RELATED PARTY TRANSACTIONS - DEMAND FEES (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2024
Related Party Transaction [Line Items]
Demand fees payable	$ 881		$ 875
Related Party
Related Party Transaction [Line Items]
Demand fees expense recognized pertaining to related party agreement	1,718	$ 1,879
Demand fees payable	881		875
Related Party | NJNG to Steckman RIdge Affiliate
Related Party Transaction [Line Items]
Demand fees expense recognized pertaining to related party agreement	1,524	1,655
Demand fees payable	775		775
Related Party | NJRES to Steckman Ridge Affiliate
Related Party Transaction [Line Items]
Demand fees expense recognized pertaining to related party agreement	194	$ 224
Demand fees payable	$ 106		$ 100