Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	FEDERATED HERMES ADVISER SERIES
Prospectus Date	rr_ProspectusDate	Jul. 31, 2022
Class A and C Shares | Federated Hermes International Growth 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 Growth 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 seeks to provide long-term capital appreciation. The objective may be changed by the Fund’s Board of Trustees (the “Trustees”) without shareholder approval.
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) and Class C Shares (C) 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 certain sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain classes 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 16 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 Narrow;font-size:8pt;">September 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 47% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	47.00%
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 </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">discounts if you and your family invest, or agree to invest in the future, at least $</span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">50,000</span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> in certain classes of Federated Hermes Funds.</span>
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 50,000
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	<span style="color:#000000;font-family:Arial Narrow;font-size:8pt;">Other Expenses are based on estimated amounts for the current fiscal year.</span>
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 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. 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 to provide long-term capital appreciation by investing primarily in a portfolio of equity securities that are tied economically to a number of countries throughout the world and typically invests in three or more countries outside of the United States (U.S.). The Fund has broad discretion to invest in equity securities of any market capitalization and issuers located or doing business throughout the world, including in both developed and developing or emerging markets. However, the Fund principally invests in companies with a market capitalization in excess of $500 million, and the Fund does not expect to make additional investments in developing or emerging markets if it would cause the Fund to have a greater than 10% overweight position to developing or emerging markets as compared to the exposure of the MSCI ACWI ex USA Growth Index to such markets. The Fund may make significant investments (e.g., more than 25% of the Fund’s portfolio) in issuers located or doing business in a single country.The Fund’s investments in equity securities may include, for example, common stocks, American Depositary Receipts or other U.S. listings of foreign common stocks. The Fund may use closed-end funds and derivative instruments to gain broad exposure to markets and/or a particular index. For example, the Fund may use derivative contracts to increase or decrease the portfolio’s exposure to the investment(s) underlying the derivative instruments in an attempt to benefit from changes in the value of the underlying investment(s), to realize gains from trading a derivative contract or to hedge against potential losses. There can be no assurance that the Fund’s use of futures contracts will work as intended.Federated Global Investment Management Corp.’s (the “Adviser”) investment process seeks to identify companies with robust and sustainable growth rates, high-quality balance sheets, and management teams with clearly defined growth strategies. In allocating the Fund’s assets, the Adviser also incorporates information on the economic and financial market conditions within each country. The Adviser’s proprietary quantitative model drives country allocation, while individual stocks are selected through a qualitative process that incorporates a multi-factor approach to find companies with sustainable growth characteristics. The Adviser seeks to control risk by seeking diversification across sectors and using both fundamental and statistical models to evaluate potential volatility. The Adviser’s portfolio construction process seeks to combine the best investment candidates within the Adviser’s recommended framework of country allocations.The Fund utilizes an active trading approach. The Adviser may choose to sell a holding when, for example, in the Adviser’s view, it no longer represents an attractive investment or to take advantage of what it considers to be a better investment opportunity.
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.◾ 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.◾ 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.◾ Focused Investment Risk. To the extent that the Fund focuses its investments in the securities of a particular issuer or companies in a particular country, group of countries, region, market, industry, group of industries, sector, or asset class, the Fund’s exposure to various risks may be heightened, including price volatility and adverse economic, market, political, or regulatory occurrences affecting that issuer, country, group of countries, region, market, industry, group of industries, sector, or asset class.◾ Large Shareholder Risk. A significant percentage of the Fund’s shares may be owned or controlled by a large shareholder, such as other funds or accounts, including those of which the Adviser or an affiliate of the Adviser may have investment discretion. Accordingly, the Fund can be subject to the potential for large scale inflows and outflows as a result of purchases and redemptions made by significant shareholders. These inflows and outflows could be significant and, if frequently occurring, could negatively affect the Fund’s net asset value and performance and could cause the Fund to sell securities at inopportune times in order to meet redemption requests. Investments in the Fund by other investment companies also can create conflicts of interests for the Adviser to the Fund and the investment adviser to the acquiring fund. For example, a conflict of interest can arise due to the possibility that the investment adviser to the acquiring fund could make a decision to redeem the acquiring fund’s investment in the Fund. In the case of an investment by an affiliated fund, a conflict of interest can arise if, because of the acquiring fund’s investment in the Fund, the Fund is able to garner more assets from third-party investors, thereby growing the Fund and increasing the management fees received by the Adviser, which could also be the investment adviser to the acquiring fund.