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Shareholder Report
 6 Months Ended
May 31, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Federated Hermes Fixed Income Securities, Inc.
Entity Central Index Key 0000879569
Entity Investment Company Type N-1A
Document Period End Date May 31, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
C000026757  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Strategic Income Fund
Class Name Class A Shares
Trading Symbol STIAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Strategic Income Fund (the "Fund") for the period of December 1, 2025 to May 31, 2026.
Additional Information [Text Block] You can find additional information at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1-800-341-7400, Option 4, or your financial advisor.
Additional Information Phone Number 1-800-341-7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as an annualized percentage of a $10,000 investment
Class A Shares
$47
0.93%
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.93%
AssetsNet $ 573,360,565
Holdings Count | Holding 293
InvestmentCompanyPortfolioTurnover 39.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$573,360,565
  • Number of Investments293
  • Portfolio Turnover39%
Holdings [Text Block]

Top Security Types (% of Net Assets)Footnote Reference*

Group By Sector Chart
Table Summary
Value
Value
Common Stocks
0.4%
Commerical Mortgage-Backed Securities
0.8%
Asset-Backed Securities
1.0%
Cash Equivalents
3.4%
Collaterized Mortgage Obligations
5.0%
Project and Trade Finance Core Fund
5.1%
U.S. Treasuries
11.5%
Foreign Governments/Agencies
11.7%
Mortgage Backed Securities
16.5%
Corporate Debt Securities
44.7%
FootnoteDescription
Footnote*
Reflects the pro rata portfolio composition of underlying affiliated investment companies (other than an affiliated money market mutual fund) in which the Fund invested greater than 10% of its net assets as of the date specified above. Accordingly, the percentages of net assets shown in the table will differ from those presented on the Portfolio of Investments.
Material Fund Change [Text Block]
C000026759  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Strategic Income Fund
Class Name Class C Shares
Trading Symbol SINCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Strategic Income Fund (the "Fund") for the period of December 1, 2025 to May 31, 2026.
Additional Information [Text Block] You can find additional information at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1-800-341-7400, Option 4, or your financial advisor.
Additional Information Phone Number 1-800-341-7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as an annualized percentage of a $10,000 investment
Class C Shares
$85
1.69%
Expenses Paid, Amount $ 85
Expense Ratio, Percent 1.69%
AssetsNet $ 573,360,565
Holdings Count | Holding 293
InvestmentCompanyPortfolioTurnover 39.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$573,360,565
  • Number of Investments293
  • Portfolio Turnover39%
Holdings [Text Block]

Top Security Types (% of Net Assets)Footnote Reference*

Group By Sector Chart
Table Summary
Value
Value
Common Stocks
0.4%
Commerical Mortgage-Backed Securities
0.8%
Asset-Backed Securities
1.0%
Cash Equivalents
3.4%
Collaterized Mortgage Obligations
5.0%
Project and Trade Finance Core Fund
5.1%
U.S. Treasuries
11.5%
Foreign Governments/Agencies
11.7%
Mortgage Backed Securities
16.5%
Corporate Debt Securities
44.7%
FootnoteDescription
Footnote*
Reflects the pro rata portfolio composition of underlying affiliated investment companies (other than an affiliated money market mutual fund) in which the Fund invested greater than 10% of its net assets as of the date specified above. Accordingly, the percentages of net assets shown in the table will differ from those presented on the Portfolio of Investments.
Material Fund Change [Text Block]
C000026760  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Strategic Income Fund
Class Name Class F Shares
Trading Symbol STFSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Strategic Income Fund (the "Fund") for the period of December 1, 2025 to May 31, 2026.
Additional Information [Text Block] You can find additional information at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1-800-341-7400, Option 4, or your financial advisor.
Additional Information Phone Number 1-800-341-7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as an annualized percentage of a $10,000 investment
Class F Shares
$47
0.93%
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.93%
AssetsNet $ 573,360,565
Holdings Count | Holding 293
InvestmentCompanyPortfolioTurnover 39.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$573,360,565
  • Number of Investments293
  • Portfolio Turnover39%
Holdings [Text Block]

