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COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details) |  | 6 Months Ended |
--- | --- | --- | ---
Jun. 29, 2016 USD ($) | Mar. 31, 2017 USD ($) site | Sep. 30, 2016 USD ($)
Site Contingency [Line Items] |  |  |
Number of MGP sites | site |  | 5 |
Recovery of expenditures, including carrying costs, rolling period approved by the BPU |  | 7 years |
Regulatory assets |  | $ 396,924,000 | $ 441,294,000
Manufactured gas plant remediation |  | 165,849,000 | 172,000,000
Minimum |  |  |
Site Contingency [Line Items] |  |  |
Litigation settlement, gross |  | 143,900,000 |
Loss contingency, estimate of possible loss |  | 600,000 |
Maximum |  |  |
Site Contingency [Line Items] |  |  |
Litigation settlement, gross |  | 231,600,000 |
Loss contingency, estimate of possible loss |  | 3,200,000 |
Expended, net of recoveries |  |  |
Site Contingency [Line Items] |  |  |
Regulatory assets |  | 19,067,000 | 19,595,000
Liability for future expenditures |  |  |
Site Contingency [Line Items] |  |  |
Regulatory assets |  | $ 165,849,000 | $ 172,000,000
SBC | December 2015 SBC Filing |  |  |
Site Contingency [Line Items] |  |  |
Public utilities, approved rate, amount | $ 9,400,000 |  |

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