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Risk Return Abstract rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FEDERATED HERMES WORLD INVESTMENT SERIES, INC.
Prospectus Date rr_ProspectusDate Jan. 30, 2022
Federated Hermes International Small-Mid Company Fund  
Risk Return Abstract rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <span style="color:#000000;font-family:Times New Roman;font-size:14pt;">Fund Summary Information </span><span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">Federated Hermes International Small-Mid Company Fund (the “Fund”)</span>
Objective [Heading] rr_ObjectiveHeading <span style="color:#000000;font-family:Arial;font-size:8pt;font-weight:bold;text-transform:uppercase;">RISK/RETURN SUMMARY: INVESTMENT OBJECTIVE</span>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund’s investment objective is to provide long-term growth of capital.
Expense [Heading] rr_ExpenseHeading <span style="color:#000000;font-family:Arial;font-size:8pt;font-weight:bold;text-transform:uppercase;">RISK/RETURN SUMMARY: FEES AND EXPENSES</span>
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy, hold and sell Class A Shares (A), Class C Shares (C) and Institutional Shares (IS) of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes (e.g., A class) of Federated Hermes funds. More information about these and other discounts is available from your financial professional, in the “What Do Shares Cost?” section of the Prospectus on page 17 and in “Appendix B” to this Prospectus.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">Shareholder Fees (fees paid directly from your investment)</span>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)</span>
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination <span style="font-family:Arial;font-size:6.4pt;">February 1, 2023</span>
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">Portfolio Turnover</span>
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund Shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 34% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 34.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts <span style="font-family:Times New Roman;font-size:10pt;"> You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $</span><span style="font-family:Times New Roman;font-size:10pt;">50,000</span><span style="font-family:Times New Roman;font-size:10pt;"> in certain classes (e.g., A class) of Federated Hermes funds.</span>
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading <span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">Example</span>
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.The Example assumes that you invest $10,000 for the time periods indicated and then redeem all of your Shares at the end of those periods. Expenses assuming no redemption are also shown. The Example also assumes that your investment has a 5% return each year and that operating expenses (excluding any sales loads on reinvested dividends, fee waivers and/or expense reimbursements) are as shown in the table above and remain the same. The expenses used to calculate the Fund’s examples do not include fee waivers or expense reimbursements. Although your actual costs and returns may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading <span style="color:#000000;font-family:Arial;font-size:8pt;font-weight:bold;text-transform:uppercase;">RISK/RETURN SUMMARY: INVESTMENTS, RISKS and PERFORMANCE </span><span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">What are the Fund’s Main Investment Strategies?</span>
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund pursues its investment objective of long-term growth of capital by investing at least 80% of its net assets in equity securities issued by non-U.S. small- or mid-capitalization companies. The Fund’s investment adviser, Federated Global Investment Management Corp., (the “Adviser”) seeks to invest in companies whose stock the Adviser perceives as undervalued relative to their assets or attractively priced relative to their growth prospects. The Adviser, in actively managing the Fund’s portfolio, may emphasize business sectors or regions of the world in the Fund’s portfolio because they exhibit enhanced return opportunities. The Fund may invest in companies from both developed and emerging market countries. The Fund may hedge its currency risk by using derivatives such as futures or forward contracts. The Fund may invest in depositary receipts, real estate investment trusts, exchange-traded funds, derivative contracts (such as options, swaps and futures contracts) and hybrid investments (such as notes linked to underlying securities or indices) in order to implement its investment strategy. For example, the Fund may use derivative contracts or hybrid instruments to increase or decrease the portfolio’s exposure to the investment(s) underlying the derivative or hybrid instrument in an attempt to benefit from changes in the value of the underlying investment(s), to obtain premiums from the sale of derivative contracts, or to realize gains from trading a derivative contract. There can be no assurance that the Fund’s use of derivative contracts or hybrid instruments will work as intended. Derivative investments made by the Fund are included within the Fund’s 80% policy, as described below, and are calculated at market value.The Fund will invest its assets so that at least 80% of its net assets (plus any borrowings for investment purposes) are invested in small- or mid-capitalization companies. The Fund will notify shareholders at least 60 days in advance of any change in its investment policy that would permit the Fund to invest, under normal circumstances, less than 80% of its net assets (plus any borrowings for investment purposes) in investments in small- or mid-capitalization companies. For purposes of this limitation, small- or mid-capitalization companies will normally be defined as companies with market capitalizations similar to the constituents of the Fund’s benchmark, the MSCI ACWI ex USA SMID Cap Index. As of November 30, 2021, the capitalization of companies included in the MSCI ACWI ex USA SMID Cap Index ranged from approximately $35.7 million to $38.7 billion. Such definition will be applied at the time of investment and the Adviser will not be required to sell a stock because a company’s market capitalization has grown larger than the range of small- or mid-capitalization stocks in the MSCI ACWI ex USA SMID Cap Index.
Risk [Heading] rr_RiskHeading <span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">What are the Main Risks of Investing in the Fund?</span>
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund. The primary factors that may reduce the Fund’s returns include:■ Stock Market Risk. The value of equity securities in the Fund’s portfolio will fluctuate and, as a result, the Fund’s Share price may decline suddenly or over a sustained period of time. Information publicly available about a company, whether from the company’s financial statements or other disclosures or from third parties, or information available to some but not all market participants, can affect the price of a company’s shares in the market. Among other factors, equity securities may decline in value because of an increase in interest rates or changes in the stock market. Recent and potential future changes in industry and/or economic trends, as well as changes in monetary policy made by central banks and/or their governments, also can affect the level of interest rates and contribute to the development of or increase in volatility, illiquidity, shareholder redemptions and other adverse effects (such as a decline in a company’s stock price), which could negatively impact the Fund’s performance.■ Real Estate Investment Trust Risk. Real estate investment trusts (REITs) carry risks associated with owning real estate, including the potential for a decline in value due to economic or market conditions.■ Risk of Foreign Investing. The foreign markets in which the Fund invests may be subject to economic or political conditions which are less favorable than those of the United States and may lack financial reporting standards or regulatory requirements comparable to those applicable to U.S. companies.■ Risk of Investing in Depositary Receipts and Domestically Traded Securities of Foreign Issuers. Because the Fund may invest in American Depositary Receipts and other domestically traded securities of foreign companies, whether in the United States or in foreign local markets, the Fund’s Share price may be more affected by foreign economic and political conditions, taxation policies and accounting and auditing standards than would otherwise be the case.■ Small-Cap Company Risk. The Fund may invest in small capitalization (or “small-cap”) companies. Small-cap companies may have less liquid stock, a more volatile share price, unproven track records, a limited product or service base, and limited access to capital. The above factors could make small-cap companies more likely to fail than larger companies, and increase the volatility of the Fund’s portfolio, performance and Share price. The Adviser and its affiliated investment advisers also can manage other funds and accounts that use small-cap or similar investment strategies, and investments in small-cap securities by multiple funds and accounts, including those managed by the Adviser and its affiliates, could impact the availability of suitable small-cap securities and cause a capacity constraint associated with the Fund’s small-cap investment strategy.■ Mid-Cap Company Risk. The Fund may invest in mid-capitalization (or “mid-cap”) companies. Mid-cap companies often have narrower markets, limited managerial and financial resources, more volatile performance and greater risk of failure, compared to larger, more established companies. These factors could increase the volatility of the Fund’s portfolio, performance and Share price.■ Currency Risk. Exchange rates for currencies fluctuate daily. Accordingly, the Fund may experience increasedvolatility with respect to the value of its Shares and its returns as a result of its exposure to foreign currencies through direct holding of such currencies or holding of non-U.S. dollar denominated securities.■  European Union and Eurozone Related Risk. A number of countries in the European Union (EU), including certain countries within the EU that have adopted the euro (Eurozone), have experienced, and may continue to experience, severe economic and financial difficulties. Additional countries within the EU may also fall subject to such difficulties. These events could negatively affect the value and liquidity of the Fund’s investments in euro-denominated securities and derivatives contracts, securities of issuers located in the EU or with significant exposure to EU issuers or countries.■ Risk of Investing in Emerging Market Countries. Securities issued or traded in emerging markets generally entail greater risks than securities issued or traded in developed markets. Emerging market countries may have relatively unstable governments and may present the risk of nationalization of businesses, expropriation, confiscatory taxation or, in certain instances, reversion to closed market, centrally planned economies.■ Greater China Risk. Although larger and/or more established than many emerging markets, the markets of the Greater China region function in many ways as emerging markets, and carry the high levels of risks associated with emerging markets. Direct investments in, or indirect exposure to, the Greater China region may be subject to the risks associated with trading on less-developed trading markets, in addition to acute political risks such as possible negative repercussions resulting from China’s relationship with Taiwan or Hong Kong, restrictions on monetary repatriation, or other adverse government actions. As export-driven economies, the economies of countries in the Greater China region are affected by developments in the economies of their principal trading partners.■ Sector Risk. Companies with similar characteristics may be grouped together in broad categories called sectors. Sector risk is the possibility that a certain sector may underperform other sectors or the market as a whole. As the Adviser allocates more of the Fund’s portfolio holdings to a particular sector, the Fund’s performance will be more susceptible to any economic, business or other developments which generally affect that sector.■ Investment Style Risk. The Fund may employ a combination of styles that impact its risk characteristics, such as growth and value investing. Due to the Fund’s style of investing, the Fund’s Share price may lag that of other funds using a different investment style.■ Liquidity Risk. Trading opportunities are more limited for equity securities that are not widely held. This may make it more difficult to sell or buy a security at a favorable price or time. Liquidity risk also refers to the possibility that the Fund may not be able to sell a security or close out a derivative contract when it wants to.■ Custodial Services and Related Investment Costs. Custodial services and other costs relating to investment in international securities markets generally are more expensive due to differing settlement and clearance procedures than those of the United States. The inability of the Fund to make intended securities purchases due to settlement problems could cause the Fund to miss attractive investment opportunities. In addition, security settlement and clearance procedures in some emerging market countries may not fully protect the Fund against loss of its assets.■ Exchange-Traded Funds Risk. An investment in an ETF generally presents the same primary risks as an investment in a conventional fund (i.e., one that is not exchange traded). In addition, ETFs may be subject to the following risks that do not apply to conventional funds: (i) the market price of an ETF’s shares may trade above or below their net asset value; (ii) an active trading market for an ETF’s shares may not develop or be maintained; or (iii) trading of an ETF’s shares may be halted if the listing exchange’s officials deem such action appropriate.■ Risk of Investing in Derivative Contracts and Hybrid Instruments. Derivative contracts and hybrid instruments involve risks different from, or possibly greater than, risks associated with investing directly in securities and other traditional investments. Specific risk issues related to the use of such contracts and instruments include valuation and tax issues, increased potential for losses and/or costs to the Fund, and a potential reduction in gains to the Fund. Each of these issues is described in greater detail in this Prospectus. Derivative contracts and hybrid instruments may also involve other risks described in this Prospectus such as stock market, credit, currency, liquidity and leverage risks.■ Counterparty Credit Risk. Credit risk includes the possibility that a party to a transaction involving the Fund will fail to meet its obligations. This could cause the Fund to lose the benefit of the transaction or prevent the Fund from selling or buying other securities to implement its investment strategy.■ Leverage Risk. Leverage risk is created when an investment, which includes, for example, an investment in a derivative contract, exposes the Fund to a level of risk that exceeds the amount invested. Changes in the value of such an investment magnify the Fund’s risk of loss and potential for gain. Investments can have these same results if their returns are based on a multiple of a specified index, security or other benchmark.■ Risk Related to the Economy. The value of the Fund’s portfolio may decline in tandem with a drop in the overall value of the markets in which the Fund invests and/or other markets. Economic, political and financial conditions, industry or economic trends and developments or public health risks, such as epidemics or pandemics, may, from time to time, and for varying periods of time, cause the Fund to experience volatility, illiquidity, shareholder redemptions, or other potentially adverse effects.■ Initial public offerings risk. IPOs are initial public offerings of equity securities. Securities issued in IPOs have no trading history, and there may only be limited information about the companies. In addition, the prices of securities sold in IPOs may be highly volatile and may rise or fall shortly after an IPO.■ Technology Risk. The Adviser uses various technologies in managing the Fund, consistent with its investment objective(s) and strategy described in this Prospectus. For example, proprietary and third-party data and systems are utilized to support decision making for the Fund. Data imprecision, software or other technology malfunctions, programming inaccuracies and similar circumstances may impair the performance of these systems, which may negatively affect Fund performance.The Shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any bank and are not insured or guaranteed by the U.S. government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Risk Lose Money [Text] rr_RiskLoseMoney <span style="color:#000000;font-family:Times New Roman;font-size:10pt;margin-left:10pt;">All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund.</span>
RIsk Not Insured [Text] rr_RiskNotInsured <span style="color:#000000;font-family:Times New Roman;font-size:10pt;margin-left:10pt;">The Shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">bank and are not insured or guaranteed by the U.S. government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.</span>
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading <span style="color:#000000;font-family:Arial;font-size:8pt;font-weight:bold;text-transform:uppercase;">Performance: Bar Chart and Table </span><span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">Risk/Return Bar Chart</span>
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The bar chart and performance table below reflect historical performance data for the Fund and are intended to help you analyze the Fund’s investment risks in light of its historical returns. The bar chart shows the variability of the Fund’s A class total returns on a calendar year-by-year basis. The Average Annual Total Return table shows returns for each class averaged over the stated periods, and includes comparative performance information. The Fund’s performance will fluctuate, and past performance (before and after taxes) is not necessarily an indication of future results. Updated performance information for the Fund is available under the “Products” section at FederatedInvestors.com or by calling 1-800-341-7400.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns <span style="color:#000000;font-family:Times New Roman;font-size:10pt;margin-left:10pt;">The bar chart and performance table below reflect historical performance data for the Fund and are intended to help you </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">analyze the Fund’s investment risks in light of its historical returns. The bar chart shows the variability of the Fund’s A class total returns on a calendar year-by-year basis.</span>
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone <span style="font-family:Times New Roman;font-size:10pt;">1-800-341-7400</span>
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress <span style="color:#0000FF;font-family:Times New Roman;font-size:10pt;">FederatedInvestors.com</span>
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture <span style="color:#000000;font-family:Times New Roman;font-size:10pt;font-style:italic;">The Fund’s performance will fluctuate, and past performance (before and after taxes) is not necessarily an indication of future results.</span>
Bar Chart [Heading] rr_BarChartHeading Federated Hermes International Small-Mid Company Fund – A Class
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The total returns shown in the bar chart do not reflect the payment of any sales charges or recurring shareholder account fees. If these charges or fees had been included, the returns shown would have been lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The total returns shown in the bar chart do not reflect the payment of any sales charges or recurring shareholder account fees. If these charges or fees had been included, the returns shown would have been lower.Within the periods shown in the bar chart, the Fund’s A class highest quarterly return was 26.92% (quarter ended June 30, 2020). Its lowest quarterly return was (22.04)% (quarter ended March 31, 2020).
Performance Table Heading rr_PerformanceTableHeading <span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">Average Annual Total Return Table</span>
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate <span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> After-tax returns are calculated using a standard set of assumptions. The stated returns assume the highest historical </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;font-weight:bold;">federal</span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> income and capital gains tax rates. These after-tax returns do </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;font-weight:bold;">not</span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> reflect the effect of any applicable </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;font-weight:bold;">state</span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> and </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;font-weight:bold;">local</span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> taxes.</span>
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred <span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> After-tax returns are not relevant to investors holding Shares through tax-deferred programs, such as a 401(k) plan, an Individual Retirement Account (IRA) or other tax-advantaged investment plan.</span>
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown <span style="color:#000000;font-family:Times New Roman;font-size:10pt;">After-tax returns are shown only for A class, and after-tax returns for C and IS classes will differ </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">from those shown for A class.</span>
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock In addition to Return Before Taxes, Return After Taxes is shown for the Fund’s A class to illustrate the effect of federal taxes on Fund returns. After-tax returns are shown only for A class, and after-tax returns for C and IS classes will differ from those shown for A class. Actual after-tax returns depend on each investor’s personal tax situation, and are likely to differ from those shown. After-tax returns are calculated using a standard set of assumptions. The stated returns assume the highest historical federal income and capital gains tax rates. These after-tax returns do not reflect the effect of any applicable state and local taxes. After-tax returns are not relevant to investors holding Shares through tax-deferred programs, such as a 401(k) plan, an Individual Retirement Account (IRA) or other tax-advantaged investment plan.(For the Period Ended December 31, 2021)
Fee Waiver Or Reimbursement Over Assets, Later Of Termination Or Next Effective Prospectus federate_FeeWaiverOrReimbursementOverAssetsLaterOfTerminationOrNextEffectiveProspectus <span style="font-family:Arial;font-size:6.4pt;">up to but not including the later of (the “Termination Date”): (a) </span><span style="font-family:Arial;font-size:6.4pt;">February 1, 2023</span><span style="font-family:Arial;font-size:6.4pt;">; or (b) the date of </span><span style="font-family:Arial;font-size:6.4pt;">the Fund’s next effective Prospectus.</span>
Federated Hermes International Small-Mid Company Fund | A  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption none
Exchange Fee rr_ExchangeFeeOverRedemption none
Management Fee rr_ManagementFeesOverAssets 0.90%
Distribution (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none [1]
Other Expenses rr_OtherExpensesOverAssets 0.65%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.55%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.31%) [2]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.24%
1 Year rr_ExpenseExampleYear01 $ 699
3 Years rr_ExpenseExampleYear03 1,013
5 Years rr_ExpenseExampleYear05 1,348
10 Years rr_ExpenseExampleYear10 2,294
1 Year rr_ExpenseExampleNoRedemptionYear01 699
3 Years rr_ExpenseExampleNoRedemptionYear03 1,013
5 Years rr_ExpenseExampleNoRedemptionYear05 1,348
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,294
2012 rr_AnnualReturn2012 22.01%
2013 rr_AnnualReturn2013 28.08%
2014 rr_AnnualReturn2014 (9.34%)
2015 rr_AnnualReturn2015 9.65%
2016 rr_AnnualReturn2016 (8.31%)
2017 rr_AnnualReturn2017 34.70%
2018 rr_AnnualReturn2018 (18.85%)
2019 rr_AnnualReturn2019 31.75%
2020 rr_AnnualReturn2020 31.19%
2021 rr_AnnualReturn2021 5.96%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 26.92%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.04%)
1 Year rr_AverageAnnualReturnYear01 0.14%
5 Years rr_AverageAnnualReturnYear05 13.60%
10 Years rr_AverageAnnualReturnYear10 10.42%
Federated Hermes International Small-Mid Company Fund | C  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable) rr_MaximumDeferredSalesChargeOverOther 1.00%
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption none
Exchange Fee rr_ExchangeFeeOverRedemption none
