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COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details) - USD ($) $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 13, 2022 | Mar. 23, 2022 | Apr. 07, 2021 | Apr. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Loss Contingencies [Line Items] |  |  |  |  |  |
Manufactured gas plant remediation |  |  |  |  | $ 127,060 | $ 135,012
Recovery from third party of environmental remediation cost, period |  |  |  |  | 7 years |
Regulatory assets |  |  |  |  | $ 500,666 | $ 522,099
Expended, net of recoveries |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Regulatory assets |  |  |  |  | 66,100 |
RAC |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Approved rate, amount | $ 15,500 | $ 11,700 | $ 11,100 |  |  |
Approved rate increase (decrease), amount | $ 3,800 | $ 600 |  | $ 1,300 |  |
Minimum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Product liability contingency, loss exposure in excess of accrual, best estimate |  |  |  |  | 110,800 |
Maximum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Product liability contingency, loss exposure in excess of accrual, best estimate |  |  |  |  | $ 167,100 |

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