Trading Symbol

BLAVX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Balanced Opportunity Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$8	0.17%

Expenses Paid, Amount

$ 8

Expense Ratio, Percent

0.17%

AssetsNet

$ 1,923,224,408

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 966,762

InvestmentCompanyPortfolioTurnover

8.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$1,923,224,408
# of Portfolio Holdings	15
Portfolio Turnover Rate	8%
Total Advisory Fees Paid	$966,762

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	9.03%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.75%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	15.47%
Lord Abbett Investment Trust-High Yield Fund - Class I	4.97%
Lord Abbett Investment Trust-Income Fund - Class I	9.89%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	6.31%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.03%
Lord Abbett Private Credit Fund	1.22%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	13.90%
Lord Abbett Securities Trust - Value Opportunities Fund - Class I	2.44%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	12.11%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	10.41%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.46%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.04%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000020010

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Income Fund

Class Name

Class A

Trading Symbol

ISFAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$24	0.49%

Expenses Paid, Amount

$ 24

Expense Ratio, Percent

0.49%

AssetsNet

$ 770,750,581

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 389,457

InvestmentCompanyPortfolioTurnover

5.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$770,750,581
# of Portfolio Holdings	14
Portfolio Turnover Rate	5%
Total Advisory Fees Paid	$389,457

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	5.10%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.47%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	34.12%
Lord Abbett Investment Trust-High Yield Fund - Class I	7.71%
Lord Abbett Investment Trust-Income Fund - Class I	11.36%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	4.64%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.61%
Lord Abbett Private Credit Fund	1.34%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	7.73%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	7.03%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	5.95%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.95%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.02%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000020012

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Income Fund

Class Name

Class C

Trading Symbol

ISFCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$62	1.24%

Expenses Paid, Amount

$ 62

Expense Ratio, Percent

1.24%

AssetsNet

$ 770,750,581

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 389,457

InvestmentCompanyPortfolioTurnover

5.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$770,750,581
# of Portfolio Holdings	14
Portfolio Turnover Rate	5%
Total Advisory Fees Paid	$389,457

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	5.10%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.47%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	34.12%
Lord Abbett Investment Trust-High Yield Fund - Class I	7.71%
Lord Abbett Investment Trust-Income Fund - Class I	11.36%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	4.64%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.61%
Lord Abbett Private Credit Fund	1.34%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	7.73%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	7.03%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	5.95%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.95%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.02%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054903

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Income Fund

Class Name

Class F

Trading Symbol

LIGFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F	$17	0.34%

Expenses Paid, Amount

$ 17

Expense Ratio, Percent

0.34%

AssetsNet

$ 770,750,581

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 389,457

InvestmentCompanyPortfolioTurnover

5.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$770,750,581
# of Portfolio Holdings	14
Portfolio Turnover Rate	5%
Total Advisory Fees Paid	$389,457

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	5.10%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.47%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	34.12%
Lord Abbett Investment Trust-High Yield Fund - Class I	7.71%
Lord Abbett Investment Trust-Income Fund - Class I	11.36%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	4.64%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.61%
Lord Abbett Private Credit Fund	1.34%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	7.73%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	7.03%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	5.95%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.95%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.02%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000188246

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Income Fund

Class Name

Class F3

Trading Symbol

ISFOX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F3	$9	0.19%

Expenses Paid, Amount

$ 9

Expense Ratio, Percent

0.19%

AssetsNet

$ 770,750,581

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 389,457

InvestmentCompanyPortfolioTurnover

5.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$770,750,581
# of Portfolio Holdings	14
Portfolio Turnover Rate	5%
Total Advisory Fees Paid	$389,457

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	5.10%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.47%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	34.12%
Lord Abbett Investment Trust-High Yield Fund - Class I	7.71%
Lord Abbett Investment Trust-Income Fund - Class I	11.36%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	4.64%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.61%
Lord Abbett Private Credit Fund	1.34%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	7.73%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	7.03%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	5.95%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.95%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.02%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000020014

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Income Fund

Class Name

Class I

Trading Symbol

ISFYX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$12	0.24%

Expenses Paid, Amount

$ 12

Expense Ratio, Percent

0.24%

AssetsNet

$ 770,750,581

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 389,457

InvestmentCompanyPortfolioTurnover

5.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$770,750,581
# of Portfolio Holdings	14
Portfolio Turnover Rate	5%
Total Advisory Fees Paid	$389,457

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	5.10%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.47%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	34.12%
Lord Abbett Investment Trust-High Yield Fund - Class I	7.71%
Lord Abbett Investment Trust-Income Fund - Class I	11.36%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	4.64%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.61%
Lord Abbett Private Credit Fund	1.34%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	7.73%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	7.03%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	5.95%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.95%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.02%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054904

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Income Fund

Class Name

Class R2

Trading Symbol

LIGQX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R2	$42	0.84%

Expenses Paid, Amount

$ 42

Expense Ratio, Percent

0.84%

AssetsNet

$ 770,750,581

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 389,457

InvestmentCompanyPortfolioTurnover

5.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$770,750,581
# of Portfolio Holdings	14
Portfolio Turnover Rate	5%
Total Advisory Fees Paid	$389,457

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	5.10%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.47%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	34.12%
Lord Abbett Investment Trust-High Yield Fund - Class I	7.71%
Lord Abbett Investment Trust-Income Fund - Class I	11.36%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	4.64%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.61%
Lord Abbett Private Credit Fund	1.34%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	7.73%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	7.03%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	5.95%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.95%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.02%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054905

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Income Fund

Class Name

Class R3

Trading Symbol

LIXRX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R3	$37	0.74%

Expenses Paid, Amount

$ 37

Expense Ratio, Percent

0.74%

AssetsNet

$ 770,750,581

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 389,457

InvestmentCompanyPortfolioTurnover

5.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$770,750,581
# of Portfolio Holdings	14
Portfolio Turnover Rate	5%
Total Advisory Fees Paid	$389,457

