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REGULATION - REGULATORY FILINGS (Details) - USD ($)
$ in Millions
 6 Months Ended
Dec. 24, 2015
Nov. 13, 2015
Oct. 15, 2015
Mar. 31, 2016
Schedule of Regulatory [Line Items]        
Bill credits issued during the period       $ 61.6
Increase in base tariff rates   $ 147.6    
NJ RISE Program [Member]        
Schedule of Regulatory [Line Items]        
Increase (decrease) in approved rate, percentage     0.07%  
NJCEP [Member]        
Schedule of Regulatory [Line Items]        
Increase (decrease) in approved rate, percentage (0.80%)      
CIP [Member]        
Schedule of Regulatory [Line Items]        
Increase in average residential heat customer's bill (as a percent)       0.08%