XML 62 R41.htm IDEA: XBRL DOCUMENT v3.25.0.1

Organization and Operations (Details)	12 Months Ended
	Dec. 31, 2024 subsidiary entity
Public Utilities, General Disclosures [Line Items]
Number of variable interest entities | entity	1
SJWC
Public Utilities, General Disclosures [Line Items]
Number of subsidiaries that are primary beneficiaries | subsidiary	1
Variable Interest Entity, Not Primary Beneficiary
Public Utilities, General Disclosures [Line Items]
Ownership percentage in acequia water supply corporation	25.00%

X

- Definition

Variable Interest Entities, Number Of Entities

+ References

No definition available.

+ Details

Name:	sjw_VariableInterestEntitiesNumberOfEntities
Namespace Prefix:	sjw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Variable Interest Entity, Primary Beneficiary, Number Of Subsidiaries

+ References

No definition available.

+ Details

Name:	sjw_VariableInterestEntityPrimaryBeneficiaryNumberOfSubsidiaries
Namespace Prefix:	sjw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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

X

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-5A

+ Details

Name:	us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_ConsolidatedEntitiesAxis=sjw_SanJoseWaterCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: