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Regulatory Matters - Balancing and Memorandum Accounts (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Regulated Operations [Abstract]
Authorized revenue, threshold percentage	2.00%
Net under-collected accounts	$ 2,312

X

- Definition

Regulatory Balancing and Memorandum Accounts,, Net Under-Collected

+ References

No definition available.

+ Details

Name:	sjw_RegulatoryBalancingandMemorandumAccountsNetUnderCollected
Namespace Prefix:	sjw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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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- References

No definition available.

+ Details

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