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Benefit Plans - Regulatory Asset (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Defined Benefit Plan Disclosure [Line Items] |  |
Total regulatory assets, net | $ 154,621 | $ 158,230
Postretirement pensions and other medical benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Funded status of obligation | 86,307 | 124,282
Accrued benefit cost | (24,110) | (29,920)
Total regulatory assets, net | $ 62,197 | $ 94,362

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- Definition Regulatory Assets, Funded Status of Obligation + References No definition available. + Details
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Balance Type: | debit
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- Definition Regulatory Liabilities, Accrued Benefit Cost + References No definition available. + Details
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Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
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Namespace Prefix: | us-gaap_
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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |