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COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details) - USD ($) $ in Thousands |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 09, 2020 | Sep. 08, 2020 | Mar. 16, 2020 | Sep. 27, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Loss Contingencies [Line Items] |  |  |  |  |  |
Regulatory assets |  |  |  |  | $ 527,459 | $ 496,637
Regulatory liabilities-noncurrent |  |  |  |  | $ 196,450 | 202,435
Recovery period |  |  |  |  | 7 years |
Minimum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation settlement, gross |  |  |  |  | $ 143,100 |
Maximum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation settlement, gross |  |  |  |  | 181,700 |
Environmental remediation costs, Liability for future expenditures |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Regulatory assets |  |  |  |  | 150,600 | $ 131,100
Environmental remediation costs, Expended, net of recoveries |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Regulatory assets |  |  |  |  | $ 36,500 |
RAC |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Approved rate, amount | $ 9,700 | $ 8,500 |  |  |  |
NJNG | RAC |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Requested base rate increase (decrease), amount |  |  | $ 1,200 | $ 1,400 |  |

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