Management Fee rr_ManagementFeesOverAssets 0.90%
Distribution (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.75%
Other Expenses rr_OtherExpensesOverAssets 0.65%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.30%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.31%) [2]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.99%
1 Year rr_ExpenseExampleYear01 $ 333
3 Years rr_ExpenseExampleYear03 718
5 Years rr_ExpenseExampleYear05 1,230
10 Years rr_ExpenseExampleYear10 2,448
1 Year rr_ExpenseExampleNoRedemptionYear01 233
3 Years rr_ExpenseExampleNoRedemptionYear03 718
5 Years rr_ExpenseExampleNoRedemptionYear05 1,230
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,448
1 Year rr_AverageAnnualReturnYear01 4.24%
5 Years rr_AverageAnnualReturnYear05 14.00%
10 Years rr_AverageAnnualReturnYear10 10.34%
Federated Hermes International Small-Mid Company Fund | IS  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, as applicable) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) (as a percentage of offering price) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption none
Exchange Fee rr_ExchangeFeeOverRedemption none
Management Fee rr_ManagementFeesOverAssets 0.90%
Distribution (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.40%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.30%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.31%) [2]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 0.99%
1 Year rr_ExpenseExampleYear01 $ 132
3 Years rr_ExpenseExampleYear03 412
5 Years rr_ExpenseExampleYear05 713
10 Years rr_ExpenseExampleYear10 1,568
1 Year rr_ExpenseExampleNoRedemptionYear01 132
3 Years rr_ExpenseExampleNoRedemptionYear03 412
5 Years rr_ExpenseExampleNoRedemptionYear05 713
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,568
1 Year rr_AverageAnnualReturnYear01 6.23%
5 Years rr_AverageAnnualReturnYear05 15.13%
10 Years rr_AverageAnnualReturnYear10 11.28%
Federated Hermes International Small-Mid Company Fund | Return After Taxes on Distributions | A  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (1.76%)
5 Years rr_AverageAnnualReturnYear05 11.62%
10 Years rr_AverageAnnualReturnYear10 8.57%
Federated Hermes International Small-Mid Company Fund | Return After Taxes on Distributions and Sale of Fund Shares | A  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.14%
5 Years rr_AverageAnnualReturnYear05 10.51%
10 Years rr_AverageAnnualReturnYear10 8.08%
Federated Hermes International Small-Mid Company Fund | MSCI ACWI ex USA SMID Cap Index(reflects no deduction for fees, expenses or taxes)  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 10.16% [3]
5 Years rr_AverageAnnualReturnYear05 10.30% [3]
10 Years rr_AverageAnnualReturnYear10 8.63% [3]
Federated Hermes International Small-Mid Company Fund | Morningstar Foreign Small/Mid Growth Average Index(reflects no deduction for fees, expenses or taxes)  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 8.79% [4]
5 Years rr_AverageAnnualReturnYear05 15.08% [4]
10 Years rr_AverageAnnualReturnYear10 11.93% [4]
[1] The Fund has adopted a Distribution (12b-1) Plan for its Class A Shares pursuant to which the A class of the Fund may incur and pay a Distribution (12b-1) Fee of up to a maximum amount of 0.05%. No such fee is currently incurred and paid by the A class of the Fund. The A class of the Fund will not incur and pay such a Distribution (12b-1) Fee until such time as approved by the Fund’s Board of Directors (the “Directors”).
[2] The Adviser and certain of its affiliates on their own initiative have agreed to waive certain amounts of their respective fees and/or reimburse expenses. Total annual fund operating expenses (excluding acquired fund fees and expenses, tax reclaim recovery expenses, interest expense, extraordinary expenses, and proxy-related expenses paid by the Fund, if any) paid by the Fund’s A, C and IS classes (after the voluntary waivers and/or reimbursements) will not exceed 1.23%, 1.98% and 0.98% (the “Fee Limit”), respectively, up to but not including the later of (the “Termination Date”): (a) February 1, 2023; or (b) the date of the Fund’s next effective Prospectus. While the Adviser and its affiliates currently do not anticipate terminating or increasing these arrangements prior to the Termination Date, these arrangements may only be terminated or the Fee Limit increased prior to the Termination Date with the agreement of the Directors.
[3] The MSCI ACWI ex USA SMID Cap Index captures mid- and small-cap representation across developed market countries (excluding the U.S.) and emerging markets countries. The index covers approximately 28% of the free float-adjusted market capitalization in each country.
[4] Morningstar figures represent the average of the total returns reported by all the funds designated by Morningstar as falling into the respective category indicated. They do not reflect sales charges..