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Shareholder Report
 6 Months Ended
May 31, 2024
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Federated Hermes International Series, Inc.
Entity Central Index Key 0000742286
Document Period End Date May 31, 2024
C000024762 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Global Total Return Bond Fund
Class Name Class A Shares
Trading Symbol FTIIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Global Total Return Bond Fund (the “Fund”) for the period of December 1, 2023 to May 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund 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)
Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Class A Shares $51 1.02%
Expenses Paid, Amount $ 51
Expense Ratio, Percent 1.02%
Net Assets $ 16,619,184
Holdings Count | Holding 192
Investment Company Portfolio Turnover 20.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $16,619,184%
Number of Investments $192%
Portfolio Turnover Rate $20%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets)1
Graphical Representation - Allocation 1 Chart
Top Currencies
(% of Net Assets)1
Graphical Representation - Allocation 2 Chart
1   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 total net assets shown in the table will differ from those presented on the Portfolio of Investments.
C000024764 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Global Total Return Bond Fund
Class Name Class C Shares
Trading Symbol FTIBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Global Total Return Bond Fund (the “Fund”) for the period of December 1, 2023 to May 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund 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)
Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Class C Shares $88 1.77%
Expenses Paid, Amount $ 88
Expense Ratio, Percent 1.77%
Net Assets $ 16,619,184
Holdings Count | Holding 192
Investment Company Portfolio Turnover 20.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $16,619,184%
Number of Investments $192%
Portfolio Turnover Rate $20%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets)1
Graphical Representation - Allocation 1 Chart
Top Currencies
(% of Net Assets)1
Graphical Representation - Allocation 2 Chart
1   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 total net assets shown in the table will differ from those presented on the Portfolio of Investments.
C000176365 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Global Total Return Bond Fund
Class Name Institutional Shares
Trading Symbol FGTBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Global Total Return Bond Fund (the “Fund”) for the period of December 1, 2023 to May 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund 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)
Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Institutional Shares $39 0.77%
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.77%
Net Assets $ 16,619,184
Holdings Count | Holding 192
Investment Company Portfolio Turnover 20.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $16,619,184%
Number of Investments $192%
Portfolio Turnover Rate $20%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets)1
Graphical Representation - Allocation 1 Chart
Top Currencies
(% of Net Assets)1
Graphical Representation - Allocation 2 Chart
1   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 total net assets shown in the table will differ from those presented on the Portfolio of Investments.