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COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details)
$ in Thousands
 1 Months Ended 9 Months Ended
May 31, 2015
USD ($)
Jun. 30, 2016
USD ($)
site
Sep. 30, 2015
USD ($)
Commitments and Contingencies Disclosure [Abstract]      
Number of MGP sites | site   5  
Recovery of expenditures, including carrying costs, rolling period approved by the BPU   7 years  
Site Contingency [Line Items]      
Regulatory assets   $ 447,226 $ 410,155
Minimum [Member]      
Site Contingency [Line Items]      
Litigation settlement, gross   150,900  
Maximum [Member]      
Site Contingency [Line Items]      
Litigation settlement, gross   242,100  
Environmental Remediation Costs Expended, Net of Recoveries [Member]      
Site Contingency [Line Items]      
Regulatory assets   18,543 18,886
Environmental Remediation Costs Liability for Future Expenditures [Member]      
Site Contingency [Line Items]      
Regulatory assets   $ 175,310 $ 180,400
SBC [Member] | September 2014 SBC Filing [Member]      
Site Contingency [Line Items]      
Requested rate, amount $ 8,500