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LINES OF CREDIT (Details)
1 Months Ended 12 Months Ended
Sep. 30, 2017
Aug. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
Line of Credit Facility [Line Items]          
Total Facility     $ 660,000,000    
Usage     353,800,000    
Available Liquidity     $ 306,200,000    
Weighted average borrowing cost     2.46% 1.47% 1.13%
Average borrowings outstanding     $ 276,700,000 $ 321,900,000  
Maximum amounts outstanding     $ 373,800,000 $ 467,700,000  
Financial covenant, ratio of indebtedness to consolidated total capitalization (not more than)     0.65    
Letters of credit          
Line of Credit Facility [Line Items]          
Total Facility     $ 6,600,000.0    
South Jersey Gas Company          
Line of Credit Facility [Line Items]          
Total Facility     210,000,000    
Usage     52,800,000    
Available Liquidity     157,200,000    
Letters of credit outstanding     $ 800,000    
Weighted average interest rate     1.88% 0.97% 0.66%
Average borrowings outstanding     $ 17,600,000 $ 71,500,000  
Maximum amounts outstanding     $ 110,100,000 $ 141,700,000  
Financial covenant, ratio of indebtedness to consolidated total capitalization (not more than)     700.00    
South Jersey Gas Company | Syndicated Revolving Credit Facility | Term facility          
Line of Credit Facility [Line Items]          
Total Facility   $ 200,000,000.0      
South Jersey Gas Company | Syndicated Revolving Credit Facility | Term facility | August 2017 to August 2022          
Line of Credit Facility [Line Items]          
Total Facility   $ 200,000,000.0      
Term of agreement   5 years      
South Jersey Gas Company | Letters of credit          
Line of Credit Facility [Line Items]          
Letters of credit outstanding     $ 6,600,000    
South Jersey Industries Inc.          
Line of Credit Facility [Line Items]          
Total Facility     450,000,000    
Usage     301,000,000    
Available Liquidity     149,000,000    
South Jersey Industries Inc. | Term facility | Term facility          
Line of Credit Facility [Line Items]          
Total Facility   $ 400,000,000      
South Jersey Industries Inc. | Term facility | Term facility | August 2017 to August 2022          
Line of Credit Facility [Line Items]          
Total Facility   $ 400,000,000.0      
Term of agreement   5 years      
South Jersey Industries Inc. | Syndicated Revolving Credit Facility | Term facility          
Line of Credit Facility [Line Items]          
Term of agreement 2 years        
Term facility | South Jersey Gas Company          
Line of Credit Facility [Line Items]          
Total Facility     10,000,000    
Usage     0    
Available Liquidity     10,000,000    
Syndicated Revolving Credit Facility | South Jersey Gas Company          
Line of Credit Facility [Line Items]          
Total Facility     200,000,000    
Usage     52,800,000    
Available Liquidity     147,200,000    
Syndicated Revolving Credit Facility | South Jersey Industries Inc.          
Line of Credit Facility [Line Items]          
Total Facility     400,000,000    
Usage     251,000,000    
Available Liquidity     149,000,000    
Revolving Credit Facility | South Jersey Industries Inc.          
Line of Credit Facility [Line Items]          
Total Facility     50,000,000    
Usage     50,000,000    
Available Liquidity     0    
South Jersey Gas commercial paper program | South Jersey Gas Company          
Line of Credit Facility [Line Items]          
Total Facility     $ 200,000,000.0    
Fixed maturities of notes, which may not exceed specified number of days     270 days