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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 |  |  |  |

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