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Bank Borrowings and Long-Term Liabilities (Details) - USD ($)			6 Months Ended
	May 13, 2021	Apr. 23, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 25, 2021	Mar. 02, 2021
Debt Instrument [Line Items]
Repayments of lines of credit			$ 82,222,000	$ 59,734,000
Line of Credit | Revolving Credit Facility | Chase Bank, N.A. | San Jose Water Company
Debt Instrument [Line Items]
Repayments of lines of credit		$ 140,000,000
Line of Credit | Revolving Credit Facility | Chase Bank, N.A. | San Jose Water Company | SJWC Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		140,000,000
Line of Credit | Revolving Credit Facility | Chase Bank, N.A. | SJW Group and CLWSC | SJWTX Credit Agreement
Debt Instrument [Line Items]
Repayments of lines of credit		5,000,000
Line of credit facility, maximum borrowing capacity		5,000,000
Line of Credit | Letter of Credit Sublimit | Chase Bank, N.A. | San Jose Water Company | SJWC Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		15,000,000
Line of Credit | Letter of Credit Sublimit | Chase Bank, N.A. | SJW Group and CLWSC | SJWTX Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 1,000,000
Notes Payable to Banks | 3.89% Note Due March 2041 | Maine Water Company
Debt Instrument [Line Items]
Aggregate principal amount						$ 17,000,000
Interest Rate						3.89%
Notes Payable to Banks | 4.01% Note Due March 2041 | CLWSC
Debt Instrument [Line Items]
Interest Rate	4.01%
Proceeds from issuance of unsecured debt	$ 20,000,000
Notes Payable to Banks | 4.01% Note Due March 2041 | CLWSC | Maximum
Debt Instrument [Line Items]
Aggregate principal amount	$ 30,000,000
Notes Payable, Other Payables | Series N Notes | San Jose Water Company
Debt Instrument [Line Items]
Aggregate principal amount					$ 50,000,000
Interest Rate					3.00%

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