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Retirement Plans (Narrative) (Details)	Sep. 30, 2024 plan
United States Subsidiaries
Defined Benefit Plan Disclosure [Line Items]
Number of plans	3

X

- Definition

Defined Benefit Plan, Number Of Plans

+ References

No definition available.

+ Details

Name:	eme_DefinedBenefitPlanNumberOfPlans
Namespace Prefix:	eme_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=eme_UnitedStatesSubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: