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Subsequent Events (Details) - Chase Bank, N.A. [Member] - Line of Credit [Member] - USD ($) $ in Thousands | May 11, 2020 | Apr. 29, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Revolving Credit Facility [Member] | San Jose Water Company [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 125,000
Revolving Credit Facility [Member] | San Jose Water Company [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 140,000 |  |
Line of Credit Facility, Increase in Maximum Borrowing Capacity | 15,000 |  |
Revolving Credit Facility [Member] | SJW Corp. and SJW Land Company [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 15,000
Revolving Credit Facility [Member] | SJW Corp. and SJW Land Company [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 0 |
Revolving Credit Facility - Temporary [Member] | San Jose Water Company [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 50,000 |  |

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- Definition Line of Credit Facility, Increase in Maximum Borrowing Capacity + References No definition available. + Details
Name: | sjw_LineofCreditFacilityIncreaseinMaximumBorrowingCapacity
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=sjw_ChaseBankN.A.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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- Details
Name: | srt_ConsolidatedEntitiesAxis=sjw_SJWCorp.andSJWLandCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=sjw_RevolvingCreditFacilityTemporaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |