Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Prospectus Date	rr_ProspectusDate	Jan. 31, 2021
Federated Hermes Emerging Market Debt Fund
Risk Return Abstract	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	<span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">Federated Hermes Emerging Market Debt Fund (the “Fund”)</span>
Objective [Heading]	rr_ObjectiveHeading	<span style="color:#000000;font-family:Arial;font-size:8pt;font-weight:bold;margin-left:0%;text-transform:uppercase;">RISK/RETURN SUMMARY: INVESTMENT OBJECTIVE</span>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund’s investment objective is to seek a high level of current income.
Objective, Secondary [Text Block]	rr_ObjectiveSecondaryTextBlock	The Fund has a secondary objective of capital appreciation.
Expense [Heading]	rr_ExpenseHeading	<span style="color:#000000;font-family:Arial;font-size:8pt;font-weight:bold;margin-left:0%;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 qualify for certain sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in 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 19 and in “Appendix B” to this Prospectus. If you purchase the Fund’s IS shares through a broker acting as an agent on behalf of its customers, you may be required to pay a commission to such broker; such commissions, if any, are not reflected in the Example below.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	<span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;margin-left:0%;">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="color:#000000;font-family:Arial;font-size:6.4pt;">February 1, 2022</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 69% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	69.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	<span style="color:#000000;font-family:Times New Roman;font-size:10pt;">You may qualify for certain sales charge discounts if you and your </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">family invest, or agree to invest in the future, at least $</span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">100,000</span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> in A class of Federated Hermes funds.</span>
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 100,000
Expense Example [Heading]	rr_ExpenseExampleHeading	<span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;margin-left:0%;">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 the 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. 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;margin-left:0%;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;margin-left:0%;">What are the Fund’s Main Investment Strategies?</span>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund invests primarily in a portfolio of emerging market fixed-income investments. The Fund’s investments may be denominated in foreign currencies or U.S. dollars, and may be of any duration. The Fund may invest in non-investment grade debt investments, which may offer higher yields than investment-grade debt investments. Investors in lower-rated foreign debt investments may receive higher yields as compensation for assuming higher credit risks. The Fund does not limit the amount it may invest in investments rated below investment-grade. The Fund may invest in derivative contracts to implement its investment strategies, as more fully described herein. When the Fund’s investment adviser (the “Adviser”) considers the risk/return prospects of emerging market equity securities to be attractive, the Fund may also opportunistically invest in equity securities or pooled vehicles such as exchange-traded funds (ETFs) or other investment companies in order to gain exposure to a specific region, country, or market sector or for other reasons consistent with its investment strategy. The Adviser actively manages the Fund’s portfolio seeking total returns over longer periods in excess of the Fund’s broad based securities market index, the JP Morgan Emerging Markets Bond Index Global (EMBIG) and a blended supplemental index (as described in the Average Annual Total Return Table below). The EMBIG covers emerging market countries in the following regions: Americas, Europe, Asia, Middle East and Africa. The performance of the Fund, as an actively managed portfolio, should be evaluated against the EMBIG and the blended supplemental index over longer periods of time. Consistent with the Fund’s benchmark, the Fund may, from time to time, have larger allocations or make significant investments in issuers located or doing business in a single country. Volatility in emerging markets means that even small differences in time periods for comparison can have a substantial impact on returns. The Fund has no duration target or parameters with respect to its average portfolio duration. Rather, the Adviser may lengthen or shorten average portfolio duration in response to changing market conditions. These duration adjustments can be made either by buying or selling portfolio investments or through the use of derivative contracts.The investment process entails a thorough assessment of the global macroeconomic environment and determines the most relevant investment themes that drive emerging markets. These investment themes can be either secular or cyclical in nature and are intended to define guiding principles which permeate through the various stages of the investment process from country and sector to individual corporate issuers. In selecting investments, the Adviser gives emphasis to the underlying quality of issuers domiciled in emerging market countries. The Adviser performs intensive credit analysis of both sovereign and corporate debt issues. Secondarily, the Adviser considers the extent to which market interest rates may impact the potential investment return of emerging markets debt investments.While the Adviser may use derivatives to limit the negative effect on the Fund’s investment returns inclusive of those losses that may be incurred due to anticipated changes in the relative values of selected currencies in the portfolio, the Adviser will not attempt to fully insulate the Fund’s investment returns from the influence of currency fluctuations on portfolio investments denominated in foreign currencies. 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 emerging market fixed-income investments. The Fund will notify shareholders at least 60 days in advance of any change in its investment policy that would enable the Fund to invest, under normal circumstances, less than 80% of its net assets in emerging market fixed-income investments. The Fund is a non-diversified portfolio of Federated Hermes World Investment Series, Inc.PORTFOLIO TURNOVERThe Fund actively trades its portfolio securities in an attempt to achieve its investment objective. Active trading will cause the Fund to have an increased portfolio turnover rate and increase the Fund’s trading costs, which may have an adverse impact on the Fund’s performance. An active trading strategy will likely result in the Fund generating more short-term capital gains or losses. Short-term gains are generally taxed at a higher rate than long-term gains. Any short-term losses are used first to offset short-term gains.
Risk [Heading]	rr_RiskHeading	<span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;margin-left:0%;">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:■  Issuer Credit Risk. It is possible that interest or principal on securities will not be paid when due. Such non-payment or default may reduce the value of the Fund’s portfolio holdings, its share price and its performance.■  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 money or to lose the benefit of the transaction or prevent the Fund from selling or buying other securities to implement its investment strategy.■  Risk Associated with Non-Investment Grade Securities. Securities rated below investment grade generally are subject to greater interest rate, credit and liquidity risks than investment-grade securities. These securities are considered speculative with respect to the issuer’s ability to pay interest and repay principal.■  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. Among other investments, lower-grade bonds may be particularly sensitive to changes in the economy.■  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.■  Liquidity Risk. Trading opportunities are more limited for fixed-income securities that have not received any credit ratings, have received ratings below investment-grade or are not widely held or are issued by companies located in emerging markets. Over-the-counter (OTC) derivative contracts generally carry greater liquidity risk than exchange-traded contracts. This risk may be increased in times of financial stress, if the trading market for OTC derivative contracts becomes restricted.■  Risk of Foreign Investing. Because the Fund invests in securities issued by foreign companies and national governments, 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.■  Currency Risk. Exchange rates for currencies fluctuate daily. Accordingly, the Fund may experience increased volatility 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.■  Interest Rate Risk. Prices of fixed-income securities generally fall when interest rates rise. The longer the duration of a fixed-income security, the more susceptible it is to interest rate risk. Recent and potential future changes in monetary policy made by central banks and/or their governments are likely to affect the level of interest rates.■  Risk of Loss after Redemption. The investment companies in which the Fund invests may cause the Fund to experience delays from the time it requests a redemption to the time that such redemption is processed.■  Credit Enhancement Risk. The securities in which the Fund invests may be subject to credit enhancement (for example, guarantees, letters or credit or bond insurance). Credit enhancement is designed to help assure timely pay of the security; it does not protect the Fund against losses caused by declines in a security’s value due to changes in market conditions.■  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.■  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 interest rate, credit, currency, liquidity and leverage risks.■  Custodial Services and Related Investment Costs. Custodial services and other costs relating to investment in international securities markets generally are more expensive settlement and clearance procedures than in 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.■  Risk of Non-Diversified Fund. The Fund is non-diversified. Compared to diversified mutual funds, it may invest a higher percentage of its assets among fewer issuers of portfolio securities. This increases the Fund’s risk by magnifying the impact (positively or negatively) that any one issuer has on the Fund’s Share price and performance. In certain situations, being non-diversified may reduce the Fund’s credit risk by enabling it to avoid investing in certain countries, regions or sectors that exhibit above average credit risk.■  Stock Market Risk. The value of equity securities in a Fund’s portfolio will fluctuate and, as a result, a 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.■  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) that has the same investment objectives, strategies and policies. The price of an ETF can fluctuate up or down, and the Fund could lose money investing in an ETF if the prices of the securities owned by the ETF go down.■  Technology Risk. The Adviser uses various technologies in managing the Fund, consistent with its investment objective 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;">All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund.</span>
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	<span style="color:#000000;font-family:Times New Roman;font-size:10pt;">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.</span>
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	<span style="color:#000000;font-family:Times New Roman;font-size:10pt;font-weight:bold;"> Risk of Non-Diversified Fund.</span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> The Fund is non-diversified. Compared to diversified mutual funds, it may invest a higher percentage of its assets among fewer issuers of portfolio securities. This increases the Fund’s risk by magnifying the impact (positively or negatively) that any one issuer has on the Fund’s Share price and performance. In certain situations, being non-diversified may reduce the Fund’s credit risk by enabling it to avoid investing in certain countries, regions or sectors that exhibit above average credit risk.</span>
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	<span style="color:#000000;font-family:Arial;font-size:8pt;font-weight:bold;margin-left:0%;text-transform:uppercase;">Performance: Bar Chart and Table</span><span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;margin-left:0%;">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;">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.</span>
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	<span style="color:#000000;font-family:Times New Roman;font-size:10pt;">1-800-341-7400</span>
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	<span style="color:#000000;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;">The Fund’s performance will </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">fluctuate, and past performance (before and after taxes) is not necessarily an indication of future results.</span>
Bar Chart [Heading]	rr_BarChartHeading	Federated Hermes Emerging Market Debt Fund – A Class
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	<span style="color:#000000;font-family:Arial;font-size:6.6pt;font-style:italic;">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.</span>
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 13.53% (quarter ended June 30, 2020). Its lowest quarterly return was (15.39)% (quarter ended March 31, 2020).
Performance Table Heading	rr_PerformanceTableHeading	<span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;margin-left:0%;">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 a 401(k) plan, an Individual Retirement </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">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 </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">returns are shown only for A class, and after-tax returns for C andIS classes will differ from those shown below for A class.</span>
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	The Fund’s IS class commenced operations on March 30, 2012. For the period prior to commencement of operations of IS class, the performance information shown is for the Fund’s A class. The performance of A class has not been adjusted to reflect the expenses of IS class since IS class has a lower expense ratio than the expense ratio of A class. The performance of A class has been adjusted to remove any voluntary waiver of Fund expenses related to A class that may have occurred during the period prior to commencement of operations of IS class. 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 andIS classes will differ from those shown below 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 a 401(k) plan, an Individual Retirement Account (IRA) or other tax-advantaged investment plan.(For the Period Ended December 31, 2020)
Fee Waiver Or Reimbursement Over Assets, Later Of Termination Or Next Effective Prospectus	federate_FeeWaiverOrReimbursementOverAssetsLaterOfTerminationOrNextEffectiveProspectus	<span style="color:#000000;font-family:Arial;font-size:6.4pt;">up to but not including the later of (the “Termination Date”): </span><span style="color:#000000;font-family:Arial;font-size:6.4pt;">(a) </span><span style="color:#000000;font-family:Arial;font-size:6.4pt;">February 1, 2022</span><span style="color:#000000;font-family:Arial;font-size:6.4pt;">; or (b) the date of the Fund’s next effective Prospectus.</span>
Federated Hermes Emerging Market Debt Fund | A
Risk Return Abstract	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.50%
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	0.85%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	1.50%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.35%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(1.16%)	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.19%
1 Year	rr_ExpenseExampleYear01	$ 677
3 Years	rr_ExpenseExampleYear03	1,150
5 Years	rr_ExpenseExampleYear05	1,649
10 Years	rr_ExpenseExampleYear10	3,015
1 Year	rr_ExpenseExampleNoRedemptionYear01	677
3 Years	rr_ExpenseExampleNoRedemptionYear03	1,150
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,649
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 3,015
2011	rr_AnnualReturn2011	6.43%
2012	rr_AnnualReturn2012	19.14%
2013	rr_AnnualReturn2013	(8.32%)
2014	rr_AnnualReturn2014	(0.15%)
2015	rr_AnnualReturn2015	(3.33%)
2016	rr_AnnualReturn2016	6.98%
2017	rr_AnnualReturn2017	10.36%
2018	rr_AnnualReturn2018	(5.17%)
2019	rr_AnnualReturn2019	12.89%
2020	rr_AnnualReturn2020	5.79%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	highest quarterly return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2020
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	13.53%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	lowest quarterly return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2020
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(15.39%)
1 Year	rr_AverageAnnualReturnYear01	1.05%
5 Years	rr_AverageAnnualReturnYear05	5.01%
10 Years	rr_AverageAnnualReturnYear10	3.66%
Federated Hermes Emerging Market Debt 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	0.85%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other Expenses	rr_OtherExpensesOverAssets	1.49%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	3.09%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(1.15%)	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.94%
1 Year	rr_ExpenseExampleYear01	$ 412
3 Years	rr_ExpenseExampleYear03	954
5 Years	rr_ExpenseExampleYear05	1,620
10 Years	rr_ExpenseExampleYear10	3,402
1 Year	rr_ExpenseExampleNoRedemptionYear01	312
3 Years	rr_ExpenseExampleNoRedemptionYear03	954
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,620
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 3,402
1 Year	rr_AverageAnnualReturnYear01	3.91%
5 Years	rr_AverageAnnualReturnYear05	5.17%
10 Years	rr_AverageAnnualReturnYear10	3.35%
Federated Hermes Emerging Market Debt 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	0.85%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	1.24%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.09%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(1.15%)	[1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	0.94%
1 Year	rr_ExpenseExampleYear01	$ 212
3 Years	rr_ExpenseExampleYear03	655
5 Years	rr_ExpenseExampleYear05	1,124
10 Years	rr_ExpenseExampleYear10	2,421
1 Year	rr_ExpenseExampleNoRedemptionYear01	212
3 Years	rr_ExpenseExampleNoRedemptionYear03	655
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,124
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 2,421
1 Year	rr_AverageAnnualReturnYear01	5.93%
5 Years	rr_AverageAnnualReturnYear05	6.24%
10 Years	rr_AverageAnnualReturnYear10	4.36%
Federated Hermes Emerging Market Debt Fund | Return After Taxes on Distributions | A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(0.42%)
5 Years	rr_AverageAnnualReturnYear05	3.67%
10 Years	rr_AverageAnnualReturnYear10	1.92%
Federated Hermes Emerging Market Debt Fund | Return After Taxes on Distributions and Sale of Fund Shares | A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	0.58%
5 Years	rr_AverageAnnualReturnYear05	3.25%
10 Years	rr_AverageAnnualReturnYear10	2.07%
Federated Hermes Emerging Market Debt Fund | JPMorgan Emerging Markets Bond Index Global(reflects no deduction for fees, expenses or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	5.88%	[2]
5 Years	rr_AverageAnnualReturnYear05	6.84%	[2]
10 Years	rr_AverageAnnualReturnYear10	5.97%	[2]
Federated Hermes Emerging Market Debt Fund | Morningstar Emerging Market Bond Funds Average
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	5.09%	[3]
5 Years	rr_AverageAnnualReturnYear05	6.68%	[3]
10 Years	rr_AverageAnnualReturnYear10	4.93%	[3]
Federated Hermes Emerging Market Debt Fund | Blended Index(reflects no deduction for fees, expenses or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	4.08%	[4]
5 Years	rr_AverageAnnualReturnYear05	6.94%	[4]
10 Years	rr_AverageAnnualReturnYear10	5.61%	[4]

[1] 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, dividends and other expenses related to short sales, 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 1.18%, 1.93% and 0.93% (the “Fee Limit”), respectively, up to but not including the later of (the “Termination Date”): (a) February 1, 2022; 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 Fund’s Board of Directors.

[2] The JPMorgan Emerging Markets Bond Index Global tracks total returns for traded external debt instruments in the emerging markets.

[3] Morningstar figures represent the average of the total returns reported by all the mutual funds designated by Morningstar as falling into the respective category indicated. They do not reflect sales charges.

[4] The Blended Index is comprised of an equal weighting of JPMorgan Emerging Markets Bond Index Global, JPMorgan Corporate Emerging Market Bond and JPMorgan Government Bond Index-Emerging Markets-Unhedged. The JPMorgan Emerging Markets Bond Index Global tracks total returns for traded external debt instruments in the emerging markets. The JPMorgan Corporate Emerging Market Bond Index is a global, corporate emerging markets benchmark that tracks U.S.-denominated corporate bonds issued by emerging markets entities. The JPMorgan Government Bond Index-Emerging Markets-Unhedged tracks local currency government bonds issued by emerging markets.