XML 102 R87.htm IDEA: XBRL DOCUMENT v3.25.0.1

Retirement Plans - Schedule of Plan Assets Fair Value Hierarchy (Details) - USD ($) $ in Thousands		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 5,200	$ 5,100
United Kingdom Subsidiary | UK Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		203,617	223,077	$ 210,284
United Kingdom Subsidiary | UK Plan | Total plan assets in fair value hierarchy
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		104,628	117,235
United Kingdom Subsidiary | UK Plan | Total plan assets in fair value hierarchy | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		15,697	8,797
United Kingdom Subsidiary | UK Plan | Total plan assets in fair value hierarchy | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		88,931	108,438
United Kingdom Subsidiary | UK Plan | Total plan assets in fair value hierarchy | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
United Kingdom Subsidiary | UK Plan | Corporate debt funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		39,972	44,504
United Kingdom Subsidiary | UK Plan | Corporate debt funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
United Kingdom Subsidiary | UK Plan | Corporate debt funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		39,972	44,504
United Kingdom Subsidiary | UK Plan | Corporate debt funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
United Kingdom Subsidiary | UK Plan | Government bond funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		48,959	63,934
United Kingdom Subsidiary | UK Plan | Government bond funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
United Kingdom Subsidiary | UK Plan | Government bond funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		48,959	63,934
United Kingdom Subsidiary | UK Plan | Government bond funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
United Kingdom Subsidiary | UK Plan | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		15,697	8,797
United Kingdom Subsidiary | UK Plan | Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		15,697	8,797
United Kingdom Subsidiary | UK Plan | Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
United Kingdom Subsidiary | UK Plan | Cash and cash equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
United Kingdom Subsidiary | UK Plan | Debt funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	$ 79,152	$ 85,786
Fair value of plan assets by hierarchy and NAV [Extensible Enumeration]		Fair Value Measured at Net Asset Value Per Share [Member]	Fair Value Measured at Net Asset Value Per Share [Member]
United Kingdom Subsidiary | UK Plan | Real estate funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	[1]	$ 19,837	$ 20,056
Fair value of plan assets by hierarchy and NAV [Extensible Enumeration]		Fair Value Measured at Net Asset Value Per Share [Member]	Fair Value Measured at Net Asset Value Per Share [Member]
[1] Certain investments measured using net asset value (“NAV”) as a practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the total fair value of plan assets. NAV is determined by the respective fund manager based on the fair value of the underlying assets held by the fund, less its liabilities, divided by the number of units outstanding.

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

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(02)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

Name:	us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Indicates level within fair value hierarchy and fair value measured at net asset value per share as practical expedient, of defined benefit plan asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(03)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

Name:	us-gaap_DefinedBenefitPlanPlanAssetsFairValueByHierarchyAndNavExtensibleList
Namespace Prefix:	us-gaap_
Data Type:	enum2:enumerationSetItemType
Balance Type:	na
Period Type:	instant

X

- Details

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

X

- Details

Name:	us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=eme_TotalPlanAssetsinFairValueHierarchyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=eme_CorporateDebtFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=eme_GovernmentBondFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashAndCashEquivalentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=eme_DebtFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_RealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: