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RELATED PARTY TRANSACTIONS - DEMAND FEES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024
Related Party Transaction [Line Items]
Demand fees payable	$ 646		$ 646		$ 875
Related Party
Related Party Transaction [Line Items]
Demand fees expense recognized pertaining to related party agreement	1,268	$ 1,729	4,652	$ 5,407
Demand fees payable	646		646		875
Related Party | NJNG to Steckman RIdge Affiliate
Related Party Transaction [Line Items]
Demand fees expense recognized pertaining to related party agreement	1,075	1,541	4,086	4,781
Demand fees payable	540		540		775
Related Party | NJRES to Steckman Ridge Affiliate
Related Party Transaction [Line Items]
Demand fees expense recognized pertaining to related party agreement	193	$ 188	566	$ 626
Demand fees payable	$ 106		$ 106		$ 100

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