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Lines of Credit - Narrative (Details) - USD ($)		12 Months Ended
	Apr. 23, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Line of Credit Facility [Line Items]
Repayments of Lines of Credit		$ 208,722,000	$ 218,289,000	$ 192,055,000
Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 260,000,000
Revolving Credit Facility | Line of Credit | SJW Group
Line of Credit Facility [Line Items]
Line of credit cost of borrowing rate		1.32%	1.78%
Revolving Credit Facility | Chase Bank, N.A. | Line of Credit | SJWC | SJWC Credit Agreement
Line of Credit Facility [Line Items]
Repayments of Lines of Credit	$ 140,000,000
Line of credit facility, maximum borrowing capacity	140,000,000
Revolving Credit Facility | Chase Bank, N.A. | Line of Credit | SJW Group and CLWSC | SJWTX Credit Agreement
Line of Credit Facility [Line Items]
Repayments of Lines of Credit	5,000,000
Revolving Credit Facility | Chase Bank, N.A. | Line of Credit | SJW Corp. and SJWTX, Inc. | SJWTX Credit Agreement
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	5,000,000
Standby Letters of Credit | Chase Bank, N.A. | Line of Credit | SJWC | SJWC Credit Agreement
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	15,000,000
Standby Letters of Credit | Chase Bank, N.A. | Line of Credit | SJW Corp. and SJWTX, Inc. | SJWTX Credit Agreement
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,000,000

X

- Definition

The effective interest rate at the end of the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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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.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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X

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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