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RELATED PARTY TRANSACTIONS - DEMAND FEES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2023
Related Party Transaction [Line Items]
Demand fees payable	$ 875		$ 875		$ 859
Related Party
Related Party Transaction [Line Items]
Demand fees expense recognized pertaining to related party agreement	1,729	$ 1,870	5,407	$ 5,467
Demand fees payable	875		875		859
Related Party | NJNG to Steckman RIdge Affiliate
Related Party Transaction [Line Items]
Demand fees expense recognized pertaining to related party agreement	1,541	1,703	4,781	4,973
Demand fees payable	775		775		775
Related Party | NJRES to Steckman Ridge Affiliate
Related Party Transaction [Line Items]
Demand fees expense recognized pertaining to related party agreement	188	$ 167	626	$ 494
Demand fees payable	$ 100		$ 100		$ 84

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