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Bank Borrowings and Long-Term Liabilities (Details) - USD ($) |  |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 13, 2021 | Apr. 23, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 01, 2021 | Aug. 04, 2021 | Jun. 25, 2021 | Mar. 02, 2021
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of lines of credit |  |  | $ 120,120,000 | $ 218,290,000 |  |  |  |
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% |
Notes Payable, Other Payables | Series 2021A Notes | Connecticut Water Company |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 50,000,000 |  |
Interest rate |  |  |  |  |  | 3.07% |  |
Notes Payable, Other Payables | Series 2021B Notes | Connecticut Water Company | Forecast |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 50,000,000 |  |  |
Interest rate |  |  |  |  | 3.10% |  |  |
Notes Payable, Other Payables | Series O Notes | San Jose Water Company |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 50,000,000 |  |
Interest rate |  |  |  |  |  | 3.00% |  |

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