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COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details) - USD ($) $ in Thousands |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 12, 2023 | Mar. 23, 2022 | Apr. 07, 2021 | Jun. 30, 2023 | Sep. 30, 2022
Site Contingency [Line Items] |  |  |  |  |
Manufactured gas plant remediation |  |  |  | $ 123,070 | $ 127,060
Recovery from third party of environmental remediation cost, period |  |  |  | 7 years |
Regulatory assets |  |  |  | $ 528,114 | $ 500,666
Expended, net of recoveries |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |
Regulatory assets |  |  |  | 63,800 |
RAC |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |
Approved rate, amount | $ 15,400 | $ 11,700 | $ 11,100 |  |
Interim rate increase (decrease), amount | $ 3,700 |  |  |  |
Minimum |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |
Product liability contingency, loss exposure in excess of accrual, best estimate |  |  |  | 110,800 |
Maximum |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |
Product liability contingency, loss exposure in excess of accrual, best estimate |  |  |  | $ 167,100 |

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