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RELATED PARTY TRANSACTIONS (Details) $ in Thousands		1 Months Ended		12 Months Ended
	Apr. 01, 2020 USD ($) Bcf	Jun. 30, 2022	Mar. 31, 2021	Sep. 30, 2022 USD ($) dekatherm lease Bcf	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jul. 31, 2021
Related Party Transaction [Line Items]
Demand fees expense recognized pertaining to related party agreement				$ 7,395	$ 7,013	$ 6,083
Demand fees payable				$ 851	861
Number of asset management agreements | lease				1
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				$ 6,663	6,449	5,900
Demand fees payable				775	778
NJRES to Steckman Ridge Affiliate
Related Party Transaction [Line Items]
Demand fees expense recognized pertaining to related party agreement				732	564	$ 183
Demand fees payable				$ 76	$ 83
NJNG to Adelphia Affiliate
Related Party Transaction [Line Items]
Transportation capacity under precedent agreement with PennEast (in bcf per day) | dekatherm				130,000
NJNG to Adelphia Affiliate | Transportation Precedent Agreement One
Related Party Transaction [Line Items]
Transportation precedent agreement term				5 years
NJNG to Adelphia Affiliate | Transportation Precedent Agreement Two
Related Party Transaction [Line Items]
Transportation precedent agreement term				15 years
Transportation capacity under precedent agreement with PennEast (in bcf per day) | dekatherm				130,000
Right to reduction term				7 years
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
NJNG and Clean Energy Ventures to PPA
Related Party Transaction [Line Items]
Sublease agreement term		20 years	15 years
NJNG to NJR Subsidiaries
Related Party Transaction [Line Items]
Term of contract							16 years

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