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General - Schedule of SJW Group's Revenue Components (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Accounting Policies [Abstract]
Revenue from contracts with customers	$ 164,863	$ 150,008
Alternative revenue programs, net	592	(1,837)
Other balancing and memorandum accounts and regulatory mechanisms, net	1,300	(564)
Rental income	844	1,775
Operating revenue	$ 167,599	$ 149,382

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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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