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	5.10%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.47%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	34.12%
Lord Abbett Investment Trust-High Yield Fund - Class I	7.71%
Lord Abbett Investment Trust-Income Fund - Class I	11.36%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	4.64%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.61%
Lord Abbett Private Credit Fund	1.34%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	7.73%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	7.03%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	5.95%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.95%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.02%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156638

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Income Fund

Class Name

Class R4

Trading Symbol

LIXSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R4	$24	0.49%

Expenses Paid, Amount

$ 24

Expense Ratio, Percent

0.49%

AssetsNet

$ 770,750,581

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 389,457

InvestmentCompanyPortfolioTurnover

5.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$770,750,581
# of Portfolio Holdings	14
Portfolio Turnover Rate	5%
Total Advisory Fees Paid	$389,457

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	5.10%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.47%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	34.12%
Lord Abbett Investment Trust-High Yield Fund - Class I	7.71%
Lord Abbett Investment Trust-Income Fund - Class I	11.36%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	4.64%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.61%
Lord Abbett Private Credit Fund	1.34%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	7.73%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	7.03%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	5.95%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.95%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.02%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156639

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Income Fund

Class Name

Class R5

Trading Symbol

LIXTX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R5	$10	0.21%

Expenses Paid, Amount

$ 10

Expense Ratio, Percent

0.21%

AssetsNet

$ 770,750,581

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 389,457

InvestmentCompanyPortfolioTurnover

5.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$770,750,581
# of Portfolio Holdings	14
Portfolio Turnover Rate	5%
Total Advisory Fees Paid	$389,457

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	5.10%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.47%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	34.12%
Lord Abbett Investment Trust-High Yield Fund - Class I	7.71%
Lord Abbett Investment Trust-Income Fund - Class I	11.36%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	4.64%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.61%
Lord Abbett Private Credit Fund	1.34%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	7.73%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	7.03%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	5.95%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.95%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.02%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156640

Shareholder Report [Line Items]

Fund Name

Lord Abbett Multi-Asset Income Fund

Class Name

Class R6

Trading Symbol

LIXVX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Multi-Asset Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$9	0.18%

Expenses Paid, Amount

$ 9

Expense Ratio, Percent

0.18%

AssetsNet

$ 770,750,581

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 389,457

InvestmentCompanyPortfolioTurnover

5.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$770,750,581
# of Portfolio Holdings	14
Portfolio Turnover Rate	5%
Total Advisory Fees Paid	$389,457

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Lord Abbett Affiliated Fund, Inc. - Class I	5.10%
Lord Abbett Global Fund, Inc.-Emerging Markets Bond Fund - Class I	3.47%
Lord Abbett Investment Trust-Core Fixed Income Fund - Class I	34.12%
Lord Abbett Investment Trust-High Yield Fund - Class I	7.71%
Lord Abbett Investment Trust-Income Fund - Class I	11.36%
Lord Abbett Investment Trust-Short Duration Income Fund - Class I	4.64%
Lord Abbett Investment Trust-Ultra Short Bond Fund - Class I	2.61%
Lord Abbett Private Credit Fund	1.34%
Lord Abbett Research Fund, Inc.-Dividend Growth Fund - Class I	7.73%
Lord Abbett Securities Trust-Fundamental Equity Fund - Class I	7.03%
Lord Abbett Securities Trust-Growth Leaders Fund - Class I	5.95%
Lord Abbett Securities Trust-International Equity Fund - Class I	4.95%
Lord Abbett Securities Trust-International Value Fund - Class I	3.97%
Repurchase Agreements	0.02%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000180461

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Core Bond Fund

Class Name

Class A

Trading Symbol

LDCAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Core Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$30	0.60%

Expenses Paid, Amount

$ 30

Expense Ratio, Percent

0.60%

AssetsNet

$ 600,191,910

Holdings Count | Holding

490

Advisory Fees Paid, Amount

$ 566,923

InvestmentCompanyPortfolioTurnover

70.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$600,191,910
# of Portfolio Holdings	490
Portfolio Turnover Rate	70%
Total Advisory Fees Paid	$566,923

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	19.71%
Commercial Paper	0.67%
Corporate Bonds	46.06%
Floating Rate Loans	3.52%
Foreign Government Obligations	1.01%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	3.27%
Non-Agency Commercial Mortgage-Backed Securities	3.02%
U.S. Treasury Obligations	21.44%
Repurchase Agreements	1.22%
Money Market Funds^{Footnote Reference(a)}	0.07%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000180462

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Core Bond Fund

Class Name

Class C

Trading Symbol

LDCCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Core Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$64	1.27%

Expenses Paid, Amount

$ 64

Expense Ratio, Percent

1.27%

AssetsNet

$ 600,191,910

Holdings Count | Holding

490

Advisory Fees Paid, Amount

$ 566,923

InvestmentCompanyPortfolioTurnover

70.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$600,191,910
# of Portfolio Holdings	490
Portfolio Turnover Rate	70%
Total Advisory Fees Paid	$566,923

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	19.71%
Commercial Paper	0.67%
Corporate Bonds	46.06%
Floating Rate Loans	3.52%
Foreign Government Obligations	1.01%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	3.27%
Non-Agency Commercial Mortgage-Backed Securities	3.02%
U.S. Treasury Obligations	21.44%
Repurchase Agreements	1.22%
Money Market Funds^{Footnote Reference(a)}	0.07%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000180463

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Core Bond Fund

Class Name

Class F

Trading Symbol

LDCFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Core Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F	$25	0.50%

Expenses Paid, Amount

$ 25

Expense Ratio, Percent

0.50%

AssetsNet

$ 600,191,910

Holdings Count | Holding

490

Advisory Fees Paid, Amount

$ 566,923

InvestmentCompanyPortfolioTurnover

70.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$600,191,910
# of Portfolio Holdings	490
Portfolio Turnover Rate	70%
Total Advisory Fees Paid	$566,923

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	19.71%
Commercial Paper	0.67%
Corporate Bonds	46.06%
Floating Rate Loans	3.52%
Foreign Government Obligations	1.01%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	3.27%
Non-Agency Commercial Mortgage-Backed Securities	3.02%
U.S. Treasury Obligations	21.44%
Repurchase Agreements	1.22%
Money Market Funds^{Footnote Reference(a)}	0.07%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000180464

