This semi-annual shareholder report contains important information about the Lord Abbett Bond Debenture Fund for the period of January 1, 2025 to June 30, 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	$40	0.79%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized.

Expenses Paid, Amount

$ 40

Expense Ratio, Percent

0.79%

^[1]

AssetsNet

$ 21,548,813,834

Holdings Count | Holding

866

InvestmentCompanyPortfolioTurnover

156.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of June 30, 2025)

Total Net Assets	$21,548,813,834
# of Portfolio Holdings	866
Portfolio Turnover Rate	156%

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	1.66%
Common Stocks	4.17%
Corporate Bonds	66.78%
Floating Rate Loans	2.30%
Foreign Government Obligations	4.93%
Government Sponsored Enterprises Pass-Throughs	11.33%
Investments in Underlying Funds	0.91%
Municipal Bonds	0.20%
Non-Agency Commercial Mortgage-Backed Securities	5.14%
Preferred Stocks	0.05%
U.S. Treasury Obligations	1.18%
Repurchase Agreements	0.21%
Money Market Funds^{Footnote Reference(a)}	1.03%
Time Deposits^{Footnote Reference(a)}	0.11%
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.

C000018456

Shareholder Report [Line Items]

Fund Name

Lord Abbett Bond Debenture Fund

Class Name

Class C

Trading Symbol

BDLAX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Bond Debenture Fund for the period of January 1, 2025 to June 30, 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	$71	1.41%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized.

Expenses Paid, Amount

$ 71

Expense Ratio, Percent

1.41%

^[2]

AssetsNet

$ 21,548,813,834

Holdings Count | Holding

866

InvestmentCompanyPortfolioTurnover

156.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of June 30, 2025)

Total Net Assets	$21,548,813,834
# of Portfolio Holdings	866
Portfolio Turnover Rate	156%

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	1.66%
Common Stocks	4.17%
Corporate Bonds	66.78%
Floating Rate Loans	2.30%
Foreign Government Obligations	4.93%
Government Sponsored Enterprises Pass-Throughs	11.33%
Investments in Underlying Funds	0.91%
Municipal Bonds	0.20%
Non-Agency Commercial Mortgage-Backed Securities	5.14%
Preferred Stocks	0.05%
U.S. Treasury Obligations	1.18%
Repurchase Agreements	0.21%
Money Market Funds^{Footnote Reference(a)}	1.03%
Time Deposits^{Footnote Reference(a)}	0.11%
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.

C000052177

Shareholder Report [Line Items]

Fund Name

Lord Abbett Bond Debenture Fund

Class Name

Class F

Trading Symbol

LBDFX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Bond Debenture Fund for the period of January 1, 2025 to June 30, 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	0.69%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized.

Expenses Paid, Amount

$ 35

Expense Ratio, Percent

0.69%

^[3]

AssetsNet

$ 21,548,813,834

Holdings Count | Holding

866

InvestmentCompanyPortfolioTurnover

156.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of June 30, 2025)

Total Net Assets	$21,548,813,834
# of Portfolio Holdings	866
Portfolio Turnover Rate	156%

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	1.66%
Common Stocks	4.17%
Corporate Bonds	66.78%
Floating Rate Loans	2.30%
Foreign Government Obligations	4.93%
Government Sponsored Enterprises Pass-Throughs	11.33%
Investments in Underlying Funds	0.91%
Municipal Bonds	0.20%
Non-Agency Commercial Mortgage-Backed Securities	5.14%
Preferred Stocks	0.05%
U.S. Treasury Obligations	1.18%
Repurchase Agreements	0.21%
Money Market Funds^{Footnote Reference(a)}	1.03%
Time Deposits^{Footnote Reference(a)}	0.11%
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.

C000188230

Shareholder Report [Line Items]

Fund Name

Lord Abbett Bond Debenture Fund

Class Name

Class F3

Trading Symbol

LBNOX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Bond Debenture Fund for the period of January 1, 2025 to June 30, 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	$25	0.49%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized.

Expenses Paid, Amount

$ 25

Expense Ratio, Percent

0.49%

^[4]

AssetsNet

$ 21,548,813,834

Holdings Count | Holding

866

InvestmentCompanyPortfolioTurnover

156.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of June 30, 2025)

Total Net Assets	$21,548,813,834
# of Portfolio Holdings	866
Portfolio Turnover Rate	156%

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	1.66%
Common Stocks	4.17%
Corporate Bonds	66.78%
Floating Rate Loans	2.30%
Foreign Government Obligations	4.93%
Government Sponsored Enterprises Pass-Throughs	11.33%
Investments in Underlying Funds	0.91%
Municipal Bonds	0.20%
Non-Agency Commercial Mortgage-Backed Securities	5.14%
Preferred Stocks	0.05%
U.S. Treasury Obligations	1.18%
Repurchase Agreements	0.21%
Money Market Funds^{Footnote Reference(a)}	1.03%
Time Deposits^{Footnote Reference(a)}	0.11%
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.

C000018458

Shareholder Report [Line Items]

Fund Name

Lord Abbett Bond Debenture Fund

Class Name

Class I

Trading Symbol

LBNYX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Bond Debenture Fund for the period of January 1, 2025 to June 30, 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	0.59%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized.

Expenses Paid, Amount

$ 30

Expense Ratio, Percent

0.59%

^[5]

AssetsNet

$ 21,548,813,834

Holdings Count | Holding

866

InvestmentCompanyPortfolioTurnover

156.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of June 30, 2025)

Total Net Assets	$21,548,813,834
# of Portfolio Holdings	866
Portfolio Turnover Rate	156%

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	1.66%
Common Stocks	4.17%
Corporate Bonds	66.78%
Floating Rate Loans	2.30%
Foreign Government Obligations	4.93%
Government Sponsored Enterprises Pass-Throughs	11.33%
Investments in Underlying Funds	0.91%
Municipal Bonds	0.20%
Non-Agency Commercial Mortgage-Backed Securities	5.14%
Preferred Stocks	0.05%
U.S. Treasury Obligations	1.18%
Repurchase Agreements	0.21%
Money Market Funds^{Footnote Reference(a)}	1.03%
Time Deposits^{Footnote Reference(a)}	0.11%
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.

C000018457

Shareholder Report [Line Items]

Fund Name

Lord Abbett Bond Debenture Fund

Class Name

Class P

Trading Symbol

LBNPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Bond Debenture Fund for the period of January 1, 2025 to June 30, 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	$53	1.04%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized.

Expenses Paid, Amount

$ 53

Expense Ratio, Percent

1.04%

^[6]

AssetsNet

$ 21,548,813,834

Holdings Count | Holding

866

InvestmentCompanyPortfolioTurnover

156.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of June 30, 2025)

Total Net Assets	$21,548,813,834
# of Portfolio Holdings	866
Portfolio Turnover Rate	156%

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	1.66%
Common Stocks	4.17%
Corporate Bonds	66.78%
Floating Rate Loans	2.30%
Foreign Government Obligations	4.93%
Government Sponsored Enterprises Pass-Throughs	11.33%
Investments in Underlying Funds	0.91%
Municipal Bonds	0.20%
Non-Agency Commercial Mortgage-Backed Securities	5.14%
Preferred Stocks	0.05%
U.S. Treasury Obligations	1.18%
Repurchase Agreements	0.21%
Money Market Funds^{Footnote Reference(a)}	1.03%
Time Deposits^{Footnote Reference(a)}	0.11%
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.

C000052178

Shareholder Report [Line Items]

Fund Name

Lord Abbett Bond Debenture Fund

Class Name

Class R2

Trading Symbol

LBNQX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Bond Debenture Fund for the period of January 1, 2025 to June 30, 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	$60	1.19%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized.

Expenses Paid, Amount

$ 60

Expense Ratio, Percent

1.19%

^[7]

AssetsNet

$ 21,548,813,834

Holdings Count | Holding

866

InvestmentCompanyPortfolioTurnover

156.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of June 30, 2025)

Total Net Assets	$21,548,813,834
# of Portfolio Holdings	866
Portfolio Turnover Rate	156%

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	1.66%
Common Stocks	4.17%
Corporate Bonds	66.78%
Floating Rate Loans	2.30%
Foreign Government Obligations	4.93%
Government Sponsored Enterprises Pass-Throughs	11.33%
Investments in Underlying Funds	0.91%
Municipal Bonds	0.20%
Non-Agency Commercial Mortgage-Backed Securities	5.14%
Preferred Stocks	0.05%
U.S. Treasury Obligations	1.18%
Repurchase Agreements	0.21%
Money Market Funds^{Footnote Reference(a)}	1.03%
Time Deposits^{Footnote Reference(a)}	0.11%
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.

C000052179

Shareholder Report [Line Items]

Fund Name

Lord Abbett Bond Debenture Fund

Class Name

Class R3

Trading Symbol

LBNRX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Bond Debenture Fund for the period of January 1, 2025 to June 30, 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	1.09%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized.

Expenses Paid, Amount

$ 55

Expense Ratio, Percent

1.09%

^[8]

AssetsNet

$ 21,548,813,834

Holdings Count | Holding

866

InvestmentCompanyPortfolioTurnover

156.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of June 30, 2025)

Total Net Assets	$21,548,813,834
# of Portfolio Holdings	866
Portfolio Turnover Rate	156%

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	1.66%
Common Stocks	4.17%
Corporate Bonds	66.78%
Floating Rate Loans	2.30%
Foreign Government Obligations	4.93%
Government Sponsored Enterprises Pass-Throughs	11.33%
Investments in Underlying Funds	0.91%
Municipal Bonds	0.20%
Non-Agency Commercial Mortgage-Backed Securities	5.14%
Preferred Stocks	0.05%
U.S. Treasury Obligations	1.18%
Repurchase Agreements	0.21%
Money Market Funds^{Footnote Reference(a)}	1.03%
Time Deposits^{Footnote Reference(a)}	0.11%
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.

