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Regulatory Matters - Balancing and Memorandum Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 11, 2022	Dec. 31, 2022	Dec. 31, 2021
Regulated Operations [Abstract]
Authorized revenue, threshold percentage		2.00%
Net under-collected accounts		$ 655
Refunds (Collections) Adjustments	$ 18,174	$ (22,494)	$ (371)

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- Definition

Balancing and Memorandum Revenue Account, Refunds (Collections)

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No definition available.

+ Details

Name:	sjw_BalancingandMemorandumRevenueAccountRefundsCollections
Namespace Prefix:	sjw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Regulatory Balancing and Memorandum Accounts,, Net Under-Collected

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No definition available.

+ Details

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

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- Definition

Threshold balance of regulatory balancing or memorandum accounts as a percentage of authorized revenue to trigger an account review.

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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