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Long-Term Liabilities and Bank Borrowings	3 Months Ended
Long-Term Liabilities and Bank Borrowings	Mar. 31, 2018
Debt Disclosure [Abstract]
Long-Term Liabilities and Bank Borrowings	Long-Term Liabilities and Bank Borrowings SJW Group’s contractual obligations and commitments include senior notes, mortgages and other obligations. San Jose Water Company, a subsidiary of SJW Group, has received advance deposit payments from its customers on certain construction projects. Refunds of the advance deposit payments constitute an obligation of San Jose Water Company solely.