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DEBT - FIRST MORTGAGE BONDS (Details)
$ in Thousands
12 Months Ended
Mar. 13, 2018
USD ($)
Jan. 17, 2017
USD ($)
First_mortgage_bond
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Jun. 21, 2016
Jun. 01, 2015
Debt Instrument [Line Items]              
NJBPU dividend restriction, equity to capitalization ratio     0.3        
Debt to equity ratio     0.567        
Number of first mortgage bonds completed | First_mortgage_bond   3          
Payment of long-term debt     $ 165,486 $ 97,854 $ 13,289    
Variable Rate Debt              
Debt Instrument [Line Items]              
Long-term debt     97,000        
First mortgage bonds:              
Debt Instrument [Line Items]              
Maximum amount that can be issued     1,000,000        
Natural Gas Distribution | Series LL              
Debt Instrument [Line Items]              
Long-term debt     $ 125,000        
Stated interest rate     5.60%        
Natural Gas Distribution | First mortgage bonds:              
Debt Instrument [Line Items]              
Payment of long-term debt   $ 35,800          
Natural Gas Distribution | First mortgage bonds: | Series UU              
Debt Instrument [Line Items]              
Long-term debt     $ 125,000 125,000      
Stated interest rate     3.63%     3.63%  
Natural Gas Distribution | First mortgage bonds: | Series VV              
Debt Instrument [Line Items]              
Long-term debt     $ 125,000 0      
Stated interest rate     4.01%        
Natural Gas Distribution | First mortgage bonds: | Series LL              
Debt Instrument [Line Items]              
Long-term debt     $ 0 $ 125,000      
Natural Gas Distribution | Variable demand rate notes              
Debt Instrument [Line Items]              
Interest rate on EDA Bonds     2.03%        
Natural Gas Distribution | Minimum | First mortgage bonds: | Series II              
Debt Instrument [Line Items]              
Stated interest rate   4.50%          
Natural Gas Distribution | Maximum | First mortgage bonds: | Series II              
Debt Instrument [Line Items]              
Stated interest rate   4.90%          
Treasury lock              
Debt Instrument [Line Items]              
Stated interest rate             4.01%
Fixed treasury rate             3.26%
Amount of gain (loss) recognized in income on derivatives $ 2,600