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COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details) | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) site | Sep. 30, 2018 USD ($)
Site Contingency [Line Items] |  |  |  |
Number of MGP sites | site |  |  | 5 |
Environmental remediation expense |  |  | $ 600,000 |
Environmental remediation expense, incurred to date |  |  | 1,500,000 |
Manufactured gas plant remediation | $ 125,566,000 |  | $ 125,566,000 | $ 130,800,000
Recovery from third party of environmental remediation cost, period |  |  | 7 years |
Regulatory assets | 388,769,000 |  | $ 388,769,000 | 368,592,000
Minimum |  |  |  |
Site Contingency [Line Items] |  |  |  |
Product liability contingency, loss exposure in excess of accrual, best estimate |  |  | 117,700,000 |
Maximum |  |  |  |
Site Contingency [Line Items] |  |  |  |
Product liability contingency, loss exposure in excess of accrual, best estimate |  |  | 204,100,000 |
Expended, net of recoveries |  |  |  |
Site Contingency [Line Items] |  |  |  |
Regulatory assets | 34,340,000 |  | $ 34,340,000 | $ 33,017,000
RAC |  |  |  |
Site Contingency [Line Items] |  |  |  |
Approved rate, amount | $ 8,500,000 | $ 7,100,000 |  |
NJDEP |  |  |  |
Site Contingency [Line Items] |  |  |  |
Number of MGP sites | site |  |  | 2 |

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