XML 123 R1.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Document and Entity Information Document - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Feb. 24, 2020
Jun. 30, 2019
Entity [Abstract]      
Document Fiscal Period Focus FY    
Entity Common Stock, Shares Outstanding   28,493,151  
Title of 12(b) Security Common Stock, par value $0.001 per share    
Entity Incorporation, State or Country Code DE    
Document Transition Report false    
Document Annual Report true    
Entity Central Index Key 0000766829    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Amendment Flag false    
Document Type 10-K    
Document Period End Date Dec. 31, 2019    
Entity File Number 001-8966    
Entity Registrant Name SJW GROUP    
Entity Tax Identification Number 77-0066628    
Entity Address, Address Line One 110 West Taylor Street,    
Entity Address, City or Town San Jose,    
Entity Address, Country CA    
Entity Address, Postal Zip Code 95110    
City Area Code (408)    
Local Phone Number 279-7800    
Trading Symbol SJW    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 1,586
Documents Incorporated by Reference [Text Block]
Portions of the registrant’s Proxy Statement relating to the registrant’s Annual Meeting of Stockholders, to be held on April 29, 2020, are incorporated by reference into Part III of this Form 10-K where indicated.