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Risk Return Abstract rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FEDERATED HERMES INCOME SECURITIES TRUST
Prospectus Date rr_ProspectusDate Jun. 30, 2022
Federated Hermes Short-Term Income 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 Short-Term Income 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 seek to provide current income.
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 A2 Shares (A2), Institutional Shares (IS), Service Shares (SS) and Class R6 Shares (R6) 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 $100,000 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 21 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;"> July 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 37% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 37.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts <span style="font-family:Times New Roman;font-size:10pt;">You may qualify for certain sales charge discounts if you and your family invest, or agree to invest </span><span style="font-family:Times New Roman;font-size:10pt;">in the future, at least $</span><span style="font-family:Times New Roman;font-size:10pt;">100,000</span><span style="font-family:Times New Roman;font-size:10pt;"> in certain classes 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;">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 or hold all of your Shares at the end of those periods. 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 cost 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 In pursuing its principal investment strategies, the Fund invests in a diversified portfolio of fixed-income securities consisting of U.S. government and privately issued mortgage-backed and asset-backed securities, corporate debt securities and U.S. Treasury and agency securities. In addition, at least 65% of the Fund’s securities must be rated A or higher (or, for short-term instruments, in one of the two highest rating categories) by a nationally recognized statistical rating organization (NRSRO). The Fund may invest up to 35% of its assets in noninvestment-grade, fixed-income securities. The Fund may also invest a portion of its portfolio in securities of issuers based outside of the United States. The Fund’s investment adviser (the “Adviser”) seeks to enhance the Fund’s performance by allocating relatively more of its portfolio to the security type that the Adviser expects to offer the best balance between current income and risk. The Fund may invest in derivative contracts, in particular, futures contracts, option contracts and swap contracts, to implement its investment strategies. 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. 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 may invest its assets in securities of other investment companies, including affiliated money market funds and funds advised by the Adviser or its affiliates, as an efficient means of implementing its investment strategies and/or managing its uninvested cash.Although the value of the Fund’s Shares will fluctuate, the Adviser will seek to manage the magnitude of fluctuation by limiting the Fund’s dollar-weighted average duration within a range of one to three years and, in any event, to not more than three years. Duration measures the price sensitivity of a fixed-income security to changes in interest rates. Under normal market conditions, the Fund’s dollar-weighted average maturity is expected to be three years or less.Certain of the government securities in which the Fund invests are not backed by the full faith and credit of the U.S. government, such as those issued by the Federal Home Loan Mortgage Corporation (“Freddie Mac”), the Federal National Mortgage Association (“Fannie Mae”) and the Federal Home Loan Bank System. These entities are, however, supported through federal subsidies, loans or other benefits. The Fund may also invest in government securities that are supported by the full faith and credit of the U.S. government, such as those issued by the Government National Mortgage Association (“Ginnie Mae”). Finally, the Fund may invest in government securities that have no explicit financial support, but which are regarded as having implied support because the federal government sponsors their activities.The Fund will invest its assets so that at least 80% of its net assets (plus any borrowings for investment purposes) are invested in 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 (plus any borrowings for investment purposes) in fixed-income investments.
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:◾ 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.◾ Issuer Credit Risk. It is possible that interest or principal on securities will not be paid when due. Noninvestment-grade securities generally have a higher default risk than investment-grade securities. 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.◾ Call Risk. The Fund’s performance may be adversely affected by the possibility that an issuer of a security held by the Fund may redeem the security prior to maturity at a price below its current market value.◾ Prepayment and Extension Risk. When homeowners prepay their mortgages in response to lower interest rates, the Fund will be required to reinvest the proceeds at the lower interest rates available. Also, when interest rates fall, the price of mortgage-backed securities may not rise to as great an extent as that of other fixed-income securities. When interest rates rise, homeowners are less likely to prepay their mortgages. A decreased rate of prepayments lengthens the expected maturity of a mortgage-backed security, and the price of mortgage-backed securities may decrease more than the price of other fixed-income securities when interest rates rise.