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RELATED PARTY TRANSACTIONS (Details) $ in Thousands				1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 19, 2021 DTH	Apr. 01, 2020 USD ($) Bcf	Apr. 01, 2010	Mar. 31, 2021	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) DTH lease Bcf	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)
Related Party Transaction [Line Items]
Demand fees expense recognized pertaining to related party agreement					$ 1,700	$ 1,518	$ 5,163	$ 4,548
Demand fees payable					863		$ 863		$ 791
Number of asset management agreements | lease							2
NJNG to NJRES Affiliate
Related Party Transaction [Line Items]
Asset management agreement, period			5 years
NJNG to Steckman RIdge Affiliate
Related Party Transaction [Line Items]
Natural gas sold at cost under asset management agreement (in Bcf) | Bcf		3
Approximate annual demand fees under agreement		$ 9,300
Demand fees expense recognized pertaining to related party agreement					1,687	1,491	$ 4,760	4,462
Demand fees payable					776		776		775
NJRES to Steckman Ridge Affiliate
Related Party Transaction [Line Items]
Demand fees expense recognized pertaining to related party agreement					13	$ 27	403	$ 86
Demand fees payable					$ 87		$ 87		$ 16
NJNG to PennEast Affiliate
Related Party Transaction [Line Items]
Natural gas transportation capacity agreement, period							15 years
Transportation capacity under precedent agreement with PennEast (in bcf per day) | DTH							180,000
NJRES to PennEast Affiliate
Related Party Transaction [Line Items]
Natural gas transportation capacity agreement, period							5 years
Transportation capacity under precedent agreement with PennEast (in bcf per day) | DTH							50,000
NJN G to Adelphia Affiliate
Related Party Transaction [Line Items]
Transportation capacity under precedent agreement with PennEast (in bcf per day) | DTH							130,000
Leaf River Energy Center LLC
Related Party Transaction [Line Items]
Natural gas sold at cost under asset management agreement (in Bcf) | Bcf							3
Storage capacity agreement term							5 years
Storage capacity park and loan agreement | DTH	330,000
NJNG and Clean Energy Ventures to PPA
Related Party Transaction [Line Items]
Sublease agreement term				15 years

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