v3.26.1
Shareholder Report
 12 Months Ended
May 31, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name Federated Hermes Money Market Obligations Trust
Entity Central Index Key 0000856517
Entity Investment Company Type N-1A
Document Period End Date May 31, 2026
Shareholder Report Annual or Semi-Annual Annual Shareholder Report
C000190788  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Tax-Free Obligations Fund
Class Name Advisor Shares
Trading Symbol TBVXX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Federated Hermes Tax-Free Obligations Fund (the "Fund") for the period of June 1, 2025 to May 31, 2026.
Additional Information [Text Block] You can find additional information at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1-800-341-7400, Option 4, or your financial advisor.
Additional Information Phone Number 1-800-341-7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Advisor Shares
$21
0.21%
Expenses Paid, Amount $ 21
Expense Ratio, Percent 0.21%
AssetsNet $ 6,205,844,507
Holdings Count | Holding 413
Advisory Fees Paid, Amount $ 7,049,802
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$6,205,844,507
  • Number of Investments413
  • Total Advisory Fees Paid$7,049,802
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
Commerical Paper
14.0%
Municipal Notes
19.3%
Variable Rate Demand Instruments
67.9%

Effective Maturity Schedule (% of Net Assets)

Group By Maturity Chart
Table Summary
Value
Value
181 Days or More
6.0%
91-180 Days
5.1%
31-90 Days
23.9%
8-30 Days
5.9%
1-7 Days
60.3%
Material Fund Change [Text Block]
C000026165  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Tax-Free Obligations Fund
Class Name Service Shares
Trading Symbol TBSXX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Federated Hermes Tax-Free Obligations Fund (the "Fund") for the period of June 1, 2025 to May 31, 2026.
Additional Information [Text Block] You can find additional information at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1-800-341-7400, Option 4, or your financial advisor.
Additional Information Phone Number 1-800-341-7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Service Shares
$47
0.46%
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.46%
AssetsNet $ 6,205,844,507
Holdings Count | Holding 413
Advisory Fees Paid, Amount $ 7,049,802
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$6,205,844,507
  • Number of Investments413
  • Total Advisory Fees Paid$7,049,802
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
Commerical Paper
14.0%
Municipal Notes
19.3%
Variable Rate Demand Instruments
67.9%

Effective Maturity Schedule (% of Net Assets)

Group By Maturity Chart
Table Summary
Value
Value
181 Days or More
6.0%
91-180 Days
5.1%
31-90 Days
23.9%
8-30 Days
5.9%
1-7 Days
60.3%
Material Fund Change [Text Block]
C000026164  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Tax-Free Obligations Fund
Class Name Wealth Shares
Trading Symbol TBIXX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Federated Hermes Tax-Free Obligations Fund (the "Fund") for the period of June 1, 2025 to May 31, 2026.
Additional Information [Text Block] You can find additional information at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1-800-341-7400, Option 4, or your financial advisor.
Additional Information Phone Number 1-800-341-7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Wealth Shares
$21
0.21%
Expenses Paid, Amount $ 21
Expense Ratio, Percent 0.21%
AssetsNet $ 6,205,844,507
Holdings Count | Holding 413
Advisory Fees Paid, Amount $ 7,049,802
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$6,205,844,507
  • Number of Investments413
  • Total Advisory Fees Paid$7,049,802
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
Commerical Paper
14.0%
Municipal Notes
19.3%
Variable Rate Demand Instruments
67.9%

Effective Maturity Schedule (% of Net Assets)

Group By Maturity Chart
Table Summary
Value
Value
181 Days or More
6.0%
91-180 Days
5.1%
31-90 Days
23.9%
8-30 Days
5.9%
1-7 Days
60.3%
Material Fund Change [Text Block]
C000157044  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Municipal Obligations Fund
Class Name Automated Shares
Trading Symbol MOTXX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Federated Hermes Municipal Obligations Fund (the "Fund") for the period of June 1, 2025 to May 31, 2026.
Additional Information [Text Block] You can find additional information at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1-800-341-7400, Option 4, or your financial advisor.
Additional Information Phone Number 1-800-341-7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Automated Shares
$51
0.50%
Expenses Paid, Amount $ 51
Expense Ratio, Percent 0.50%
AssetsNet $ 6,715,196,872
Holdings Count | Holding 495
Advisory Fees Paid, Amount $ 8,671,010
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$6,715,196,872
  • Number of Investments495
  • Total Advisory Fees Paid$8,671,010
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
Commerical Paper
6.8%
Municipal Notes
22.9%
Variable Rate Demand Instruments
70.7%

Effective Maturity Schedule (% of Net Assets)

Group By Maturity Chart
Table Summary
Value
Value
181 Days or More
6.3%
91-180 Days
4.0%
31-90 Days
24.4%
8-30 Days
4.5%
1-7 Days
61.2%
Material Fund Change [Text Block]
C000026110  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Municipal Obligations Fund
Class Name Capital Shares
Trading Symbol MFCXX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Federated Hermes Municipal Obligations Fund (the "Fund") for the period of June 1, 2025 to May 31, 2026.
Additional Information [Text Block] You can find additional information at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1-800-341-7400, Option 4, or your financial advisor.
Additional Information Phone Number 1-800-341-7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Capital Shares
$31
0.31%
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.31%
AssetsNet $ 6,715,196,872
Holdings Count | Holding 495
Advisory Fees Paid, Amount $ 8,671,010
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$6,715,196,872
  • Number of Investments495
  • Total Advisory Fees Paid$8,671,010
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
Commerical Paper
6.8%
Municipal Notes
22.9%
Variable Rate Demand Instruments
70.7%

Effective Maturity Schedule (% of Net Assets)

Group By Maturity Chart
Table Summary
Value
Value
181 Days or More
6.3%
91-180 Days
4.0%
31-90 Days
24.4%
8-30 Days
4.5%
1-7 Days
61.2%
Material Fund Change [Text Block]
C000157041  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Municipal Obligations Fund
Class Name Cash II Shares
Trading Symbol MODXX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Federated Hermes Municipal Obligations Fund (the "Fund") for the period of June 1, 2025 to May 31, 2026.
Additional Information [Text Block] You can find additional information at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1-800-341-7400, Option 4, or your financial advisor.
Additional Information Phone Number 1-800-341-7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Cash II Shares
$92
0.91%
Expenses Paid, Amount $ 92
Expense Ratio, Percent 0.91%
AssetsNet $ 6,715,196,872
Holdings Count | Holding 495
Advisory Fees Paid, Amount $ 8,671,010
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$6,715,196,872
  • Number of Investments495
  • Total Advisory Fees Paid$8,671,010
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
Commerical Paper
6.8%
Municipal Notes
22.9%
Variable Rate Demand Instruments
70.7%

Effective Maturity Schedule (% of Net Assets)

Group By Maturity Chart
Table Summary
Value
Value
181 Days or More
6.3%
91-180 Days
4.0%
31-90 Days
24.4%
8-30 Days
4.5%
1-7 Days
61.2%
Material Fund Change [Text Block]
C000157042  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Municipal Obligations Fund
Class Name Cash Series Shares
Trading Symbol MFSXX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Federated Hermes Municipal Obligations Fund (the "Fund") for the period of June 1, 2025 to May 31, 2026.
Additional Information [Text Block] You can find additional information at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1-800-341-7400, Option 4, or your financial advisor.
Additional Information Phone Number 1-800-341-7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Cash Series Shares
$103
1.02%
Expenses Paid, Amount $ 103
Expense Ratio, Percent 1.02%
AssetsNet $ 6,715,196,872
Holdings Count | Holding 495
Advisory Fees Paid, Amount $ 8,671,010
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$6,715,196,872
  • Number of Investments495
  • Total Advisory Fees Paid$8,671,010
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
Commerical Paper
6.8%
Municipal Notes
22.9%
Variable Rate Demand Instruments
70.7%

Effective Maturity Schedule (% of Net Assets)

Group By Maturity Chart
Table Summary
Value
Value
181 Days or More
6.3%
91-180 Days
4.0%
31-90 Days
24.4%
8-30 Days
4.5%
1-7 Days
61.2%
Material Fund Change [Text Block]
C000157043  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Municipal Obligations Fund
Class Name Investment Shares
Trading Symbol MOIXX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Federated Hermes Municipal Obligations Fund (the "Fund") for the period of June 1, 2025 to May 31, 2026.
Additional Information [Text Block] You can find additional information at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1-800-341-7400, Option 4, or your financial advisor.
Additional Information Phone Number 1-800-341-7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Investment Shares
$73
0.72%
Expenses Paid, Amount $ 73
Expense Ratio, Percent 0.72%
AssetsNet $ 6,715,196,872
Holdings Count | Holding 495
Advisory Fees Paid, Amount $ 8,671,010
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$6,715,196,872
  • Number of Investments495
  • Total Advisory Fees Paid$8,671,010
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
Commerical Paper
6.8%
Municipal Notes
22.9%
Variable Rate Demand Instruments
70.7%

Effective Maturity Schedule (% of Net Assets)

Group By Maturity Chart
Table Summary
Value
Value
181 Days or More
6.3%
91-180 Days
4.0%
31-90 Days
24.4%
8-30 Days
4.5%
1-7 Days
61.2%
Material Fund Change [Text Block]
C000026109  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Municipal Obligations Fund
Class Name Service Shares
Trading Symbol MOSXX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Federated Hermes Municipal Obligations Fund (the "Fund") for the period of June 1, 2025 to May 31, 2026.
Additional Information [Text Block] You can find additional information at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1-800-341-7400, Option 4, or your financial advisor.
Additional Information Phone Number 1-800-341-7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Service Shares
$47
0.46%
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.46%
AssetsNet $ 6,715,196,872
Holdings Count | Holding 495
Advisory Fees Paid, Amount $ 8,671,010
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$6,715,196,872
  • Number of Investments495
  • Total Advisory Fees Paid$8,671,010
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
Commerical Paper
6.8%
Municipal Notes
22.9%
Variable Rate Demand Instruments
70.7%

Effective Maturity Schedule (% of Net Assets)

Group By Maturity Chart
Table Summary
Value
Value
181 Days or More
6.3%
91-180 Days
4.0%
31-90 Days
24.4%
8-30 Days
4.5%
1-7 Days
61.2%
Material Fund Change [Text Block]
C000026108  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Municipal Obligations Fund
Class Name Wealth Shares
Trading Symbol MOFXX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Federated Hermes Municipal Obligations Fund (the "Fund") for the period of June 1, 2025 to May 31, 2026.
Additional Information [Text Block] You can find additional information at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1-800-341-7400, Option 4, or your financial advisor.
Additional Information Phone Number 1-800-341-7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]

What were the Fund costs for the last year?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Wealth Shares
$21
0.21%
Expenses Paid, Amount $ 21
Expense Ratio, Percent 0.21%
AssetsNet $ 6,715,196,872
Holdings Count | Holding 495
Advisory Fees Paid, Amount $ 8,671,010
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$6,715,196,872
  • Number of Investments495
  • Total Advisory Fees Paid$8,671,010
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
Commerical Paper
6.8%
Municipal Notes
22.9%
Variable Rate Demand Instruments
70.7%

Effective Maturity Schedule (% of Net Assets)

Group By Maturity Chart
Table Summary
Value
Value
181 Days or More
6.3%
91-180 Days
4.0%
31-90 Days
24.4%
8-30 Days
4.5%
1-7 Days
61.2%
Material Fund Change [Text Block]