XML 53 R42.htm IDEA: XBRL DOCUMENT v3.19.2

Legal Proceedings Narrative (Details) - USD ($) $ in Thousands	Jul. 26, 2019	Feb. 08, 2019
Advice Letter No. 530 [Member]
Loss Contingencies [Line Items]
Approved Service Charge Refund		$ 2,020
Subsequent Event [Member] | OII No. 18-09-003 Settlement Agreement [Member]
Loss Contingencies [Line Items]
Customer Credit Refund	$ 350
Utility Plant Investment Commitment	5,000
Maximum | Subsequent Event [Member] | OII No. 18-09-003 Settlement Agreement [Member]
Loss Contingencies [Line Items]
Customer Credit Refund	2,100
Minimum | Subsequent Event [Member] | OII No. 18-09-003 Settlement Agreement [Member]
Loss Contingencies [Line Items]
Customer Credit Refund	$ 1,757

X

- Definition

Approved Service Charge Refund

+ References

No definition available.

+ Details

Name:	sjw_ApprovedServiceChargeRefund
Namespace Prefix:	sjw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Customer Credit Refund

+ References

No definition available.

+ Details

Name:	sjw_CustomerCreditRefund
Namespace Prefix:	sjw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Utility Plant Investment Commitment

+ References

No definition available.

+ Details

Name:	sjw_UtilityPlantInvestmentCommitment
Namespace Prefix:	sjw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

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

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=sjw_OIINo.1809003SettlementAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: