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COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details) - USD ($) $ in Thousands				3 Months Ended
	Sep. 13, 2022	Mar. 23, 2022	Apr. 07, 2021	Dec. 31, 2022	Sep. 30, 2022
Site Contingency [Line Items]
Manufactured gas plant remediation				$ 125,717	$ 127,060
Recovery from third party of environmental remediation cost, period				7 years
Regulatory assets				$ 495,849	$ 500,666
Expended, net of recoveries
Site Contingency [Line Items]
Regulatory assets				65,700
RAC
Site Contingency [Line Items]
Approved rate, amount	$ 15,500	$ 11,700	$ 11,100
Approved rate increase (decrease), amount	$ 3,800
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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