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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 World Investment Series, Inc.
Entity Central Index Key 0000918199
Entity Investment Company Type N-1A
Document Period End Date May 31, 2026
C000114967 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Emerging Market Debt Fund
Class Name Institutional Shares
Trading Symbol EMDIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Emerging Market Debt Fund (the “Fund”) for the period of December 1, 2025 to May 31, 2026.
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 an annualized percentage of a $10,000 investment
Institutional Shares $48 0.94%
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.94%
Net Assets $ 27,079,317
Holdings Count | Holding 199
Investment Company Portfolio Turnover 51.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $27,079,317
Number of Investments 199
Portfolio Turnover 51%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
C000024819 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Emerging Market Debt Fund
Class Name Class C Shares
Trading Symbol IHICX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Emerging Market Debt Fund (the “Fund”) for the period of December 1, 2025 to May 31, 2026.
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 an annualized percentage of a $10,000 investment
Class C Shares $99 1.94%
Expenses Paid, Amount $ 99
Expense Ratio, Percent 1.94%
Net Assets $ 27,079,317
Holdings Count | Holding 199
Investment Company Portfolio Turnover 51.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $27,079,317
Number of Investments 199
Portfolio Turnover 51%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
C000024817 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Emerging Market Debt Fund
Class Name Class A Shares
Trading Symbol IHIAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Emerging Market Debt Fund (the “Fund”) for the period of December 1, 2025 to May 31, 2026.
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 an annualized percentage of a $10,000 investment
Class A Shares $61 1.19%
Expenses Paid, Amount $ 61
Expense Ratio, Percent 1.19%
Net Assets $ 27,079,317
Holdings Count | Holding 199
Investment Company Portfolio Turnover 51.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $27,079,317
Number of Investments 199
Portfolio Turnover 51%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
C000024820 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes International Small-Mid Company Fund
Class Name Class A Shares
Trading Symbol ISCAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes International Small-Mid Company Fund (the “Fund”) for the period of December 1, 2025 to May 31, 2026.
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 an annualized percentage of a $10,000 investment
Class A Shares $65 1.21%
Expenses Paid, Amount $ 65
Expense Ratio, Percent 1.21%
Net Assets $ 565,921,496
Holdings Count | Holding 157
Investment Company Portfolio Turnover 21.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $565,921,496
Number of Investments 157
Portfolio Turnover 21%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 2 Chart
C000024822 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes International Small-Mid Company Fund
Class Name Class C Shares
Trading Symbol ISCCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes International Small-Mid Company Fund (the “Fund”) for the period of December 1, 2025 to May 31, 2026.
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 an annualized percentage of a $10,000 investment
Class C Shares $106 1.98%
Expenses Paid, Amount $ 106
Expense Ratio, Percent 1.98%
Net Assets $ 565,921,496
Holdings Count | Holding 157
Investment Company Portfolio Turnover 21.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $565,921,496
Number of Investments 157
Portfolio Turnover 21%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 2 Chart
C000062082 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes International Small-Mid Company Fund
Class Name Institutional Shares
Trading Symbol ISCIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes International Small-Mid Company Fund (the “Fund”) for the period of December 1, 2025 to May 31, 2026.
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 an annualized percentage of a $10,000 investment
Institutional Shares $53 0.98%
Expenses Paid, Amount $ 53
Expense Ratio, Percent 0.98%
Net Assets $ 565,921,496
Holdings Count | Holding 157
Investment Company Portfolio Turnover 21.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $565,921,496
Number of Investments 157
Portfolio Turnover 21%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 2 Chart
C000129977 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes International Leaders Fund
Class Name Class R6 Shares
Trading Symbol FGRSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes International Leaders Fund (the “Fund”) for the period of December 1, 2025 to May 31, 2026.
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 an annualized percentage of a $10,000 investment
Class R6 Shares $39 0.74%
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.74%
Net Assets $ 1,532,444,546
Holdings Count | Holding 83
Investment Company Portfolio Turnover 43.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $1,532,444,546
Number of Investments 83
Portfolio Turnover 43%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 2 Chart
C000090240 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes International Leaders Fund
Class Name Institutional Shares
Trading Symbol FGFLX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes International Leaders Fund (the “Fund”) for the period of December 1, 2025 to May 31, 2026.
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 an annualized percentage of a $10,000 investment
Institutional Shares $41 0.79%
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.79%
Net Assets $ 1,532,444,546
Holdings Count | Holding 83
Investment Company Portfolio Turnover 43.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $1,532,444,546
Number of Investments 83
Portfolio Turnover 43%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 2 Chart
C000130407 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes International Leaders Fund
Class Name Class R Shares
Trading Symbol FGFRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes International Leaders Fund (the “Fund”) for the period of December 1, 2025 to May 31, 2026.
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 an annualized percentage of a $10,000 investment
Class R Shares $64 1.23%
Expenses Paid, Amount $ 64
Expense Ratio, Percent 1.23%
Net Assets $ 1,532,444,546
Holdings Count | Holding 83
Investment Company Portfolio Turnover 43.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $1,532,444,546
Number of Investments 83
Portfolio Turnover 43%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 2 Chart
C000024825 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes International Leaders Fund
Class Name Class C Shares
Trading Symbol FGFCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes International Leaders Fund (the “Fund”) for the period of December 1, 2025 to May 31, 2026.
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 an annualized percentage of a $10,000 investment
Class C Shares $96 1.84%
Expenses Paid, Amount $ 96
Expense Ratio, Percent 1.84%
Net Assets $ 1,532,444,546
Holdings Count | Holding 83
Investment Company Portfolio Turnover 43.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $1,532,444,546
Number of Investments 83
Portfolio Turnover 43%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 2 Chart
C000024823 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes International Leaders Fund
Class Name Class A Shares
Trading Symbol FGFAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes International Leaders Fund (the “Fund”) for the period of December 1, 2025 to May 31, 2026.
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 an annualized percentage of a $10,000 investment
Class A Shares $56 1.07%
Expenses Paid, Amount $ 56
Expense Ratio, Percent 1.07%
Net Assets $ 1,532,444,546
Holdings Count | Holding 83
Investment Company Portfolio Turnover 43.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $1,532,444,546
Number of Investments 83
Portfolio Turnover 43%
Holdings [Text Block]
Fund Holdings
Top Countries
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 2 Chart