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General - Schedule of SJW Group's Revenue Components (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accounting Policies [Abstract]
Revenue from contracts with customers	$ 150,008	$ 135,836
Alternative revenue programs, net	(1,837)	(1,391)
Other balancing and memorandum accounts and regulatory mechanisms, net	(564)	1,404
Rental income	1,775	1,447
Operating revenue	$ 149,382	$ 137,296

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Regulatory Balancing And Memorandum Accounts And Regulatory Mechanisms, Net

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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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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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