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Contingencies Narrative (Details) $ in Thousands	Feb. 08, 2019 USD ($)
Subsequent Event [Member] | Advice Letter No. 530 [Member]
Loss Contingencies [Line Items]
Approved Service Charge Refund	$ (2,020)

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- Definition

Approved Service Charge Refund

+ 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_
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:

X

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=sjw_AdviceLetterNo.530Member
Namespace Prefix:
Data Type:	na
Balance Type:
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