◾ 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.◾ 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.◾ 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 holdings of such currencies or holdings 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.◾ Risk Related to Investing for Growth. Due to their relatively high valuations, growth stocks are typically more volatile than value stocks. For instance, the price of a growth stock may experience a larger decline on a forecast of lower earnings, a negative fundamental development, or an adverse market development. Further, growth stocks may not pay dividends or may pay lower dividends than value stocks. This means they depend more on price changes for returns and may be more adversely affected in a down market compared to value stocks that pay higher dividends.◾ Liquidity Risk. The securities in which the Fund invests may be less readily marketable and may be subject to greater fluctuation in price than other securities.◾ 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.◾ 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.◾ Risk of Investing in Derivative Contracts. Derivative contracts 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 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 may also involve other risks described in this Prospectus, such as stock market, interest rate, credit, currency and liquidity risks.◾ 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.◾ Quantitative Modeling Risk. The Fund employs quantitative models as a management technique. These models examine multiple economic factors using various proprietary and third-party data. The results generated by quantitative analysis may perform differently than expected and may negatively affect Fund performance for various reasons (for example, human judgment, data imprecision, software or other technology malfunctions, or programming inaccuracies).◾ 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;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 Fund is the legal entity successor to the PNC International Growth Fund (“Predecessor Fund”), a portfolio of PNC Funds, pursuant to a tax-free reorganization that took place on November 15, 2019. Pursuant to the reorganization, the Fund is the legal entity survivor and the Predecessor Fund is the accounting and tax survivor of the reorganization. Accordingly, the performance information, including information on fees and expenses and financial information provided in this prospectus for periods prior to the reorganization (the Fund’s commencement of investment operations) is historical information for the Predecessor Fund. The Predecessor Fund was managed by the same portfolio management team as the Fund, had an identical investment objective and substantially identical strategies, policies, and restrictions. Given the above, unless specifically stated otherwise, subsequent references in this section to the Fund should be read to include the Predecessor Fund.The Fund’s A and C classes have not yet commenced operations. The Fund currently offers two other classes of shares: Institutional Shares (“IS class”) and Class R6 Shares. For periods prior to the reorganization (the Fund’s commencement of investment operations), the performance of the Fund’s IS class is the historical performance of the Predecessor Fund’s I class. For the periods prior to the commencement of operations of the A and C classes, the performance information shown below is for the Fund’s IS class. The performance of the IS class has not been adjusted to reflect the expenses applicable to the A or C class. The performance has been adjusted to reflect the differences in sale charges and deferred sales charges applicable to A class and C class. The A, C and IS classes are invested in the same portfolio of securities and the annual returns will differ only to the extent that the classes do not have the same expenses or sales loads. It is anticipated that the expense ratios of the A and C classes will be higher than the expense ratio of the IS class; accordingly, the actual performance of the A and C classes is anticipated to be lower than the performance of the IS class.The bar chart and performance table below 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 IS class total returns on a calendar year-by-year basis.The Average Annual Total Return table shows returns 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="font-family:Times New Roman;font-size:10pt;margin-left:10pt;">The bar chart and performance table below are intended to help you analyze the Fund’s investment risks in light of its </span><span style="font-family:Times New Roman;font-size:10pt;">historical returns. The bar chart shows the variability of the Fund’s IS class total returns on a calendar year-by-year basis.</span>
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	<span style="font-family:Times New Roman;font-size:10pt;margin-left:10pt;">The Fund’s A and C classes have not yet commenced operations. The A and C class performance information shown </span><span style="font-family:Times New Roman;font-size:10pt;">below is for the Fund’s IS class as described above. In addition to Return Before Taxes, Return After Taxes is shown for the Funds 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 the C class will differ from those shown for A class.</span><span style="font-family:Times New Roman;font-size:10pt;line-height:12pt;"> </span><span style="font-family:Times New Roman;font-size:10pt;font-style:italic;"> Actual after-tax returns depend on each investor’s personal tax situation, and are likely to differ from those shown</span><span style="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="font-family:Times New Roman;font-size:10pt;font-weight:bold;">federal</span><span style="font-family:Times New Roman;font-size:10pt;"> income and capital gains tax rates. These after-tax returns do </span><span style="font-family:Times New Roman;font-size:10pt;font-weight:bold;">not</span><span style="font-family:Times New Roman;font-size:10pt;"> reflect the effect of any applicable </span><span style="font-family:Times New Roman;font-size:10pt;font-weight:bold;">state</span><span style="font-family:Times New Roman;font-size:10pt;"> and </span><span style="font-family:Times New Roman;font-size:10pt;font-weight:bold;">local</span><span style="font-family:Times New Roman;font-size:10pt;"> 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 plans.</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="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 Growth Fund - IS Class
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	The Fund’s IS class total return for the six-month period from January 1, 2022 to June 30, 2022, was (28.69)%.Within the periods shown in the bar chart, the Fund’s IS class highest quarterly return was 31.97% (quarter ended June 30, 2020). Its lowest quarterly return was (18.97)% (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 Narrative	rr_PerformanceTableNarrativeTextBlock	The Fund’s A and C classes have not yet commenced operations. The A and C class performance information shown below is for the Fund’s IS class as described above. In addition to Return Before Taxes, Return After Taxes is shown for the Funds 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 the C class 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 a 401(k) plan, an Individual Retirement Account (IRA) or other tax-advantaged investment plans.(For the Period Ended December 31, 2021)
Fee Waiver Or Reimbursement Over Assets, Later Of Termination Or Next Effective Prospectus	fhas_FeeWaiverOrReimbursementOverAssetsLaterOfTerminationOrNextEffectiveProspectus	<span style="font-family:Arial Narrow;font-size:8pt;">up to but not including the later of (the “Termination Date”): (a) </span><span style="font-family:Arial Narrow;font-size:8pt;">September 1, 2023</span><span style="font-family:Arial Narrow;font-size:8pt;">; or (b) the date of the </span><span style="font-family:Arial Narrow;font-size:8pt;">Fund’s next effective Prospectus.</span>
Class A and C Shares | Federated Hermes International Growth 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	0.75%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	none	[1]
Other Expenses	rr_OtherExpensesOverAssets	0.53%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.28%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.18%)	[3]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.10%
1 Year	rr_ExpenseExampleYear01	$ 673
3 Years	rr_ExpenseExampleYear03	934
5 Years	rr_ExpenseExampleYear05	1,214
10 Years	rr_ExpenseExampleYear10	2,010
1 Year	rr_ExpenseExampleNoRedemptionYear01	673
3 Years	rr_ExpenseExampleNoRedemptionYear03	934
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,214
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 2,010
1 Year	rr_AverageAnnualReturnYear01	0.95%
5 Year	rr_AverageAnnualReturnYear05	17.79%
Since Inception	rr_AverageAnnualReturnSinceInception	15.64%
Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 29, 2016
Class A and C Shares | Federated Hermes International Growth 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	0.75%
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other Expenses	rr_OtherExpensesOverAssets	0.53%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.03%
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.18%)	[3]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.85%
1 Year	rr_ExpenseExampleYear01	$ 306
3 Years	rr_ExpenseExampleYear03	637
5 Years	rr_ExpenseExampleYear05	1,093
10 Years	rr_ExpenseExampleYear10	2,166
1 Year	rr_ExpenseExampleNoRedemptionYear01	206
3 Years	rr_ExpenseExampleNoRedemptionYear03	637
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,093
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 2,166
1 Year	rr_AverageAnnualReturnYear01	5.80%
5 Year	rr_AverageAnnualReturnYear05	19.12%
Since Inception	rr_AverageAnnualReturnSinceInception	16.76%
Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 29, 2016
Class A and C Shares | Federated Hermes International Growth Fund | IS
Risk Return Abstract	rr_RiskReturnAbstract
Year to Date Return, Label	rr_YearToDateReturnLabel	The Fund's IS class total return for the six-month period
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2022
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(28.69%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	highest quarterly return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2020
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	31.97%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	lowest quarterly return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2020
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(18.97%)
Class A and C Shares | Federated Hermes International Growth Fund | Return After Taxes on Distributions | A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	0.03%
5 Year	rr_AverageAnnualReturnYear05	16.29%
Since Inception	rr_AverageAnnualReturnSinceInception	14.35%
Class A and C Shares | Federated Hermes International Growth Fund | Return After Taxes on Distributions and Sale of Fund Shares | A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	1.22%
5 Year	rr_AverageAnnualReturnYear05	14.11%
Since Inception	rr_AverageAnnualReturnSinceInception	12.47%
Class A and C Shares | Federated Hermes International Growth Fund | MSCI ACWI ex USA Growth Index1(reflects no deduction for fees, expenses or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	5.09%	[4]
5 Year	rr_AverageAnnualReturnYear05	13.06%	[4]
Since Inception	rr_AverageAnnualReturnSinceInception	12.57%	[4]
Class A and C Shares | Federated Hermes International Growth Fund | Morningstar Foreign Large Growth Funds Average2
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	7.69%	[5]
5 Year	rr_AverageAnnualReturnYear05	14.11%	[5]
Since Inception	rr_AverageAnnualReturnSinceInception	12.82%	[5]

[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 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 Trustees.

[2] Other Expenses are based on estimated amounts for the current fiscal year.

[3] 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 and C classes (after the voluntary waivers and/or reimbursements) will not exceed 1.09% and 1.84% (the “Fee Limit”), respectively, up to but not including the later of (the “Termination Date”): (a) September 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 additional arrangements prior to the Termination Date, these additional arrangements may only be terminated or the Fee Limit increased prior to the Termination Date with the agreement of the Trustees.

[4] The MSCI All Country World (ACWI) ex USA Growth Index is designed to measure the performance of growth companies within developed and emerging equity markets, excluding the U.S. and frontier markets.

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