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DEBT - SCHEDULE OF LONG TERM DEBT (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Debt Instrument [Line Items]          
Payments of long-term debt       $ 43,454 $ 7,800
Proceeds from sale-leaseback transaction       9,587 $ 7,107
NJNG          
Debt Instrument [Line Items]          
Proceeds from sale-leaseback transaction $ 9,600 $ 7,100      
Sale leaseback transaction, other payments required       $ 1,000  
NJNG | First Mortgage          
Debt Instrument [Line Items]          
Payments of long-term debt     $ 35,800    
Series II | NJNG | First Mortgage          
Debt Instrument [Line Items]          
Interest rate, stated percentage     4.50% 4.50%  
Series KK | NJNG | First Mortgage          
Debt Instrument [Line Items]          
Interest rate, stated percentage     4.90% 4.90%