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v3.24.3

Commitment and Contingencies (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2024
Other Commitments [Line Items] |  |
Service agreement, term of contract | 12 years |
Service agreement, renewal term | 8 years |
Annual investment rent | $ 1,800 |
Forecast |  |
Other Commitments [Line Items] |  |
Upfront concession fee |  | $ 22,100

X
- Definition Service Agreement, Annual Rent Expense + References No definition available. + Details
Name: | sjw_ServiceAgreementAnnualRentExpense
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Service Agreement, Renewal Term + References No definition available. + Details
Name: | sjw_ServiceAgreementRenewalTerm
Namespace Prefix: | sjw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Service Agreement, Term of Contract + References No definition available. + Details
Name: | sjw_ServiceAgreementTermOfContract
Namespace Prefix: | sjw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Service Agreement, Upfront Concession Fee + References No definition available. + Details
Name: | sjw_ServiceAgreementUpfrontConcessionFee
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |