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RATES AND REGULATORY ACTIONS (Details) - USD ($)
$ in Millions
1 Months Ended
Feb. 01, 2019
Apr. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jan. 31, 2019
Jul. 01, 2018
Elizabethtown Gas            
Schedule of Capitalization [Line Items]            
Public utilities budget         $ 3.0  
Elkton Gas            
Schedule of Capitalization [Line Items]            
Credits due to customers under conditions of approval           $ 0.3
Elizabethtown Gas            
Schedule of Capitalization [Line Items]            
Credits due to customers under conditions of approval           $ 15.0
Energy Efficiency Tracker | SJG Utility Operations            
Schedule of Capitalization [Line Items]            
Approved rate increase (decrease) $ (1.6)          
Annual BGSS Filing | SJG Utility Operations            
Schedule of Capitalization [Line Items]            
Approved rate increase (decrease)       $ (65.5)    
Annual SBC Filing | SJG Utility Operations            
Schedule of Capitalization [Line Items]            
Approved rate increase (decrease)     $ (2.2)      
Subsequent event | Elizabethtown Gas            
Schedule of Capitalization [Line Items]            
Public Utilities, Net Plant Additions Not Reflected in Current Rates   $ 346.0        
Subsequent event | New Jersey Board of Public Utilities | Elizabethtown Gas            
Schedule of Capitalization [Line Items]            
Requested revenue increase   65.0        
Subsequent event | Stipulation of Settlement | SJG Utility Operations            
Schedule of Capitalization [Line Items]            
Approved rate increase (decrease)   $ (65.5)        
Regulatory Costs, Original Recovery Period of Expenditures   2 years        
Public Utilities, Bill Credit   $ 24.0