Top Security Types (% of Net Assets)Footnote Reference*

Group By Sector Chart
Table Summary
Value
Value
Common Stocks
0.4%
Commerical Mortgage-Backed Securities
0.8%
Asset-Backed Securities
1.0%
Cash Equivalents
3.4%
Collaterized Mortgage Obligations
5.0%
Project and Trade Finance Core Fund
5.1%
U.S. Treasuries
11.5%
Foreign Governments/Agencies
11.7%
Mortgage Backed Securities
16.5%
Corporate Debt Securities
44.7%
FootnoteDescription
Footnote*
Reflects the pro rata portfolio composition of underlying affiliated investment companies (other than an affiliated money market mutual fund) in which the Fund invested greater than 10% of its net assets as of the date specified above. Accordingly, the percentages of net assets shown in the table will differ from those presented on the Portfolio of Investments.
Material Fund Change [Text Block]
C000062222  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Strategic Income Fund
Class Name Institutional Shares
Trading Symbol STISX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Strategic Income Fund (the "Fund") for the period of December 1, 2025 to May 31, 2026.
Additional Information [Text Block] You can find additional information at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1-800-341-7400, Option 4, or your financial advisor.
Additional Information Phone Number 1-800-341-7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as an annualized percentage of a $10,000 investment
Institutional Shares
$31
0.61%
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.61%
AssetsNet $ 573,360,565
Holdings Count | Holding 293
InvestmentCompanyPortfolioTurnover 39.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$573,360,565
  • Number of Investments293
  • Portfolio Turnover39%
Holdings [Text Block]

Top Security Types (% of Net Assets)Footnote Reference*

Group By Sector Chart
Table Summary
Value
Value
Common Stocks
0.4%
Commerical Mortgage-Backed Securities
0.8%
Asset-Backed Securities
1.0%
Cash Equivalents
3.4%
Collaterized Mortgage Obligations
5.0%
Project and Trade Finance Core Fund
5.1%
U.S. Treasuries
11.5%
Foreign Governments/Agencies
11.7%
Mortgage Backed Securities
16.5%
Corporate Debt Securities
44.7%
FootnoteDescription
Footnote*
Reflects the pro rata portfolio composition of underlying affiliated investment companies (other than an affiliated money market mutual fund) in which the Fund invested greater than 10% of its net assets as of the date specified above. Accordingly, the percentages of net assets shown in the table will differ from those presented on the Portfolio of Investments.
Material Fund Change [Text Block]
C000177003  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Strategic Income Fund
Class Name Class R6 Shares
Trading Symbol STILX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Strategic Income Fund (the "Fund") for the period of December 1, 2025 to May 31, 2026.
Additional Information [Text Block] You can find additional information at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1-800-341-7400, Option 4, or your financial advisor.
Additional Information Phone Number 1-800-341-7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as an annualized percentage of a $10,000 investment
Class R6 Shares
$30
0.60%
Expenses Paid, Amount $ 30
Expense Ratio, Percent 0.60%
AssetsNet $ 573,360,565
Holdings Count | Holding 293
InvestmentCompanyPortfolioTurnover 39.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$573,360,565
  • Number of Investments293
  • Portfolio Turnover39%
Holdings [Text Block]

Top Security Types (% of Net Assets)Footnote Reference*

Group By Sector Chart
Table Summary
Value
Value
Common Stocks
0.4%
Commerical Mortgage-Backed Securities
0.8%
Asset-Backed Securities
1.0%
Cash Equivalents
3.4%
Collaterized Mortgage Obligations
5.0%
Project and Trade Finance Core Fund
5.1%
U.S. Treasuries
11.5%
Foreign Governments/Agencies
11.7%
Mortgage Backed Securities
16.5%
Corporate Debt Securities
44.7%
FootnoteDescription
Footnote*
Reflects the pro rata portfolio composition of underlying affiliated investment companies (other than an affiliated money market mutual fund) in which the Fund invested greater than 10% of its net assets as of the date specified above. Accordingly, the percentages of net assets shown in the table will differ from those presented on the Portfolio of Investments.
Material Fund Change [Text Block]