C000158205

Shareholder Report [Line Items]

Fund Name

Lord Abbett Bond Debenture Fund

Class Name

Class R4

Trading Symbol

LBNSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Bond Debenture Fund for the period of January 1, 2025 to June 30, 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	$42	0.84%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized.

Expenses Paid, Amount

$ 42

Expense Ratio, Percent

0.84%

^[9]

AssetsNet

$ 21,548,813,834

Holdings Count | Holding

866

InvestmentCompanyPortfolioTurnover

156.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of June 30, 2025)

Total Net Assets	$21,548,813,834
# of Portfolio Holdings	866
Portfolio Turnover Rate	156%

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	1.66%
Common Stocks	4.17%
Corporate Bonds	66.78%
Floating Rate Loans	2.30%
Foreign Government Obligations	4.93%
Government Sponsored Enterprises Pass-Throughs	11.33%
Investments in Underlying Funds	0.91%
Municipal Bonds	0.20%
Non-Agency Commercial Mortgage-Backed Securities	5.14%
Preferred Stocks	0.05%
U.S. Treasury Obligations	1.18%
Repurchase Agreements	0.21%
Money Market Funds^{Footnote Reference(a)}	1.03%
Time Deposits^{Footnote Reference(a)}	0.11%
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.

C000158206

Shareholder Report [Line Items]

Fund Name

Lord Abbett Bond Debenture Fund

Class Name

Class R5

Trading Symbol

LBNTX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Bond Debenture Fund for the period of January 1, 2025 to June 30, 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	0.59%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized.

Expenses Paid, Amount

$ 30

Expense Ratio, Percent

0.59%

^[10]

AssetsNet

$ 21,548,813,834

Holdings Count | Holding

866

InvestmentCompanyPortfolioTurnover

156.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of June 30, 2025)

Total Net Assets	$21,548,813,834
# of Portfolio Holdings	866
Portfolio Turnover Rate	156%

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	1.66%
Common Stocks	4.17%
Corporate Bonds	66.78%
Floating Rate Loans	2.30%
Foreign Government Obligations	4.93%
Government Sponsored Enterprises Pass-Throughs	11.33%
Investments in Underlying Funds	0.91%
Municipal Bonds	0.20%
Non-Agency Commercial Mortgage-Backed Securities	5.14%
Preferred Stocks	0.05%
U.S. Treasury Obligations	1.18%
Repurchase Agreements	0.21%
Money Market Funds^{Footnote Reference(a)}	1.03%
Time Deposits^{Footnote Reference(a)}	0.11%
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.

C000158207

Shareholder Report [Line Items]

Fund Name

Lord Abbett Bond Debenture Fund

Class Name

Class R6

Trading Symbol

LBNVX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the Lord Abbett Bond Debenture Fund for the period of January 1, 2025 to June 30, 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	$25	0.49%^{Footnote Reference(a)}

Footnote	Description
Footnote^(a)	Annualized.

Expenses Paid, Amount

$ 25

Expense Ratio, Percent

0.49%

^[11]

AssetsNet

$ 21,548,813,834

Holdings Count | Holding

866

InvestmentCompanyPortfolioTurnover

156.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

(as of June 30, 2025)

Total Net Assets	$21,548,813,834
# of Portfolio Holdings	866
Portfolio Turnover Rate	156%

Holdings [Text Block]

Portfolio Holdings Presented by Portfolio Allocation	%^{Footnote Reference*}
Asset-Backed Securities	1.66%
Common Stocks	4.17%
Corporate Bonds	66.78%
Floating Rate Loans	2.30%
Foreign Government Obligations	4.93%
Government Sponsored Enterprises Pass-Throughs	11.33%
Investments in Underlying Funds	0.91%
Municipal Bonds	0.20%
Non-Agency Commercial Mortgage-Backed Securities	5.14%
Preferred Stocks	0.05%
U.S. Treasury Obligations	1.18%
Repurchase Agreements	0.21%
Money Market Funds^{Footnote Reference(a)}	1.03%
Time Deposits^{Footnote Reference(a)}	0.11%
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.

[1]	Annualized.
[2]	Annualized.
[3]	Annualized.
[4]	Annualized.
[5]	Annualized.
[6]	Annualized.
[7]	Annualized.
[8]	Annualized.
[9]	Annualized.
[10]	Annualized.
[11]	Annualized.