◾ Loan Prepayment Risk. During periods of declining interest rates or for other purposes, borrowers may exercise their option to prepay principal earlier than scheduled which may force the Fund to reinvest in lower-yielding debt instruments.◾ Liquidity Risk. The fixed-income securities in which the Fund invests may be less readily marketable and may be subject to greater fluctuation in price than other securities. 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. If this happens, the Fund could incur losses.◾ Loan Liquidity Risk. Loans generally are subject to legal or contractual restrictions on resale. The liquidity of loans, including the volume and frequency of secondary market trading in such loans, varies significantly over time and among individual loans. Loan instruments may not be readily marketable and may be subject to restrictions on resale. In some cases, negotiations involved in disposing of loans may require weeks to complete. Thus, transactions in loan instruments may take longer than seven days to settle. This could pose a liquidity risk to the Fund and, if the Fund’s exposure to such investments is substantial, could impair the Fund’s ability to meet shareholder redemptions in a timely manner.◾ Risk of Investing in Loans. In addition to the risks generally associated with debt instruments, such as credit, market, interest rate, liquidity and derivatives risks, bank loans are also subject to the risk that the value of the collateral securing a loan may decline, be insufficient to meet the obligations of the borrower or be difficult to liquidate. The Fund’s access to the collateral may be limited by bankruptcy, other insolvency laws or by the type of loan the Fund has purchased. For example, if the Fund purchases a participation instead of an assignment, it would not have direct access to collateral of the borrower. As a result, a floating rate loan may not be fully collateralized and can decline significantly in value. Additionally, collateral on loan instruments may consist of assets that may not be readily liquidated, and there is no assurance that the liquidation of such assets will satisfy a borrower’s obligations under the instrument. Loans generally are subject to legal or contractual restrictions on resale.◾ Agent Insolvency Risk. In a syndicated loan, the agent bank is the bank in the syndicate that undertakes the bulk of the administrative duties involved in the day-to-day administration of the loan. In the event of the insolvency of an agent bank, a loan could be subject to settlement risk as well as the risk of interruptions in the administrative duties performed in the day-to-day administration of the loan (such as processing interest rate calculations, processing draws, pursuing certain available contractual remedies, etc.).◾ Leverage Risk. Certain investments may expose the Fund to a level of risk that exceeds the amount invested. Changes in the value of such investments magnify the Fund’s risk of loss and potential for gain.◾ Risk Associated with Noninvestment-Grade Securities. Securities rated below investment grade (which are also known as junk bonds) may be 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 and loans may be particularly sensitive to changes in the economy.◾ Risk of Foreign Investing. Because the Fund invests in securities issued by foreign companies, 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.◾ 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 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, counterparty credit, liquidity and leverage risks.◾ Asset-Backed Securities (ABS) Risk. The value of asset-backed securities (ABS) may be affected by certain factors, such as interest rate risk, credit risk, prepayment risk and the availability of information concerning the pool of underlying assets and its structure. Under certain market conditions, ABS may be less liquid and may be difficult to value. Movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain types of ABS. ABS can also be subject to the risk of default on the underlying assets.◾ MBS Risk. A rise in interest rates may cause the value of mortgage-backed securities (MBS) held by the Fund to decline. Certain MBS issued by GSEs are not backed by the full faith and credit of the U.S. government. A non-agency MBS is subject to the risk that the value of such security will decline, because the security is not issued or guaranteed as to principal or interest by the U.S. government or a GSE. The Fund’s investments in collateralized mortgage obligations (CMOs) may entail greater market, prepayment and liquidity risks than other MBS.◾ 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 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 IS 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 against a broad-based market index. The 0-3 Year Composite Index and the Lipper Short Investment Grade Debt Funds Average show how the Fund’s performance compares against the returns of an index of funds with similar investment objectives. 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 reflect historical performance data for the Fund and are intended to help you </span><span style="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 IS 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="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><span style="font-family:Times New Roman;font-size:10pt;">.</span>
Bar Chart [Heading] rr_BarChartHeading Federated Hermes Short-Term Income Fund - IS Class
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

The Fund's IS class total return for the three-month period from January 1, 2022 to March 31, 2022, was (1.92)%.

Within the periods shown in the bar chart, the Fund's IS class highest quarterly return was 3.11% (quarter ended June 30, 2020). Its lowest quarterly return was (1.42)% (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="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.</span>
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred <span style="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 Account or other tax-advantaged investment plan.</span>
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown <span style="font-family:Times New Roman;font-size:10pt;">After-tax returns are shown only for the IS class, and after-tax returns for A, </span><span style="font-family:Times New Roman;font-size:10pt;">A2, SS and R6 classes will differ from those shown for the IS class.</span>
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock The Fund’s A2 class commenced operations on November 17, 2021. For the periods prior to the commencement of operations of the A2 class, the performance information shown below is for the Fund’s A class, which would be substantially similar to the annual returns for the A2 class over the same period because the classes are invested in the same portfolio of securities and differ only to the extent that the two classes do not have the same sales loads. The performance of the A class has not been adjusted to reflect the expenses applicable to the A2 class, as the two classes have the same net expenses. As the sales load of the A2 class is higher than the sales load of the A class, the net performance of the A2 class would have been lower than the net performance of the A class.The Fund’s R6 class commenced operations on January 20, 2017. For the periods prior to the commencement of operations of the R6 class, the performance information shown is for the IS class prior to its re-designation at the close of business on November 2, 2018 (the “prior IS class”), for each period, except when the R6 class net expenses (increased by waivers and reimbursements applicable to prior IS class (“Adjusted Expenses”)), exceeds the net expenses paid by prior IS class. In those periods, in accordance with SEC guidance, the R6 class total return, adjusted downward by the Adjusted Expenses, is shown.In addition to Return Before Taxes, Return After Taxes is shown for the Fund’s IS class to illustrate the effect of federal taxes on Fund returns. After-tax returns are shown only for the IS class, and after-tax returns for A, A2, SS and R6 classes will differ from those shown for the IS 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 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 fhist_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;"> July 1, 2023</span><span style="font-family:Arial Narrow;font-size:8pt;">; or (b) the date of the Fund’s </span><span style="font-family:Arial Narrow;font-size:8pt;">next effective Prospectus.</span>
Federated Hermes Short-Term Income Fund | A  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 1.00%
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 0.30%
Distribution (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none [1]
Other Expenses rr_OtherExpensesOverAssets 0.40%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.70%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.04%) [2]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 0.66%
1 Year rr_ExpenseExampleYear01 $ 171
3 Years rr_ExpenseExampleYear03 322
5 Years rr_ExpenseExampleYear05 486
10 Years rr_ExpenseExampleYear10 $ 962
1 Year rr_AverageAnnualReturnYear01 (1.23%)
5 Years rr_AverageAnnualReturnYear05 1.63%
10 Years rr_AverageAnnualReturnYear10 1.16%
Federated Hermes Short-Term Income Fund | A2  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 1.50%
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 0.30%
Distribution (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.15% [3]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.70%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.04%) [2]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 0.66%
1 Year rr_ExpenseExampleYear01 $ 220
3 Years rr_ExpenseExampleYear03 371
5 Years rr_ExpenseExampleYear05 534
10 Years rr_ExpenseExampleYear10 $ 1,007
1 Year rr_AverageAnnualReturnYear01 (1.68%)
5 Years rr_AverageAnnualReturnYear05 1.53%
10 Years rr_AverageAnnualReturnYear10 1.12%
Federated Hermes Short-Term Income 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 0.30%
Distribution (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.18%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.48%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.10%) [2]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 0.38%
1 Year rr_ExpenseExampleYear01 $ 49
3 Years rr_ExpenseExampleYear03 154
5 Years rr_ExpenseExampleYear05 269
10 Years rr_ExpenseExampleYear10 $ 604
2012 rr_AnnualReturn2012 3.49%
2013 rr_AnnualReturn2013 0.39%
2014 rr_AnnualReturn2014 1.11%
2015 rr_AnnualReturn2015 0.55%
2016 rr_AnnualReturn2016 1.77%
2017 rr_AnnualReturn2017 1.89%
2018 rr_AnnualReturn2018 1.58%
2019 rr_AnnualReturn2019 4.48%
2020 rr_AnnualReturn2020 3.75%
2021 rr_AnnualReturn2021 (0.08%)
Year to Date Return, Label rr_YearToDateReturnLabel The Fund's IS class total return for the three-month period
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (1.92%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 3.11%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (1.42%)
1 Year rr_AverageAnnualReturnYear01 (0.08%) [4]
5 Years rr_AverageAnnualReturnYear05 2.31% [4]
10 Years rr_AverageAnnualReturnYear10 1.89% [4]
Federated Hermes Short-Term Income Fund | SS  
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 0.30%
Distribution (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.45%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.75%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.09%) [2]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 0.66%
1 Year rr_ExpenseExampleYear01 $ 77
3 Years rr_ExpenseExampleYear03 240
5 Years rr_ExpenseExampleYear05 417
