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Risk Return Abstract rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FEDERATED HERMES MONEY MARKET OBLIGATIONS TRUST
Prospectus Date rr_ProspectusDate Jul. 01, 2023
Service Shares | Federated Hermes Trust for U S Treasury Obligations  
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;">–Service Shares</span><span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">Federated Hermes Trust for U.S. Treasury Obligations (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 stability of principal and current income 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 Service Shares (SS) 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 Narrow;font-size:8pt;">August 1, 2024</span>
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 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 the Fund’s operating expenses remain the same. The Example does not reflect sales charges (loads) on reinvested dividends. If these sales charges (loads) were included, your costs would be higher. 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 in a portfolio of U.S. Treasury securities maturing in 397 days or less and repurchase agreements collateralized fully by U.S. Treasury securities. The Fund may also hold cash.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 (“Rule 2a-7”).The Fund will operate as a “government money market fund,” as such term is defined in or interpreted under Rule 2a-7 under the Investment Company Act of 1940, as amended (the “1940 Act”). “Government money market funds” are required to invest at least 99.5% of their total assets in: (i) cash; (ii) securities issued or guaranteed by the United States or certain U.S. government agencies or instrumentalities; and/or (iii) repurchase agreements that are collateralized fully. Government money market funds are exempt from requirements that permit money market funds to impose a liquidity fee and/or temporary redemption gates.The Fund has not elected to be subject to the liquidity fees and gates requirement at this time.The Fund will invest its assets so that at least 80% of its net assets (plus any borrowings for investment purposes) are invested in U.S. Treasury 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 normally invest less than 80% of its net assets (plus any borrowings for investment purposes) in U.S. Treasury 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>
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 total returns shown below are for an existing class of shares, Institutional Shares (IS), offered by the Fund. The IS class is not offered in this Prospectus for the Fund’s Service Shares (SS). The total returns for the IS class are disclosed below because the SS class will not commence operations until on or about July 1, 2023. The total returns for the SS class would be substantially similar to the annual returns for the IS class over the same period because the classes are invested in the same portfolio of securities and would differ only to the extent the classes do not have the same expenses. It is anticipated that the expense ratio of the SS class will be higher than the expense ratio of the IS class; accordingly, the actual performance of the SS class is anticipated to be lower than the performance of the IS class.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 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 FederatedHermes.com/us 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 One Year or Less [Text] rr_PerformanceOneYearOrLess <span style="font-family:Times New Roman;font-size:10pt;">The IS class is not offered in this Prospectus for the Fund’s Service Shares (SS). The total returns for the IS class are disclosed below because the SS class will not commence operations until on or about July</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;"> 1, 2023.</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="font-family:Times New Roman;font-size:10pt;">FederatedHermes</span><span style="font-family:Times New Roman;font-size:10pt;">.com/us</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 Trust for U.S. Treasury Obligations – IS Class
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

The Fund's IS class total return for the three-month period from January 1, 2023 to March 31, 2023, was 1.08%.

Within the periods shown in the bar chart, the Fund's IS class highest quarterly return was 0.86% (quarter ended December 31, 2022). Its lowest quarterly return was 0.00% (quarter ended December 31, 2021).
Bar Chart, Returns for Class Not Offered in Prospectus [Text] rr_BarChartReturnsForClassNotOfferedInProspectus <span style="font-family:Times New Roman;font-size:10pt;margin-left:10pt;">The total returns shown below are for an existing class of shares, Institutional Shares (IS), offered by the Fund. </span><span style="font-family:Times New Roman;font-size:10pt;">The IS class is not offered in this Prospectus for the Fund’s Service Shares (SS). The total returns for the IS class are disclosed below because the SS class will not commence operations until on or about July</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;"> 1, 2023.</span><span style="font-family:Times New Roman;font-size:10pt;"> The total returns for the SS class </span><span style="font-family:Times New Roman;font-size:10pt;">would be substantially similar to the annual returns for the IS class over the same period because the classes are invested in the same portfolio of securities and would differ only to the extent the classes do not have the same expenses.</span>
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 IS class Average Annual Total Returns for the calendar period ended December 31, 2022.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock The Fund’s IS class 7-Day Net Yield as of December 31, 2022, was 4.13%. You may go to FederatedHermes.com/us 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 Narrow;font-size:7.75pt;font-style:italic;">The Fund’s IS class 7-Day Net Yield as of December 31, 2022</span>
Money Market Seven Day Yield Phone rr_MoneyMarketSevenDayYieldPhone <span style="font-family:Arial Narrow;font-size:7.75pt;font-style:italic;">1-800-341-7400</span>
Money Market Seven Day Yield rr_MoneyMarketSevenDayYield 4.13%
Fee Waiver Or Reimbursement Over Assets, Later Of Termination Or Next Effective Prospectus mmot_FeeWaiverOrReimbursementOverAssetsLaterOfTerminationOrNextEffectiveProspectus <span style="font-family:Arial Narrow;font-size:8pt;">up to but not </span><span style="font-family:Arial Narrow;font-size:8pt;">including the later of (the “Termination Date”): (a) </span><span style="font-family:Arial Narrow;font-size:8pt;">August 1, 2024</span><span style="font-family:Arial Narrow;font-size:8pt;">; or (b) the date of the Fund’s next effective Prospectus.</span>
Service Shares | Federated Hermes Trust for U S Treasury Obligations | Risk Lose Money [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.You could lose money by investing in the Fund.
Service Shares | Federated Hermes Trust for U S Treasury Obligations | Risk Money Market Fund May Not Preserve Dollar [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so.
Service Shares | Federated Hermes Trust for U S Treasury Obligations | Risk Money Market Fund Sponsor May Not Provide Support [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
Service Shares | Federated Hermes Trust for U S Treasury Obligations | Risk Not Insured [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Service Shares | Federated Hermes Trust for U S Treasury Obligations | Interest Rate Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock ◾ Interest Rate Risk. Prices of fixed-income 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.
Service Shares | Federated Hermes Trust for U S Treasury Obligations | Risk Related to the Economy [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock ◾ 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.
Service Shares | Federated Hermes Trust for U S Treasury Obligations | Counterparty Credit Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock ◾ 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.
Service Shares | Federated Hermes Trust for U S Treasury Obligations | Risk Associated with Investing Share Purchase Proceeds [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock ◾ 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 Fund holds cash, or if the yield of the securities purchased is less than that of the securities already in the portfolio, 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.
Service Shares | Federated Hermes Trust for U S Treasury Obligations | Risk Associated with Use of Amortized Cost [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock ◾ 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.
Service Shares | Federated Hermes Trust for U S Treasury Obligations | Additional Factors Affecting Yield [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock ◾ 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.
Service Shares | Federated Hermes Trust for U S Treasury Obligations | Technology Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock ◾ 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.
Service Shares | Federated Hermes Trust for U S Treasury Obligations | 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 0.20%
Distribution (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.35% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.55%
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 0.45%
1 Year rr_ExpenseExampleYear01 $ 56
3 Years rr_ExpenseExampleYear03 176
5 Years rr_ExpenseExampleYear05 307
10 Years rr_ExpenseExampleYear10 $ 689
Service Shares | Federated Hermes Trust for U S Treasury Obligations | IS  
Risk Return Abstract rr_RiskReturnAbstract  
2013 rr_AnnualReturn2013 none
2014 rr_AnnualReturn2014 none
2015 rr_AnnualReturn2015 none
2016 rr_AnnualReturn2016 0.21%
2017 rr_AnnualReturn2017 0.73%
2018 rr_AnnualReturn2018 1.70%
2019 rr_AnnualReturn2019 2.05%
2020 rr_AnnualReturn2020 0.34%
2021 rr_AnnualReturn2021 none
Annual Return 2022 rr_AnnualReturn2022 1.47%
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, 2023
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 1.08%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2022
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.86%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2021
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn none
1 Year rr_AverageAnnualReturnYear01 1.47%
5 Years rr_AverageAnnualReturnYear05 1.11%
10 Years rr_AverageAnnualReturnYear10 0.65%
[1] Other expenses are based on estimated amounts for the current fiscal year.
[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 SS class (after the voluntary waivers and/or reimbursements) will not exceed 0.45% (the “Fee Limit”) up to but not including the later of (the “Termination Date”): (a) August 1, 2024; 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.