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COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 27, 2019
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Site Contingency [Line Items]          
Manufactured gas plant remediation   $ 129,241 $ 131,080    
Recovery from third party of environmental remediation cost, period   7 years      
Regulatory assets   $ 490,283 496,637   $ 496,637
Expended, net of recoveries          
Site Contingency [Line Items]          
Regulatory assets   38,170     $ 38,351
RAC          
Site Contingency [Line Items]          
Approved rate, amount     $ 8,500 $ 7,100  
Minimum          
Site Contingency [Line Items]          
Product liability contingency, loss exposure in excess of accrual, best estimate   115,900      
Maximum          
Site Contingency [Line Items]          
Product liability contingency, loss exposure in excess of accrual, best estimate   $ 186,200      
NJNG | RAC          
Site Contingency [Line Items]          
Requested rate increase (decrease), amount $ 1,400