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Subsequent Events	9 Months Ended
	Sep. 30, 2021
Statement of Financial Position [Abstract]
Subsequent Events	Subsequent EventsOn October 29, 2021, San Jose Water sold two non-utility properties located in San Jose, California for $13,150. Also, on the same date, SJW Land sold undeveloped land located in San Jose, California for $2,600. SJW Group will record an estimated pre-tax gain on the sale of real estate investments of $13,600 in the fourth quarter of 2021.

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- References

No definition available.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

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