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Regulatory Matters - Balancing and Memorandum Accounts (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 11, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Regulatory Assets [Line Items] |  |  |  |  |
Refunds (Collections) Adjustments |  | $ (8,708) | $ 0 | $ (26,101) | $ 6
Authorized revenue, threshold percentage |  | 2.00% |  | 2.00% |
Subsequent Event |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |
Refunds (Collections) Adjustments | $ 18,174 |  |  |  |

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- Definition Balancing and Memorandum Revenue Account, Refunds (Collections) + References No definition available. + Details
Name: | sjw_BalancingandMemorandumRevenueAccountRefundsCollections
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Threshold balance of regulatory balancing or memorandum accounts as a percentage of authorized revenue to trigger an account review. + References No definition available. + Details
Name: | sjw_RegulatoryBalancingandMemorandumAccountsReviewAuthorizedRevenueThresholdPercentage
Namespace Prefix: | sjw_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |