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Risk Return Abstract rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FEDERATED HERMES MONEY MARKET OBLIGATIONS TRUST
Prospectus Date rr_ProspectusDate Feb. 28, 2022
Cash II Shares | Federated Hermes New York Municipal Cash Trust  
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:Times New Roman;font-size:14pt;margin-left:2.33pt;">–Cash II Shares</span><span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">Federated Hermes New York Municipal Cash Trust (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 is a money market fund that seeks to maintain a stable net asset value (NAV) of $1.00 per Share. The Fund’s investment objective is to provide current income exempt from federal regular income tax and the personal income taxes imposed by New York State and New York municipalities consistent with stability of principal.
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 Cash II Shares (CII) 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.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">Shareholder Fees (fees paid directly from your investment)</span>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)</span>
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination <span style="font-family:Arial;font-size:6.4pt;"> March 1, </span><span style="font-family:Arial;font-size:6.4pt;">2023</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 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 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 invests primarily in a portfolio of high-quality New York tax-exempt securities maturing in 397 days or less. The Fund will invest its assets so that, normally, distributions of annual interest income are exempt from federal regular income tax and the personal income taxes imposed by New York State and New York municipalities. The Fund’s investment adviser (the “Adviser”) also normally (except as discussed in this Prospectus) will invest the Fund’s assets entirely in securities whose interest is not subject to (or not a specific preference item for purposes of) the federal alternative minimum tax for individuals (AMT), such that, normally, distributions of annual interest income also are exempt from the AMT. However, in certain circumstances (such as, for example, when there is a lack of supply of non-AMT securities or other tax-exempt securities or there are advantageous market conditions, or if there are changes in the tax laws relating to AMT), to pursue the Fund’s investment objective, the Adviser may leave a portion of the Fund’s assets uninvested or may invest the Fund’s assets in securities the interest from which may be subject to AMT, state and/or federal income tax. These acquisitions may occur in the ordinary course or in connection with Fund reorganization transactions (i.e., transactions in which the Fund acquires the portfolio securities of other mutual funds) or another event or circumstance. The Fund’s Adviser actively manages the Fund’s portfolio, seeking to limit the credit risk taken by the Fund and to select investments with appropriate risk-adjusted returns.Tax-exempt securities are fixed-income securities that, in the opinion of bond counsel to the issuer or on the basis of another authority believed by the Adviser to be reliable, pay interest that is not subject to federal regular income taxes. The types of securities in which the Fund may principally invest include: (a) tax-exempt securities such as the following types, some of which may be subject to credit enhancement: variable rate demand instruments, municipal notes, general obligation bonds, special revenue bonds, private activity bonds and tax-exempt commercial paper; and (b) interests in securities of other investment companies.In pursuing its investment objective and implementing its investment strategies, the Fund will comply with Rule 2a-7 under the Investment Company Act of 1940, as amended (“Rule 2a-7”).Under normal circumstances, the Fund will invest its assets so that at least 80% of its annual interest income will be exempt from federal regular income tax and the personal income taxes imposed by New York State and New York municipalities or so that at least 80% of its net assets is invested in obligations, the interest income from which is exempt from federal regular income tax and the personal income taxes imposed by New York State and New York municipalities. Only for purposes of compliance with Rule 35d-1, the Fund will invest its assets so that at least 80% of the income that it distributes will be exempt from federal regular income tax and the personal income taxes imposed by the State of New York and New York municipalities. These policies may not be changed without shareholder approval.
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 Pursuant to Rule 2a-7 the Fund is designated as a “retail” money market fund and is permitted to use amortized cost to value its portfolio securities and to transact at a stable $1.00 net asset value. As a retail money market fund, the Fund has adopted policies and procedures reasonably designed to limit investments in the Fund to accounts beneficially owned by natural persons. In addition, the Fund has adopted policies and procedures to impose liquidity fees on redemptions and/or temporary redemption gates in the event that the Fund’s weekly liquid assets were to fall below a designated threshold, if the Fund’s Board determines that such liquidity fees or redemption gates are in the best interest of the Fund.All mutual funds take investment risks. Therefore, even though the Fund is a money market fund that seeks to maintain a stable NAV, it is possible to lose money by investing in the Fund. The primary factors that may negatively impact the Fund’s ability to maintain a stable NAV, delay the payment of redemptions by the Fund, or reduce the Fund’s daily dividends include:■ Tax-Exempt Securities Risk. The securities in which the Fund invests may include those issued by state or local governments, other political subdivisions or authorities, or directly or indirectly supported by taxes, assessments, tolls, fees or other revenue collected by or otherwise derived from or through such issuers. Special factors, such as legislative changes, and state and local economic and business developments, may adversely affect the yield and/or value of the Fund’s investments in tax-exempt securities.■ Issuer Credit Risk. It is possible that interest or principal on securities will not be paid when due. Money market funds try to minimize this risk by purchasing higher-quality securities.■ Counterparty Credit Risk. A party to a transaction involving the Fund may 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 strategies.■ 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.■ Interest Rate Risk. Prices of fixed-income securities (including tax-exempt securities) generally fall when interest rates rise. 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. Very low or negative interest rates magnify interest rate risk. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also is likely to be lower or the Fund may be unable to maintain a positive return, or yield, or a stable NAV.■ 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 or above its current market value.■ Sector Risk. A substantial part of the Fund’s portfolio may be comprised of securities issued or credit enhanced by businesses with similar characteristics or by issuers located in the same state. As a result, the Fund will be more susceptible to any economic, business, political or other developments which generally affect these issuers or entities.■ Tax Risk. In order to be tax exempt, tax-exempt securities must meet certain legal requirements. Failure to meet such requirements may cause the interest received and distributed by the Fund to shareholders to be taxable. The Fund may invest in securities whose interest is subject to state tax, federal regular income tax, or AMT. Consult your tax professional for more information.■ Liquidity Risk. Liquidity risk is the risk that the Fund will experience significant net redemptions of Fund Shares at a time when it cannot find willing buyers for its portfolio securities or can only sell its portfolio securities at a material loss.■ Credit Enhancement Risk. The securities in which the Fund invests may be subject to credit enhancement (for example, guarantees, letters of credit or bond insurance). If the credit quality of the credit enhancement provider (for example, a bank or bond insurer) is downgraded, a security credit enhanced by such credit enhancement provider also may be downgraded. Having multiple securities credit enhanced by the same enhancement provider will increase the adverse effects on the Fund that are likely to result from a downgrading of, or a default by, such an enhancement provider. Adverse developments in the banking or bond insurance industries also may negatively affect the Fund, as the Fund may invest in securities credit enhanced by banks or by bond insurers without limit.■ Risk Associated with Investing Share Purchase Proceeds. On days during which there are net purchases of Fund Shares, the Fund must invest the proceeds at prevailing market yields or hold cash. If the yield of the securities purchased is less than that of the securities already in the Fund’s portfolio, or if the Fund holds cash, the Fund’s yield will likely decrease. Conversely, net purchases on days on which short-term yields rise will likely cause the Fund’s yield to increase. In the event of significant changes in short-term yields or significant net purchases, the Fund retains the discretion to close to new investments. However, the Fund is not required to close, and no assurance can be given that this will be done in any given circumstance.■ Risk Associated with use of Amortized Cost. In the unlikely event that the Fund’s Board of Trustees (“Board”) were to determine, pursuant to Rule 2a-7, that the extent of the deviation between the Fund’s amortized cost per share and its market-based NAV per share may result in material dilution or other unfair results to shareholders, the Board will cause the Fund to take such action as it deems appropriate to eliminate or reduce to the extent practicable such dilution or unfair results.■ Additional Factors Affecting Yield. There is no guarantee that the Fund will provide a certain level of income or that any such income will exceed the rate of inflation. Further, the Fund’s yield will vary. Periods of very low or negative interest rates impact, in a negative way, the Fund’s ability to maintain a positive return, or yield, or pay dividends to Fund shareholders.■ New York Risk. Because the Fund will invest a significant portion of its assets in securities of New York issuers, an investment in the Fund may involve additional risks compared to a fully diversified money market fund that invests in multiple states, and the Fund’s performance also may be negatively impacted by other local, state or regional factors. For example, natural disasters may affect the creditworthiness of municipal issuers or otherwise disrupt the local, state or regional economy or certain sectors of the economy. The economies of New York State and New York City are diversified across the finance, insurance, real estate, entertainment and services sectors. Any downturn in these sectors or related industries may adversely affect the economy of the state.■ Fees & Gates Risk. The Fund has adopted policies and procedures such that the Fund will be able to impose liquidity fees on redemptions and/or temporarily suspend redemptions for up to 10 business days in any 90-day period in the event that the Fund’s weekly liquid assets were to fall below a designated threshold, subject to a determination by the Fund’s Board that such liquidity fee or redemption gate is in the Fund’s best interest. If the Fund’s weekly liquid assets fall below 30% of its total assets, the Fund may impose liquidity fees of up to 2% of the value of the shares redeemed and/or temporarily suspend redemptions, if the Board, including a majority of the independent Trustees, determines that imposing a liquidity fee or temporarily suspending redemptions is in the Fund’s best interest. In addition, if the Fund’s weekly liquid assets fall below 10% of its total assets at the end of any business day, the Fund must impose a 1% liquidity fee on shareholder redemptions unless the Board, including a majority of the independent Trustees, determines that imposing such a fee is not in the best interests of the Fund.■ Technology Risk. The Adviser uses various technologies in managing the Fund, consistent with its investment objective(s) and strategy described in this Prospectus. For example, proprietary and third-party data and systems are utilized to support decision making for the Fund. Data imprecision, software or other technology malfunctions, programming inaccuracies and similar circumstances may impair the performance of these systems, which may negatively affect Fund performance.You could lose money by investing in the Fund. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. The Fund may impose a fee upon the sale of your shares or may temporarily suspend your ability to sell shares if the Fund’s liquidity falls below required minimums because of market conditions or other factors. An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not expect that the sponsor will provide financial support to the Fund at any time.
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, even though the Fund is a money market fund that seeks to maintain </span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;">a stable NAV, it is possible to lose money by investing in the Fund.</span><span style="color:#000000;font-family:Times New Roman;font-size:10pt;margin-left:10pt;">You could lose money by investing in the Fund.</span>
Risk Money Market Fund May Not Preserve Dollar [Text] rr_RiskMoneyMarketFundMayNotPreserveDollar <span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so.</span>
Risk Money Market Fund May Impose Fees or Suspend Sales [Text] rr_RiskMoneyMarketFundMayImposeFeesOrSuspendSales <span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> The Fund may impose a fee upon the sale of your shares or may temporarily suspend your ability to sell shares if the Fund’s liquidity falls below required minimums because of market conditions or other factors.</span>
RIsk Not Insured [Text] rr_RiskNotInsured <span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</span>
Risk Money Market Fund Sponsor May Not Provide Support [Text] rr_RiskMoneyMarketFundSponsorMayNotProvideSupport <span style="color:#000000;font-family:Times New Roman;font-size:10pt;"> The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not expect that the sponsor will provide financial support to the Fund at any time.</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 CII class total returns on a calendar year-by-year basis. The Average Annual Total Return Table shows returns averagedover the stated periods. 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 CII 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>
Bar Chart [Heading] rr_BarChartHeading Federated Hermes New York Municipal Cash Trust – CII Class
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Within the periods shown in the bar chart, the Fund's CII class highest quarterly return was 0.25% (quarter ended June 30, 2019). Its lowest quarterly return was 0.00% (quarter ended September 30, 2021).
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 following table represents the Fund’s CII class Average Annual Total Returns for the calendar period ended December 31, 2021.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock The Fund’s CII class 7-Day Net Yield as of December 31, 2021, was 0.01%. You may go to FederatedInvestors.com or call the Fund at 1-800-341-7400 for the current 7-Day Net Yield.
Money Market Seven Day Yield, Caption [Text] rr_MoneyMarketSevenDayYieldCaption <span style="font-family:Arial;font-size:6.6pt;font-style:italic;">The Fund’s CII class 7-Day Net Yield as of December 31, 2021</span>
Money Market Seven Day Yield Phone rr_MoneyMarketSevenDayYieldPhone <span style="font-family:Arial;font-size:6.6pt;font-style:italic;">1-800-341-7400</span>
Money Market Seven Day Yield rr_MoneyMarketSevenDayYield 0.01%
Fee Waiver Or Reimbursement Over Assets, Later Of Termination Or Next Effective Prospectus fhmmot_FeeWaiverOrReimbursementOverAssetsLaterOfTerminationOrNextEffectiveProspectus <span style="font-family:Arial;font-size:6.4pt;">up to but not </span><span style="font-family:Arial;font-size:6.4pt;">including the later of (the “Termination Date”): (a) </span><span style="font-family:Arial;font-size:6.4pt;"> March 1, </span><span style="font-family:Arial;font-size:6.4pt;">2023</span><span style="font-family:Arial;font-size:6.4pt;">; or (b) the date of the Fund’s next effective Prospectus.</span>
Cash II Shares | Federated Hermes New York Municipal Cash Trust | CII  
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 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.49%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.04%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.27%) [1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 0.77%
1 Year rr_ExpenseExampleYear01 $ 106
3 Years rr_ExpenseExampleYear03 331
5 Years rr_ExpenseExampleYear05 574
10 Years rr_ExpenseExampleYear10 $ 1,271
2012 rr_AnnualReturn2012 0.02%
2013 rr_AnnualReturn2013 0.02%
2014 rr_AnnualReturn2014 0.01%
2015 rr_AnnualReturn2015 0.02%
2016 rr_AnnualReturn2016 0.02%
2017 rr_AnnualReturn2017 0.19%
2018 rr_AnnualReturn2018 0.72%
2019 rr_AnnualReturn2019 0.81%
2020 rr_AnnualReturn2020 0.22%
2021 rr_AnnualReturn2021 0.02%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.25%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2021
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn none
1 Year rr_AverageAnnualReturnYear01 0.02%
5 Years rr_AverageAnnualReturnYear05 0.39%
10 Years rr_AverageAnnualReturnYear10 0.20%
[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, interest expense, extraordinary expenses and proxy-related expenses paid by the Fund, if any) paid by the Fund’s CII class (after the voluntary waivers and/or reimbursements) will not exceed 0.77% (the “Fee Limit”) up to but not including the later of (the “Termination Date”): (a) March 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 Fund’s Board of Trustees (the “Trustees”).