Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	FEDERATED HERMES MONEY MARKET OBLIGATIONS TRUST
Prospectus Date	rr_ProspectusDate	Sep. 30, 2023
Federated Hermes Capital Reserves 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 Capital Reserves 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 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 consistent with stability of principal and liquidity.
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 Shares 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;">October 1, </span><span style="font-family:Arial Narrow;font-size:8pt;">2024</span>
Expense Footnotes [Text Block]	rr_ExpenseFootnotesTextBlock	To the extent the Fund invests its assets in an affiliated fund pursuant to Rule 12d1-1 under the Investment Company Act of 1940, as amended (“1940 Act”), the fees and expenses shown in the table above and the Example that follows include fees and expenses of the underlying affiliated fund. The underlying affiliated fund may, in turn, invest all or substantially all of its assets in another affiliated fund. The Fund’s proportional share of the fees and expenses of the affiliated funds (including management fees) is reflected in the table above, if applicable, as Acquired Fund Fees and Expenses. Therefore, in order to comply with the Fee Limit and in order to avoid charging duplicative fees, as applicable, the Adviser will waive and/or reimburse the Fund’s Management Fee with respect to the amount of its net assets invested in the affiliated fund as required by Rule 12d1-1.
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 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 primarily in a portfolio of high-quality, dollar-denominated, fixed-income securities which: (1) are issued by banks and corporations in the U.S. and other countries and the U.S. government; and (2) mature in 397 days 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”). The Fund may invest in government securities that are issued by entities whose activities are sponsored by the federal government but that have no explicit financial support. Finally, as an efficient and cost-effective means of implementing its investment strategy and/or managing cash, the Fund may also invest in affiliated money market funds, including up to 25% of its net assets in affiliated institutional prime money market funds with a “floating” net asset value.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”).
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 bar chart and performance table shown 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 Shares total returns on a calendar year-by-year basis. The Average Annual Total Return Table shows returns averaged over 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 the Fund at 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 shown below reflect historical performance data for the Fund and are intended to </span><span style="font-family:Times New Roman;font-size:10pt;">help you analyze the Fund’s investment risks in light of its historical returns. The bar chart shows the variability of the Fund’s Shares 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="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 Capital Reserves Fund
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	The Fund’s total return for the six-month period from January 1, 2023 to June 30, 2023, was 2.03%.Within the periods shown in the bar chart, the Fund’s highest quarterly return was 0.75% (quarter ended December 31, 2022). Its lowest quarterly return was 0.00% (quarter ended March 31, 2022).
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 Shares Average Annual Total Returns for the calendar period ended December 31, 2022.
Performance Table Closing [Text Block]	rr_PerformanceTableClosingTextBlock	The Fund’s 7-Day Net Yield as of December 31, 2022, was 3.61%. 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 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	3.61%
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 including the later of (the “Termination Date”): </span><span style="font-family:Arial Narrow;font-size:8pt;">(a) </span><span style="font-family:Arial Narrow;font-size:8pt;">October 1, </span><span style="font-family:Arial Narrow;font-size:8pt;">2024</span><span style="font-family:Arial Narrow;font-size:8pt;">; or (b) the date of the Fund’s next effective Prospectus.</span>
Federated Hermes Capital Reserves Fund | 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.
Federated Hermes Capital Reserves Fund | Risk Money Market Fund May Impose Fees or Suspend Sales [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	The Fund may impose a fee upon sale of your shares.
Federated Hermes Capital Reserves Fund | 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.
Federated Hermes Capital Reserves Fund | Risk Money Market Fund Sponsor May Not Provide Support [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	The Fund’s sponsor is not required to reimburse the Fund for losses, and you should not expect that the sponsor will provide financial support to the Fund at any time, including during periods of market stress.
Federated Hermes Capital Reserves Fund | Risk Not Insured [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	An investment in the Fund is not a bank account and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Federated Hermes Capital Reserves Fund | Issuer Credit Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	◾ 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.
Federated Hermes Capital Reserves Fund | 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.
Federated Hermes Capital Reserves Fund | 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.
Federated Hermes Capital Reserves Fund | 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.
Federated Hermes Capital Reserves Fund | Liquidity Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	◾ 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.
Federated Hermes Capital Reserves Fund | Call Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	◾ 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.
Federated Hermes Capital Reserves Fund | Credit Enhancement Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	◾ 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.
Federated Hermes Capital Reserves Fund | Risk of Foreign Investing [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	◾ Risk of Foreign Investing. Because the Fund invests in securities issued by foreign companies, the Fund may be more affected by foreign economic and political conditions, taxation policies and accounting and auditing standards than would otherwise be the case.
Federated Hermes Capital Reserves Fund | Prepayment and Extension Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	◾ Prepayment and Extension Risk. The Fund may invest in asset-backed and mortgage-backed securities, which may be subject to prepayment risk. If interest rates fall, and unscheduled prepayments on such securities accelerate, the Fund will be required to reinvest the proceeds at the lower interest rates then 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.
Federated Hermes Capital Reserves Fund | 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.
Federated Hermes Capital Reserves Fund | 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.
Federated Hermes Capital Reserves Fund | 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.
Federated Hermes Capital Reserves Fund | Liquidity Fees Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	◾ Liquidity Fees Risk. Pursuant to rules adopted by the SEC in July 2023, the Fund will be able to impose discretionary liquidity fees on redemptions subject to a determination by the Fund’s Board that such a liquidity fee is in the Fund’s best interests. If the Fund’s Board, including a majority of the independent Trustees, determines that imposing a liquidity fee is in the Fund’s best interests, the Fund may impose discretionary liquidity fees of up to 2% of the value of the shares redeemed. The Fund may invest in other money market funds that are also subject to the imposition of liquidity fees. As a result, although not required, in the event that liquidity fees are imposed by a money market fund in which the Fund invests, the Fund’s Board may separately impose corresponding liquidity fees on the Fund.
Federated Hermes Capital Reserves Fund | Underlying Fund Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	◾ Underlying Fund Risk. The risk that the Fund’s performance is closely related to the risks associated with the securities and other investments held by the Underlying Fund and that the ability of the Fund to achieve its investment objective will depend upon the ability of the Underlying Fund to achieve its investment objectives. The Fund bears Underlying Fund fees and expenses indirectly. However, to avoid charging duplicative fees, the Adviser will waive and/or reimburse the Fund’s Management Fee with respect to the amount of its net assets invested in the affiliated fund as required by Rule 12d1-1.
Federated Hermes Capital Reserves Fund | 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.
Federated Hermes Capital Reserves Fund | Federated Hermes Capital Reserves Fund
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	0.15%	[1]
Distribution (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	0.55%
Other Expenses	rr_OtherExpensesOverAssets	0.46%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.16%	[1]
Fee Waivers and/or Expense Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.14%)	[1],[2]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	rr_NetExpensesOverAssets	1.02%
1 Year	rr_ExpenseExampleYear01	$ 118
3 Years	rr_ExpenseExampleYear03	368
5 Years	rr_ExpenseExampleYear05	638
10 Years	rr_ExpenseExampleYear10	$ 1,409
2013	rr_AnnualReturn2013	none
2014	rr_AnnualReturn2014	none
2015	rr_AnnualReturn2015	none
2016	rr_AnnualReturn2016	none
2017	rr_AnnualReturn2017	0.28%
2018	rr_AnnualReturn2018	1.17%
2019	rr_AnnualReturn2019	1.46%
2020	rr_AnnualReturn2020	0.20%
2021	rr_AnnualReturn2021	0.01%
Annual Return 2022	rr_AnnualReturn2022	1.13%
Year to Date Return, Label	rr_YearToDateReturnLabel	The Fund's total return for the six-month period
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2023
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	2.03%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	highest quarterly return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Dec. 31, 2022
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	0.75%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	lowest quarterly return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2022
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	none
1 Year	rr_AverageAnnualReturnYear01	1.13%
5 Years	rr_AverageAnnualReturnYear05	0.79%
10 Years	rr_AverageAnnualReturnYear10	0.42%

[1] The Management Fee, Total Annual Fund Operating Expenses and Fee Waivers and/or Expense Reimbursements have been restated to reflect current fees due to a reduction in the stated gross Management Fee for the Fund effective October 1, 2023.

[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. The total annual fund operating expenses (excluding interest expense, extraordinary expenses and proxy-related expenses, if any) paid by the Fund (after the voluntary waivers and/or reimbursements) will not exceed 1.02% (the “Fee Limit”), up to but not including the later of (the “Termination Date”): (a) October 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 Fund’s Board of Trustees.