10 Years rr_ExpenseExampleYear10 $ 930
1 Year rr_AverageAnnualReturnYear01 (0.36%) [4]
5 Years rr_AverageAnnualReturnYear05 2.11% [4]
10 Years rr_AverageAnnualReturnYear10 1.69% [4]
Federated Hermes Short-Term Income Fund | R6  
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 0.30%
Distribution (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.12%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.42%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.07%) [2]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 0.35%
1 Year rr_ExpenseExampleYear01 $ 43
3 Years rr_ExpenseExampleYear03 135
5 Years rr_ExpenseExampleYear05 235
10 Years rr_ExpenseExampleYear10 $ 530
1 Year rr_AverageAnnualReturnYear01 (0.05%)
5 Years rr_AverageAnnualReturnYear05 2.38%
10 Years rr_AverageAnnualReturnYear10 1.81%
Federated Hermes Short-Term Income Fund | Return After Taxes on Distributions | IS  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (0.60%) [4]
5 Years rr_AverageAnnualReturnYear05 1.46% [4]
10 Years rr_AverageAnnualReturnYear10 1.12% [4]
Federated Hermes Short-Term Income Fund | Return After Taxes on Distributions and Sale of Fund Shares | IS  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (0.03%) [4]
5 Years rr_AverageAnnualReturnYear05 1.40% [4]
10 Years rr_AverageAnnualReturnYear10 1.11% [4]
Federated Hermes Short-Term Income Fund | Bloomberg 1-3 Year US Government/Credit Index(reflects no deduction for fees, expenses or taxes)  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (0.47%) [5]
5 Years rr_AverageAnnualReturnYear05 1.85% [5]
10 Years rr_AverageAnnualReturnYear10 1.39% [5]
Federated Hermes Short-Term Income Fund | 0-3 Year Composite Index(reflects no deduction for fees, expenses or taxes)  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (0.34%) [6]
5 Years rr_AverageAnnualReturnYear05 2.21% [6]
10 Years rr_AverageAnnualReturnYear10 1.82% [6]
Federated Hermes Short-Term Income Fund | Lipper Short Investment Grade Debt Funds Average  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.07% [7]
5 Years rr_AverageAnnualReturnYear05 2.14% [7]
10 Years rr_AverageAnnualReturnYear10 1.82% [7]
[1] The Fund has adopted a Distribution (12b-1) Plan for its A class shares pursuant to which the A class of the Fund may incur and pay a Distribution (12-1) 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 Fund’s Board of Trustees (the “Trustees”).
[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, interest expense, extraordinary expenses and proxy-related expenses paid by the Fund, if any) paid by the Fund’s A, A2, IS, SS and R6 classes (after the voluntary waivers and/or reimbursements) will not exceed 0.65%, 0.65%, 0.37%, 0.65% and 0.34% (the “Fee Limit”), respectively, up to but not including the later of (the “Termination Date”): (a) July 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 Trustees.
[3] The Fund may incur and pay certain service fees (shareholder services/account administration fees) on its A2 class of up to a maximum of 0.25%. No such fees are currently incurred and paid by the A2 class of the Fund. The A2 class of the Fund will not incur and pay such fees until such time as approved by the Trustees.
[4] Effective November 2, 2018, several classes were converted or re-designated. Prior to these changes occurring, Institutional Shares were designated as Class Y Shares and Service Shares were designated as Institutional Shares. References herein refer to the new class designations unless otherwise noted.
[5] The Bloomberg 1-3 Year US Government/Credit Index is an unmanaged index considered representative of performance of short-term U.S. corporate bonds and U.S. government bonds with maturities from one to three years. Effective August 24, 2021, the name of the index changed from “Bloomberg Barclays 1-3 Year US Government/Credit Index” to “Bloomberg 1-3 Year US Government/Credit Index.”
[6] The 0-3 Year Composite Index is a blended index of four separate indexes which track various security types. The four component indexes (and respective weightings)* are:
ICE BofA 1-3 Year US Corporate Index (30%): a subset of the ICE BofA US Corporate Index including all securities with a remaining term to final maturity less than three years. ICE BofA US Corporate Index tracks the performance of U.S. dollar denominated investment-grade corporate debt publicly issued in the U.S. domestic market.
ICE BofA 0-3 Year US Fixed Rate Asset Backed Securities Index (30%): a subset of the ICE BofA US Fixed Rate Asset Backed Securities Index including all securities with an average life less than three years. ICE BofA US Fixed Rate Asset Backed Securities Index tracks the performance of U.S. dollardenominated investment-grade fixed rate asset-backed securities publicly issued in the U.S. domestic market.
ICE BofA 1-3 Year US Treasury & Agency Index (20%): a subset of the ICE BofA US Treasury & Agency Index including all securities with a remaining term to final maturity less than three years. ICE BofA US Treasury & Agency Index tracks the performance of U.S. dollar denominated U.S. Treasury and non-subordinated U.S. agency debt issued in the U.S. domestic market.
ICE BofA 0-3 Year US Mortgage Backed Securities Index (20%): a subset of the ICE BofA US Mortgage Backed Securities Index including all securities with an average life less than three years. ICE BofA US Mortgage Backed Securities Index tracks the performance of U.S. dollar denominated fixed-rate and hybrid residential mortgage pass-through securities publicly issued by U.S. agencies in the U.S. domestic market.
* The weightings assigned to each component index of the 0-3 Year Composite Index are fixed, but do not necessarily reflect the Fund’s allocation to the type of fixed-income securities represented by the component indexes, which will vary.
[7] Lipper figures represent the average of the total returns reported by all the mutual funds designated by Lipper, Inc. as falling into the respective category indicated. They do not reflect sales charges.