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COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details) $ in Thousands | 1 Months Ended | 9 Months Ended | 18 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) site | May. 31, 2015 USD ($) | Sep. 30, 2014 USD ($)
Site Contingency [Line Items] |  |  |  |
Recovery of expenditures, including carrying costs, rolling period approved by the BPU |  | 7 years |  |
Regulatory assets | $ 351,763 | $ 351,763 |  | $ 377,575
Number of MGP sites | site |  | 5 |  |
Minimum [Member] |  |  |  |
Site Contingency [Line Items] |  |  |  |
Litigation settlement, gross |  | $ 151,300 |  |
Maximum [Member] |  |  |  |
Site Contingency [Line Items] |  |  |  |
Litigation settlement, gross |  | 249,800 |  |
Environmental Remediation Costs Expended, Net of Recoveries [Member] |  |  |  |
Site Contingency [Line Items] |  |  |  |
Regulatory assets | 18,095 | 18,095 |  | 30,916
Environmental Remediation Costs Liability for Future Expenditures [Member] |  |  |  |
Site Contingency [Line Items] |  |  |  |
Regulatory assets | 177,000 | $ 177,000 |  | $ 177,000
RA [Member] | July 2013 SBC Filing [Member] |  |  |  |
Site Contingency [Line Items] |  |  |  |
Reduction in the RA factor |  |  | $ 18,700 |
RA [Member] | September 2014 SBC Filing [Member] |  |  |  |
Site Contingency [Line Items] |  |  |  |
Reduction in the RA factor | $ 8,500 |  |  |

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