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Core Bond Fund

Class Name

Class F3

Trading Symbol

LSCOX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Core Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F3	$16	0.31%

Expenses Paid, Amount

$ 16

Expense Ratio, Percent

0.31%

AssetsNet

$ 600,191,910

Holdings Count | Holding

490

Advisory Fees Paid, Amount

$ 566,923

InvestmentCompanyPortfolioTurnover

70.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$600,191,910
# of Portfolio Holdings	490
Portfolio Turnover Rate	70%
Total Advisory Fees Paid	$566,923

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	19.71%
Commercial Paper	0.67%
Corporate Bonds	46.06%
Floating Rate Loans	3.52%
Foreign Government Obligations	1.01%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	3.27%
Non-Agency Commercial Mortgage-Backed Securities	3.02%
U.S. Treasury Obligations	21.44%
Repurchase Agreements	1.22%
Money Market Funds^{Footnote Reference(a)}	0.07%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000180465

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Core Bond Fund

Class Name

Class I

Trading Symbol

LSCIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Core Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$20	0.40%

Expenses Paid, Amount

$ 20

Expense Ratio, Percent

0.40%

AssetsNet

$ 600,191,910

Holdings Count | Holding

490

Advisory Fees Paid, Amount

$ 566,923

InvestmentCompanyPortfolioTurnover

70.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$600,191,910
# of Portfolio Holdings	490
Portfolio Turnover Rate	70%
Total Advisory Fees Paid	$566,923

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	19.71%
Commercial Paper	0.67%
Corporate Bonds	46.06%
Floating Rate Loans	3.52%
Foreign Government Obligations	1.01%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	3.27%
Non-Agency Commercial Mortgage-Backed Securities	3.02%
U.S. Treasury Obligations	21.44%
Repurchase Agreements	1.22%
Money Market Funds^{Footnote Reference(a)}	0.07%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000180467

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Core Bond Fund

Class Name

Class R3

Trading Symbol

LDCRX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Core Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R3	$45	0.90%

Expenses Paid, Amount

$ 45

Expense Ratio, Percent

0.90%

AssetsNet

$ 600,191,910

Holdings Count | Holding

490

Advisory Fees Paid, Amount

$ 566,923

InvestmentCompanyPortfolioTurnover

70.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$600,191,910
# of Portfolio Holdings	490
Portfolio Turnover Rate	70%
Total Advisory Fees Paid	$566,923

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	19.71%
Commercial Paper	0.67%
Corporate Bonds	46.06%
Floating Rate Loans	3.52%
Foreign Government Obligations	1.01%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	3.27%
Non-Agency Commercial Mortgage-Backed Securities	3.02%
U.S. Treasury Obligations	21.44%
Repurchase Agreements	1.22%
Money Market Funds^{Footnote Reference(a)}	0.07%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000180468

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Core Bond Fund

Class Name

Class R4

Trading Symbol

LSCSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Core Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R4	$33	0.65%

Expenses Paid, Amount

$ 33

Expense Ratio, Percent

0.65%

AssetsNet

$ 600,191,910

Holdings Count | Holding

490

Advisory Fees Paid, Amount

$ 566,923

InvestmentCompanyPortfolioTurnover

70.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$600,191,910
# of Portfolio Holdings	490
Portfolio Turnover Rate	70%
Total Advisory Fees Paid	$566,923

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	19.71%
Commercial Paper	0.67%
Corporate Bonds	46.06%
Floating Rate Loans	3.52%
Foreign Government Obligations	1.01%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	3.27%
Non-Agency Commercial Mortgage-Backed Securities	3.02%
U.S. Treasury Obligations	21.44%
Repurchase Agreements	1.22%
Money Market Funds^{Footnote Reference(a)}	0.07%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000180469

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Core Bond Fund

Class Name

Class R5

Trading Symbol

LSCUX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Core Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R5	$20	0.39%

Expenses Paid, Amount

$ 20

Expense Ratio, Percent

0.39%

AssetsNet

$ 600,191,910

Holdings Count | Holding

490

Advisory Fees Paid, Amount

$ 566,923

InvestmentCompanyPortfolioTurnover

70.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$600,191,910
# of Portfolio Holdings	490
Portfolio Turnover Rate	70%
Total Advisory Fees Paid	$566,923

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	19.71%
Commercial Paper	0.67%
Corporate Bonds	46.06%
Floating Rate Loans	3.52%
Foreign Government Obligations	1.01%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	3.27%
Non-Agency Commercial Mortgage-Backed Securities	3.02%
U.S. Treasury Obligations	21.44%
Repurchase Agreements	1.22%
Money Market Funds^{Footnote Reference(a)}	0.07%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000180470

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Core Bond Fund

Class Name

Class R6

Trading Symbol

LDCVX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Core Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$16	0.31%

Expenses Paid, Amount

$ 16

Expense Ratio, Percent

0.31%

AssetsNet

$ 600,191,910

Holdings Count | Holding

490

Advisory Fees Paid, Amount

$ 566,923

InvestmentCompanyPortfolioTurnover

70.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$600,191,910
# of Portfolio Holdings	490
Portfolio Turnover Rate	70%
Total Advisory Fees Paid	$566,923

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	19.71%
Commercial Paper	0.67%
Corporate Bonds	46.06%
Floating Rate Loans	3.52%
Foreign Government Obligations	1.01%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.00%^{Footnote Reference**}
Government Sponsored Enterprises Pass-Throughs	3.27%
Non-Agency Commercial Mortgage-Backed Securities	3.02%
U.S. Treasury Obligations	21.44%
Repurchase Agreements	1.22%
Money Market Funds^{Footnote Reference(a)}	0.07%
Time Deposits^{Footnote Reference(a)}	0.01%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000019992

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Income Fund

Class Name

Class A

Trading Symbol

LALDX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$30	0.59%

Expenses Paid, Amount

$ 30

Expense Ratio, Percent

0.59%

AssetsNet

$ 42,356,341,341

Holdings Count | Holding

1,115

Advisory Fees Paid, Amount

$ 52,975,495

InvestmentCompanyPortfolioTurnover

73.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$42,356,341,341
# of Portfolio Holdings	1,115
Portfolio Turnover Rate	73%
Total Advisory Fees Paid	$52,975,495

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	18.67%
Commercial Paper	0.08%
Convertible Bonds	0.09%
Corporate Bonds	58.51%
Floating Rate Loans	6.89%
Foreign Government Obligations	1.16%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.47%
Non-Agency Commercial Mortgage-Backed Securities	7.44%
U.S. Treasury Obligations	1.80%
Repurchase Agreements	0.57%
Money Market Funds^{Footnote Reference(a)}	0.27%
Time Deposits^{Footnote Reference(a)}	0.03%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000019994

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Income Fund

Class Name

Class C

Trading Symbol

LDLAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$61	1.21%

Expenses Paid, Amount

$ 61

Expense Ratio, Percent

1.21%

AssetsNet

$ 42,356,341,341

Holdings Count | Holding

1,115

Advisory Fees Paid, Amount

$ 52,975,495

InvestmentCompanyPortfolioTurnover

73.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$42,356,341,341
# of Portfolio Holdings	1,115
Portfolio Turnover Rate	73%
Total Advisory Fees Paid	$52,975,495

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	18.67%
Commercial Paper	0.08%
Convertible Bonds	0.09%
Corporate Bonds	58.51%
Floating Rate Loans	6.89%
Foreign Government Obligations	1.16%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.47%
Non-Agency Commercial Mortgage-Backed Securities	7.44%
U.S. Treasury Obligations	1.80%
Repurchase Agreements	0.57%
Money Market Funds^{Footnote Reference(a)}	0.27%
Time Deposits^{Footnote Reference(a)}	0.03%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054891

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Income Fund

Class Name

Class F

Trading Symbol

LDLFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F	$25	0.49%

Expenses Paid, Amount

$ 25

Expense Ratio, Percent

0.49%

AssetsNet

$ 42,356,341,341

Holdings Count | Holding

1,115

Advisory Fees Paid, Amount

$ 52,975,495

InvestmentCompanyPortfolioTurnover

73.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$42,356,341,341
# of Portfolio Holdings	1,115
Portfolio Turnover Rate	73%
Total Advisory Fees Paid	$52,975,495

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	18.67%
Commercial Paper	0.08%
Convertible Bonds	0.09%
Corporate Bonds	58.51%
Floating Rate Loans	6.89%
Foreign Government Obligations	1.16%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.47%
Non-Agency Commercial Mortgage-Backed Securities	7.44%
U.S. Treasury Obligations	1.80%
Repurchase Agreements	0.57%
Money Market Funds^{Footnote Reference(a)}	0.27%
Time Deposits^{Footnote Reference(a)}	0.03%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000188238

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Income Fund

Class Name

Class F3

Trading Symbol

LOLDX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F3	$16	0.31%

Expenses Paid, Amount

$ 16

Expense Ratio, Percent

0.31%

AssetsNet

$ 42,356,341,341

Holdings Count | Holding

1,115

Advisory Fees Paid, Amount

$ 52,975,495

InvestmentCompanyPortfolioTurnover

73.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$42,356,341,341
# of Portfolio Holdings	1,115
Portfolio Turnover Rate	73%
Total Advisory Fees Paid	$52,975,495

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	18.67%
Commercial Paper	0.08%
Convertible Bonds	0.09%
Corporate Bonds	58.51%
Floating Rate Loans	6.89%
Foreign Government Obligations	1.16%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.47%
Non-Agency Commercial Mortgage-Backed Securities	7.44%
U.S. Treasury Obligations	1.80%
Repurchase Agreements	0.57%
Money Market Funds^{Footnote Reference(a)}	0.27%
Time Deposits^{Footnote Reference(a)}	0.03%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000019991

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Income Fund

Class Name

Class I

Trading Symbol

LLDYX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$20	0.39%

Expenses Paid, Amount

$ 20

Expense Ratio, Percent

0.39%

AssetsNet

$ 42,356,341,341

Holdings Count | Holding

1,115

Advisory Fees Paid, Amount

$ 52,975,495

InvestmentCompanyPortfolioTurnover

73.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$42,356,341,341
# of Portfolio Holdings	1,115
Portfolio Turnover Rate	73%
Total Advisory Fees Paid	$52,975,495

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	18.67%
Commercial Paper	0.08%
Convertible Bonds	0.09%
Corporate Bonds	58.51%
Floating Rate Loans	6.89%
Foreign Government Obligations	1.16%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.47%
Non-Agency Commercial Mortgage-Backed Securities	7.44%
U.S. Treasury Obligations	1.80%
Repurchase Agreements	0.57%
Money Market Funds^{Footnote Reference(a)}	0.27%
Time Deposits^{Footnote Reference(a)}	0.03%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054892

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Income Fund

Class Name

Class R2

Trading Symbol

LDLQX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R2	$50	0.99%

Expenses Paid, Amount

$ 50

Expense Ratio, Percent

0.99%

AssetsNet

$ 42,356,341,341

Holdings Count | Holding

1,115

Advisory Fees Paid, Amount

$ 52,975,495

InvestmentCompanyPortfolioTurnover

73.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$42,356,341,341
# of Portfolio Holdings	1,115
Portfolio Turnover Rate	73%
Total Advisory Fees Paid	$52,975,495

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	18.67%
Commercial Paper	0.08%
Convertible Bonds	0.09%
Corporate Bonds	58.51%
Floating Rate Loans	6.89%
Foreign Government Obligations	1.16%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.47%
Non-Agency Commercial Mortgage-Backed Securities	7.44%
U.S. Treasury Obligations	1.80%
Repurchase Agreements	0.57%
Money Market Funds^{Footnote Reference(a)}	0.27%
Time Deposits^{Footnote Reference(a)}	0.03%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054893

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Income Fund

Class Name

Class R3

Trading Symbol

LDLRX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R3	$45	0.89%

Expenses Paid, Amount

$ 45

Expense Ratio, Percent

0.89%

AssetsNet

$ 42,356,341,341

Holdings Count | Holding

1,115

Advisory Fees Paid, Amount

$ 52,975,495

InvestmentCompanyPortfolioTurnover

73.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$42,356,341,341
# of Portfolio Holdings	1,115
Portfolio Turnover Rate	73%
Total Advisory Fees Paid	$52,975,495

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	18.67%
Commercial Paper	0.08%
Convertible Bonds	0.09%
Corporate Bonds	58.51%
Floating Rate Loans	6.89%
Foreign Government Obligations	1.16%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.47%
Non-Agency Commercial Mortgage-Backed Securities	7.44%
U.S. Treasury Obligations	1.80%
Repurchase Agreements	0.57%
Money Market Funds^{Footnote Reference(a)}	0.27%
Time Deposits^{Footnote Reference(a)}	0.03%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156626

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Income Fund

Class Name

Class R4

Trading Symbol

LDLKX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R4	$32	0.64%

Expenses Paid, Amount

$ 32

Expense Ratio, Percent

0.64%

AssetsNet

$ 42,356,341,341

Holdings Count | Holding

1,115

Advisory Fees Paid, Amount

$ 52,975,495

InvestmentCompanyPortfolioTurnover

73.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$42,356,341,341
# of Portfolio Holdings	1,115
Portfolio Turnover Rate	73%
Total Advisory Fees Paid	$52,975,495

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	18.67%
Commercial Paper	0.08%
Convertible Bonds	0.09%
Corporate Bonds	58.51%
Floating Rate Loans	6.89%
Foreign Government Obligations	1.16%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.47%
Non-Agency Commercial Mortgage-Backed Securities	7.44%
U.S. Treasury Obligations	1.80%
Repurchase Agreements	0.57%
Money Market Funds^{Footnote Reference(a)}	0.27%
Time Deposits^{Footnote Reference(a)}	0.03%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156627

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Income Fund

Class Name

Class R5

Trading Symbol

LDLTX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R5	$20	0.39%

Expenses Paid, Amount

$ 20

Expense Ratio, Percent

0.39%

AssetsNet

$ 42,356,341,341

Holdings Count | Holding

1,115

Advisory Fees Paid, Amount

$ 52,975,495

InvestmentCompanyPortfolioTurnover

73.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$42,356,341,341
# of Portfolio Holdings	1,115
Portfolio Turnover Rate	73%
Total Advisory Fees Paid	$52,975,495

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	18.67%
Commercial Paper	0.08%
Convertible Bonds	0.09%
Corporate Bonds	58.51%
Floating Rate Loans	6.89%
Foreign Government Obligations	1.16%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.47%
Non-Agency Commercial Mortgage-Backed Securities	7.44%
U.S. Treasury Obligations	1.80%
Repurchase Agreements	0.57%
Money Market Funds^{Footnote Reference(a)}	0.27%
Time Deposits^{Footnote Reference(a)}	0.03%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156628

Shareholder Report [Line Items]

Fund Name

Lord Abbett Short Duration Income Fund

Class Name

Class R6

Trading Symbol

LDLVX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Income Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$16	0.31%

Expenses Paid, Amount

$ 16

Expense Ratio, Percent

0.31%

AssetsNet

$ 42,356,341,341

Holdings Count | Holding

1,115

Advisory Fees Paid, Amount

$ 52,975,495

InvestmentCompanyPortfolioTurnover

73.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$42,356,341,341
# of Portfolio Holdings	1,115
Portfolio Turnover Rate	73%
Total Advisory Fees Paid	$52,975,495

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	18.67%
Commercial Paper	0.08%
Convertible Bonds	0.09%
Corporate Bonds	58.51%
Floating Rate Loans	6.89%
Foreign Government Obligations	1.16%
Government Sponsored Enterprises Collateralized Mortgage Obligations	0.02%
Government Sponsored Enterprises Pass-Throughs	4.47%
Non-Agency Commercial Mortgage-Backed Securities	7.44%
U.S. Treasury Obligations	1.80%
Repurchase Agreements	0.57%
Money Market Funds^{Footnote Reference(a)}	0.27%
Time Deposits^{Footnote Reference(a)}	0.03%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000173880

Shareholder Report [Line Items]

Fund Name

Lord Abbett Ultra Short Bond Fund

Class Name

Class A

Trading Symbol

LUBAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Ultra Short Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$22	0.43%

Expenses Paid, Amount

$ 22

Expense Ratio, Percent

0.43%

AssetsNet

$ 13,098,608,841

Holdings Count | Holding

559

Advisory Fees Paid, Amount

$ 10,475,567

InvestmentCompanyPortfolioTurnover

36.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$13,098,608,841
# of Portfolio Holdings	559
Portfolio Turnover Rate	36%
Total Advisory Fees Paid	$10,475,567

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	27.73%
Commercial Paper	5.58%
Corporate Bonds	53.49%
Floating Rate Loans	4.08%
Foreign Government Obligations	0.87%
Non-Agency Commercial Mortgage-Backed Securities	5.73%
U.S. Treasury Obligations	2.49%
Money Market Funds^{Footnote Reference(a)}	0.03%
Time Deposits^{Footnote Reference(a)}	0.00%^{Footnote Reference**}
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000213736

Shareholder Report [Line Items]

Fund Name

Lord Abbett Ultra Short Bond Fund

Class Name

Class A1

Trading Symbol

LUSNX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Ultra Short Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A1	$27	0.53%

Expenses Paid, Amount

$ 27

Expense Ratio, Percent

0.53%

AssetsNet

$ 13,098,608,841

Holdings Count | Holding

559

Advisory Fees Paid, Amount

$ 10,475,567

InvestmentCompanyPortfolioTurnover

36.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$13,098,608,841
# of Portfolio Holdings	559
Portfolio Turnover Rate	36%
Total Advisory Fees Paid	$10,475,567

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	27.73%
Commercial Paper	5.58%
Corporate Bonds	53.49%
Floating Rate Loans	4.08%
Foreign Government Obligations	0.87%
Non-Agency Commercial Mortgage-Backed Securities	5.73%
U.S. Treasury Obligations	2.49%
Money Market Funds^{Footnote Reference(a)}	0.03%
Time Deposits^{Footnote Reference(a)}	0.00%^{Footnote Reference**}
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000173881

Shareholder Report [Line Items]

Fund Name

Lord Abbett Ultra Short Bond Fund

Class Name

Class F

Trading Symbol

LUBFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Ultra Short Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F	$19	0.38%

Expenses Paid, Amount

$ 19

Expense Ratio, Percent

0.38%

AssetsNet

$ 13,098,608,841

Holdings Count | Holding

559

Advisory Fees Paid, Amount

$ 10,475,567

InvestmentCompanyPortfolioTurnover

36.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$13,098,608,841
# of Portfolio Holdings	559
Portfolio Turnover Rate	36%
Total Advisory Fees Paid	$10,475,567

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	27.73%
Commercial Paper	5.58%
Corporate Bonds	53.49%
Floating Rate Loans	4.08%
Foreign Government Obligations	0.87%
Non-Agency Commercial Mortgage-Backed Securities	5.73%
U.S. Treasury Obligations	2.49%
Money Market Funds^{Footnote Reference(a)}	0.03%
Time Deposits^{Footnote Reference(a)}	0.00%^{Footnote Reference**}
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000188258

Shareholder Report [Line Items]

Fund Name

Lord Abbett Ultra Short Bond Fund

Class Name

Class F3

Trading Symbol

LUBOX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Ultra Short Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F3	$12	0.23%

Expenses Paid, Amount

$ 12

Expense Ratio, Percent

0.23%

AssetsNet

$ 13,098,608,841

Holdings Count | Holding

559

Advisory Fees Paid, Amount

$ 10,475,567

InvestmentCompanyPortfolioTurnover

36.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$13,098,608,841
# of Portfolio Holdings	559
Portfolio Turnover Rate	36%
Total Advisory Fees Paid	$10,475,567

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	27.73%
Commercial Paper	5.58%
Corporate Bonds	53.49%
Floating Rate Loans	4.08%
Foreign Government Obligations	0.87%
Non-Agency Commercial Mortgage-Backed Securities	5.73%
U.S. Treasury Obligations	2.49%
Money Market Funds^{Footnote Reference(a)}	0.03%
Time Deposits^{Footnote Reference(a)}	0.00%^{Footnote Reference**}
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000173882

Shareholder Report [Line Items]

Fund Name

Lord Abbett Ultra Short Bond Fund

Class Name

Class I

Trading Symbol

LUBYX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Ultra Short Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$14	0.28%

Expenses Paid, Amount

$ 14

Expense Ratio, Percent

0.28%

AssetsNet

$ 13,098,608,841

Holdings Count | Holding

559

Advisory Fees Paid, Amount

$ 10,475,567

InvestmentCompanyPortfolioTurnover

36.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$13,098,608,841
# of Portfolio Holdings	559
Portfolio Turnover Rate	36%
Total Advisory Fees Paid	$10,475,567

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	27.73%
Commercial Paper	5.58%
Corporate Bonds	53.49%
Floating Rate Loans	4.08%
Foreign Government Obligations	0.87%
Non-Agency Commercial Mortgage-Backed Securities	5.73%
U.S. Treasury Obligations	2.49%
Money Market Funds^{Footnote Reference(a)}	0.03%
Time Deposits^{Footnote Reference(a)}	0.00%^{Footnote Reference**}
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000173883

Shareholder Report [Line Items]

Fund Name

Lord Abbett Ultra Short Bond Fund

Class Name

Class R5

Trading Symbol

LUBVX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Ultra Short Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R5	$14	0.28%

Expenses Paid, Amount

$ 14

Expense Ratio, Percent

0.28%

AssetsNet

$ 13,098,608,841

Holdings Count | Holding

559

Advisory Fees Paid, Amount

$ 10,475,567

InvestmentCompanyPortfolioTurnover

36.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$13,098,608,841
# of Portfolio Holdings	559
Portfolio Turnover Rate	36%
Total Advisory Fees Paid	$10,475,567

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	27.73%
Commercial Paper	5.58%
Corporate Bonds	53.49%
Floating Rate Loans	4.08%
Foreign Government Obligations	0.87%
Non-Agency Commercial Mortgage-Backed Securities	5.73%
U.S. Treasury Obligations	2.49%
Money Market Funds^{Footnote Reference(a)}	0.03%
Time Deposits^{Footnote Reference(a)}	0.00%^{Footnote Reference**}
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000173884

Shareholder Report [Line Items]

Fund Name

Lord Abbett Ultra Short Bond Fund

Class Name

Class R6

Trading Symbol

LUBWX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Ultra Short Bond Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$12	0.23%

Expenses Paid, Amount

$ 12

Expense Ratio, Percent

0.23%

AssetsNet

$ 13,098,608,841

Holdings Count | Holding

559

Advisory Fees Paid, Amount

$ 10,475,567

InvestmentCompanyPortfolioTurnover

36.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$13,098,608,841
# of Portfolio Holdings	559
Portfolio Turnover Rate	36%
Total Advisory Fees Paid	$10,475,567

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	27.73%
Commercial Paper	5.58%
Corporate Bonds	53.49%
Floating Rate Loans	4.08%
Foreign Government Obligations	0.87%
Non-Agency Commercial Mortgage-Backed Securities	5.73%
U.S. Treasury Obligations	2.49%
Money Market Funds^{Footnote Reference(a)}	0.03%
Time Deposits^{Footnote Reference(a)}	0.00%^{Footnote Reference**}
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote**	Amount is less than 0.01%
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000019995

Shareholder Report [Line Items]

Fund Name

Lord Abbett Total Return Fund

Class Name

Class A

Trading Symbol

LTRAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Total Return Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$32	0.64%

Expenses Paid, Amount

$ 32

Expense Ratio, Percent

0.64%

AssetsNet

$ 3,614,608,465

Holdings Count | Holding

543

Advisory Fees Paid, Amount

$ 5,102,298

InvestmentCompanyPortfolioTurnover

212.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,614,608,465
# of Portfolio Holdings	543
Portfolio Turnover Rate	212%
Total Advisory Fees Paid	$5,102,298

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	12.22%
Corporate Bonds	37.84%
Floating Rate Loans	1.32%
Foreign Government Obligations	0.14%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.35%
Government Sponsored Enterprises Pass-Throughs	23.60%
Municipal Bonds	0.10%
Non-Agency Commercial Mortgage-Backed Securities	7.35%
U.S. Treasury Obligations	13.57%
Repurchase Agreements	2.02%
Money Market Funds^{Footnote Reference(a)}	0.44%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000019997

Shareholder Report [Line Items]

Fund Name

Lord Abbett Total Return Fund

Class Name

Class C

Trading Symbol

LTRCX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Total Return Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$64	1.28%

Expenses Paid, Amount

$ 64

Expense Ratio, Percent

1.28%

AssetsNet

$ 3,614,608,465

Holdings Count | Holding

543

Advisory Fees Paid, Amount

$ 5,102,298

InvestmentCompanyPortfolioTurnover

212.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,614,608,465
# of Portfolio Holdings	543
Portfolio Turnover Rate	212%
Total Advisory Fees Paid	$5,102,298

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	12.22%
Corporate Bonds	37.84%
Floating Rate Loans	1.32%
Foreign Government Obligations	0.14%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.35%
Government Sponsored Enterprises Pass-Throughs	23.60%
Municipal Bonds	0.10%
Non-Agency Commercial Mortgage-Backed Securities	7.35%
U.S. Treasury Obligations	13.57%
Repurchase Agreements	2.02%
Money Market Funds^{Footnote Reference(a)}	0.44%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054894

Shareholder Report [Line Items]

Fund Name

Lord Abbett Total Return Fund

Class Name

Class F

Trading Symbol

LTRFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Total Return Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F	$27	0.54%

Expenses Paid, Amount

$ 27

Expense Ratio, Percent

0.54%

AssetsNet

$ 3,614,608,465

Holdings Count | Holding

543

Advisory Fees Paid, Amount

$ 5,102,298

InvestmentCompanyPortfolioTurnover

212.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,614,608,465
# of Portfolio Holdings	543
Portfolio Turnover Rate	212%
Total Advisory Fees Paid	$5,102,298

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	12.22%
Corporate Bonds	37.84%
Floating Rate Loans	1.32%
Foreign Government Obligations	0.14%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.35%
Government Sponsored Enterprises Pass-Throughs	23.60%
Municipal Bonds	0.10%
Non-Agency Commercial Mortgage-Backed Securities	7.35%
U.S. Treasury Obligations	13.57%
Repurchase Agreements	2.02%
Money Market Funds^{Footnote Reference(a)}	0.44%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000188241

Shareholder Report [Line Items]

Fund Name

Lord Abbett Total Return Fund

Class Name

Class F3

Trading Symbol

LTROX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Total Return Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class F3	$18	0.35%

Expenses Paid, Amount

$ 18

Expense Ratio, Percent

0.35%

AssetsNet

$ 3,614,608,465

Holdings Count | Holding

543

Advisory Fees Paid, Amount

$ 5,102,298

InvestmentCompanyPortfolioTurnover

212.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,614,608,465
# of Portfolio Holdings	543
Portfolio Turnover Rate	212%
Total Advisory Fees Paid	$5,102,298

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	12.22%
Corporate Bonds	37.84%
Floating Rate Loans	1.32%
Foreign Government Obligations	0.14%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.35%
Government Sponsored Enterprises Pass-Throughs	23.60%
Municipal Bonds	0.10%
Non-Agency Commercial Mortgage-Backed Securities	7.35%
U.S. Treasury Obligations	13.57%
Repurchase Agreements	2.02%
Money Market Funds^{Footnote Reference(a)}	0.44%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000019999

Shareholder Report [Line Items]

Fund Name

Lord Abbett Total Return Fund

Class Name

Class I

Trading Symbol

LTRYX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Total Return Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$20	0.40%

Expenses Paid, Amount

$ 20

Expense Ratio, Percent

0.40%

AssetsNet

$ 3,614,608,465

Holdings Count | Holding

543

Advisory Fees Paid, Amount

$ 5,102,298

InvestmentCompanyPortfolioTurnover

212.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,614,608,465
# of Portfolio Holdings	543
Portfolio Turnover Rate	212%
Total Advisory Fees Paid	$5,102,298

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	12.22%
Corporate Bonds	37.84%
Floating Rate Loans	1.32%
Foreign Government Obligations	0.14%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.35%
Government Sponsored Enterprises Pass-Throughs	23.60%
Municipal Bonds	0.10%
Non-Agency Commercial Mortgage-Backed Securities	7.35%
U.S. Treasury Obligations	13.57%
Repurchase Agreements	2.02%
Money Market Funds^{Footnote Reference(a)}	0.44%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000019998

Shareholder Report [Line Items]

Fund Name

Lord Abbett Total Return Fund

Class Name

Class P

Trading Symbol

LTRPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Total Return Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class P	$43	0.87%

Expenses Paid, Amount

$ 43

Expense Ratio, Percent

0.87%

AssetsNet

$ 3,614,608,465

Holdings Count | Holding

543

Advisory Fees Paid, Amount

$ 5,102,298

InvestmentCompanyPortfolioTurnover

212.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,614,608,465
# of Portfolio Holdings	543
Portfolio Turnover Rate	212%
Total Advisory Fees Paid	$5,102,298

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	12.22%
Corporate Bonds	37.84%
Floating Rate Loans	1.32%
Foreign Government Obligations	0.14%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.35%
Government Sponsored Enterprises Pass-Throughs	23.60%
Municipal Bonds	0.10%
Non-Agency Commercial Mortgage-Backed Securities	7.35%
U.S. Treasury Obligations	13.57%
Repurchase Agreements	2.02%
Money Market Funds^{Footnote Reference(a)}	0.44%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054895

Shareholder Report [Line Items]

Fund Name

Lord Abbett Total Return Fund

Class Name

Class R2

Trading Symbol

LTRQX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Total Return Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R2	$52	1.04%

Expenses Paid, Amount

$ 52

Expense Ratio, Percent

1.04%

AssetsNet

$ 3,614,608,465

Holdings Count | Holding

543

Advisory Fees Paid, Amount

$ 5,102,298

InvestmentCompanyPortfolioTurnover

212.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,614,608,465
# of Portfolio Holdings	543
Portfolio Turnover Rate	212%
Total Advisory Fees Paid	$5,102,298

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	12.22%
Corporate Bonds	37.84%
Floating Rate Loans	1.32%
Foreign Government Obligations	0.14%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.35%
Government Sponsored Enterprises Pass-Throughs	23.60%
Municipal Bonds	0.10%
Non-Agency Commercial Mortgage-Backed Securities	7.35%
U.S. Treasury Obligations	13.57%
Repurchase Agreements	2.02%
Money Market Funds^{Footnote Reference(a)}	0.44%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000054896

Shareholder Report [Line Items]

Fund Name

Lord Abbett Total Return Fund

Class Name

Class R3

Trading Symbol

LTRRX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Total Return Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R3	$47	0.94%

Expenses Paid, Amount

$ 47

Expense Ratio, Percent

0.94%

AssetsNet

$ 3,614,608,465

Holdings Count | Holding

543

Advisory Fees Paid, Amount

$ 5,102,298

InvestmentCompanyPortfolioTurnover

212.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,614,608,465
# of Portfolio Holdings	543
Portfolio Turnover Rate	212%
Total Advisory Fees Paid	$5,102,298

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	12.22%
Corporate Bonds	37.84%
Floating Rate Loans	1.32%
Foreign Government Obligations	0.14%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.35%
Government Sponsored Enterprises Pass-Throughs	23.60%
Municipal Bonds	0.10%
Non-Agency Commercial Mortgage-Backed Securities	7.35%
U.S. Treasury Obligations	13.57%
Repurchase Agreements	2.02%
Money Market Funds^{Footnote Reference(a)}	0.44%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156629

Shareholder Report [Line Items]

Fund Name

Lord Abbett Total Return Fund

Class Name

Class R4

Trading Symbol

LTRKX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Total Return Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R4	$34	0.69%

Expenses Paid, Amount

$ 34

Expense Ratio, Percent

0.69%

AssetsNet

$ 3,614,608,465

Holdings Count | Holding

543

Advisory Fees Paid, Amount

$ 5,102,298

InvestmentCompanyPortfolioTurnover

212.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,614,608,465
# of Portfolio Holdings	543
Portfolio Turnover Rate	212%
Total Advisory Fees Paid	$5,102,298

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	12.22%
Corporate Bonds	37.84%
Floating Rate Loans	1.32%
Foreign Government Obligations	0.14%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.35%
Government Sponsored Enterprises Pass-Throughs	23.60%
Municipal Bonds	0.10%
Non-Agency Commercial Mortgage-Backed Securities	7.35%
U.S. Treasury Obligations	13.57%
Repurchase Agreements	2.02%
Money Market Funds^{Footnote Reference(a)}	0.44%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156630

Shareholder Report [Line Items]

Fund Name

Lord Abbett Total Return Fund

Class Name

Class R5

Trading Symbol

LTRTX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Total Return Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R5	$22	0.44%

Expenses Paid, Amount

$ 22

Expense Ratio, Percent

0.44%

AssetsNet

$ 3,614,608,465

Holdings Count | Holding

543

Advisory Fees Paid, Amount

$ 5,102,298

InvestmentCompanyPortfolioTurnover

212.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,614,608,465
# of Portfolio Holdings	543
Portfolio Turnover Rate	212%
Total Advisory Fees Paid	$5,102,298

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	12.22%
Corporate Bonds	37.84%
Floating Rate Loans	1.32%
Foreign Government Obligations	0.14%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.35%
Government Sponsored Enterprises Pass-Throughs	23.60%
Municipal Bonds	0.10%
Non-Agency Commercial Mortgage-Backed Securities	7.35%
U.S. Treasury Obligations	13.57%
Repurchase Agreements	2.02%
Money Market Funds^{Footnote Reference(a)}	0.44%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.

C000156631

Shareholder Report [Line Items]

Fund Name

Lord Abbett Total Return Fund

Class Name

Class R6

Trading Symbol

LTRHX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Total Return Fund for the period of December 1, 2024 to May 31, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at lordabbett.com/FundDocuments. You can also request this information by contacting us at 888-522-2388.

Additional Information Phone Number

888-522-2388

Additional Information Website

Expenses [Text Block]

What were the Fund costs for the last period?

(based on a hypothetical $10,000 investment)

Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class R6	$18	0.35%

Expenses Paid, Amount

$ 18

Expense Ratio, Percent

0.35%

AssetsNet

$ 3,614,608,465

Holdings Count | Holding

543

Advisory Fees Paid, Amount

$ 5,102,298

InvestmentCompanyPortfolioTurnover

212.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of May 31, 2025)

Total Net Assets	$3,614,608,465
# of Portfolio Holdings	543
Portfolio Turnover Rate	212%
Total Advisory Fees Paid	$5,102,298

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	12.22%
Corporate Bonds	37.84%
Floating Rate Loans	1.32%
Foreign Government Obligations	0.14%
Government Sponsored Enterprises Collateralized Mortgage Obligations	1.35%
Government Sponsored Enterprises Pass-Throughs	23.60%
Municipal Bonds	0.10%
Non-Agency Commercial Mortgage-Backed Securities	7.35%
U.S. Treasury Obligations	13.57%
Repurchase Agreements	2.02%
Money Market Funds^{Footnote Reference(a)}	0.44%
Time Deposits^{Footnote Reference(a)}	0.05%
Total	100.00%

Footnote	Description
Footnote*	Represents percent of total investments, which excludes derivatives.
Footnote(a)	Securities were purchased with the cash collateral from loaned securities.

Material Fund Change [Text Block]

Summary of Fund Changes

There were no material fund changes during the period.

Summary of Change Legend [Text Block]

There were no material fund changes during the period.