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Regulatory Matters - Balancing and Memorandum Accounts (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Oct. 11, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Regulatory Assets [Line Items]
Refunds (Collections) Adjustments		$ (8,708)	$ 0	$ (26,101)	$ 6
Authorized revenue, threshold percentage		2.00%		2.00%
Subsequent Event
Regulatory Assets [Line Items]
Refunds (Collections) Adjustments	$ 18,174

X

- Definition

Balancing and Memorandum Revenue Account, Refunds (Collections)

+ References

No definition available.

+ Details

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

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

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Namespace Prefix:	sjw_
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Balance Type:	na
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

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

X

- Details

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Balance Type:
Period Type: