Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Period End Date	dei_DocumentPeriodEndDate	Jul. 31, 2023
Registrant Name	dei_EntityRegistrantName	FEDERATED HERMES MONEY MARKET OBLIGATIONS TRUST
CIK	dei_EntityCentralIndexKey	0000856517
Amendment Flag	dei_AmendmentFlag	false
Document Created Date	dei_DocumentCreationDate	Sep. 26, 2023
Effective Date	dei_DocumentEffectiveDate	Sep. 28, 2023
Prospectus Date	rr_ProspectusDate	Sep. 30, 2023
Entity Inv Company Type	dei_EntityInvCompanyType	N-1A
Federated Hermes Capital Reserves Fund \| Federated Hermes Capital Reserves Fund
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	FRFXX
Federated Hermes Government Reserves Fund \| C
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GRCXX
Federated Hermes Government Reserves Fund \| F
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GRGXX
Federated Hermes Government Reserves Fund \| A
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GRAXX
Federated Hermes Government Reserves Fund \| P
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GRFXX
Federated Hermes Government Obligations Fund \| SEL
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GRTXX
Federated Hermes Government Obligations Fund \| IS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GOIXX
Federated Hermes Government Obligations Fund \| SS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GOSXX
Federated Hermes Government Obligations Fund \| ADM
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GOEXX
Federated Hermes Government Obligations Fund \| CII
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GFYXX
Federated Hermes Government Obligations Fund \| CS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GFSXX
Federated Hermes Government Obligations Fund \| CAP
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GOCXX
Federated Hermes Government Obligations Fund \| TR
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GORXX
Federated Hermes Government Obligations Fund \| PRM
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GOFXX
Federated Hermes Government Obligations Fund \| AVR
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GOVXX
Federated Hermes Government Obligations Fund \| SDG
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GPHXX
Federated Hermes Government Obligations Tax-Managed Fund \| AS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GOAXX
Federated Hermes Government Obligations Tax-Managed Fund \| IS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GOTXX
Federated Hermes Government Obligations Tax-Managed Fund \| SS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	GTSXX
Federated Hermes Institutional Money Market Management \| IS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MMPXX
Federated Hermes Institutional Money Market Management \| SS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MMSXX
Federated Hermes Institutional Money Market Management \| CAP
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MMLXX
Federated Hermes Institutional Money Market Management \| EAG
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MMMXX
Federated Hermes Prime Cash Obligations Fund \| AS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PTAXX
Federated Hermes Prime Cash Obligations Fund \| R
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PTRXX
Federated Hermes Prime Cash Obligations Fund \| WS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PCOXX
Federated Hermes Prime Cash Obligations Fund \| AVR
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PCVXX
Federated Hermes Prime Cash Obligations Fund \| SS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PRCXX
Federated Hermes Prime Cash Obligations Fund \| CII
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PCDXX
Federated Hermes Prime Cash Obligations Fund \| CS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PTSXX
Federated Hermes Prime Cash Obligations Fund \| CAP
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PCCXX
Federated Hermes Prime Cash Obligations Fund \| TR
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PTTXX
Federated Hermes Institutional Prime Obligations Fund \| IS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	POIXX
Federated Hermes Institutional Prime Obligations Fund \| SS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PRSXX
Federated Hermes Institutional Prime Value Obligations Fund \| IS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PVOXX
Federated Hermes Institutional Prime Value Obligations Fund \| SS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PVSXX
Federated Hermes Institutional Prime Value Obligations Fund \| CAP
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	PVCXX
Federated Hermes Treasury Obligations Fund \| SEL
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	TOLXX
Federated Hermes Treasury Obligations Fund \| IS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	TOIXX
Federated Hermes Treasury Obligations Fund \| AS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	TOAXX
Federated Hermes Treasury Obligations Fund \| AVR
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	TOVXX
Federated Hermes Treasury Obligations Fund \| SS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	TOSXX
Federated Hermes Treasury Obligations Fund \| ADM
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	TODXX
Federated Hermes Treasury Obligations Fund \| CMS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	TOMXX
Federated Hermes Treasury Obligations Fund \| CAP
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	TOCXX
Federated Hermes Treasury Obligations Fund \| TR
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	TOTXX
Federated Hermes Treasury Obligations Fund \| PRM
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	TOPXX
Federated Hermes Trust for U S Treasury Obligations \| IS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	TTOXX
Federated Hermes Trust for U S Treasury Obligations \| SS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	TTQXX
Federated Hermes Trust for U S Treasury Obligations \| CII
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	TTIXX
Federated Hermes Trust for U S Treasury Obligations \| CS
Risk Return Abstract	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	TCSXX

Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

No definition available.

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- Definition

The date the document was made available and submitted, in YYYY-MM-DD format. The date of submission, date of acceptance by the recipient, and the document effective date are all potentially different.

+ References

No definition available.

+ Details

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- Definition

The date when a document, upon receipt and acceptance, becomes officially effective, in YYYY-MM-DD format. Usually it is a system-assigned date time value, but it may be declared by the submitter in some cases.

+ References

No definition available.

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- Definition

For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

+ References

No definition available.

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- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

+ References

No definition available.

+ Details

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Data Type:	dei:submissionTypeItemType
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- Definition

A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2

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- Definition

One of: N-1A (Mutual Fund), N-1 (Open-End Separate Account with No Variable Annuities), N-2 (Closed-End Investment Company), N-3 (Separate Account Registered as Open-End Management Investment Company), N-4 (Variable Annuity UIT Separate Account), N-5 (Small Business Investment Company), N-6 (Variable Life UIT Separate Account), S-1 or S-3 (Face Amount Certificate Company), S-6 (UIT, Non-Insurance Product).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-T
-Number 232
-Section 313

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Namespace Prefix:	dei_
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- Definition

The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2

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- Definition

Trading symbol of an instrument as listed on an exchange.

+ References

No definition available.

+ Details

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- Definition

The date of the prospectus.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 1
-Subsection a
-Paragraph 3

+ Details

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Namespace Prefix:	rr_
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- References

No definition available.

+ Details

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