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DEBT - FIRST MORTGAGE BONDS (Details)
Aug. 01, 2019
USD ($)
First_mortgage_bond
Apr. 18, 2019
USD ($)
First_mortgage_bond
Sep. 30, 2019
USD ($)
Jul. 17, 2019
USD ($)
Sep. 30, 2018
USD ($)
Debt Instrument [Line Items]          
NJBPU dividend restriction, equity to capitalization ratio     0.30    
Debt to equity ratio     0.563    
First mortgage bonds:          
Debt Instrument [Line Items]          
Maximum amount that can be issued     $ 1,000,000,000    
NJNG          
Debt Instrument [Line Items]          
Number of first mortgage bonds completed | First_mortgage_bond 3 3      
Proceeds from reissuance of first mortgage bond $ 97,000,000 $ 35,800,000      
NJNG | First mortgage bonds:          
Debt Instrument [Line Items]          
Weighted average interest rate   3.02%      
NJNG | First mortgage bonds: | Series OO          
Debt Instrument [Line Items]          
Long-term debt     $ 46,500,000   $ 46,500,000
Stated interest rate     3.00%    
NJNG | First mortgage bonds: | Series CCC (formally NN)          
Debt Instrument [Line Items]          
Long-term debt     $ 41,000,000   41,000,000
Stated interest rate     3.00%    
NJNG | First mortgage bonds: | Series BBB (formally MM)          
Debt Instrument [Line Items]          
Long-term debt     $ 9,545,000   $ 9,545,000
Stated interest rate     2.75%    
NJNG | Unsecured Senior Note 3.76%          
Debt Instrument [Line Items]          
Long-term debt       $ 100,000,000  
Stated interest rate       3.76%  
NJNG | Unsecured Senior Note 3.86%          
Debt Instrument [Line Items]          
Long-term debt       $ 85,000,000  
Stated interest rate       3.86%