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General - Schedule of SJW Group's Revenue Components (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Accounting Policies [Abstract]
Revenue from contracts with customers	$ 173,106	$ 159,724	$ 323,114	$ 295,560
Alternative revenue programs, net	1,314	(2,204)	(523)	(3,595)
Other balancing and memorandum accounts and regulatory mechanisms, net	977	(2,050)	413	(646)
Rental income	777	1,416	2,552	2,863
Operating revenue	$ 176,174	$ 156,886	$ 325,556	$ 294,182

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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