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Benefit Plans - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items] |  |
Employer plan contributions | $ 2,258 | $ 4,516
CTWS Employees |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Rate of compensation increase |  | 1.50%

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- Definition Defined Benefit Plan, Rate Of Compensation Increase + References No definition available. + Details
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Namespace Prefix: | sjw_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | srt_TitleOfIndividualAxis=sjw_CTWSEmployeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |