RELATED PARTY TRANSACTIONS - ADDITIONAL INFORMATION (Details) $ in Millions		1 Months Ended	3 Months Ended
	Jan. 03, 2025 dth / d	Apr. 30, 2020 USD ($) Bcf	Dec. 31, 2024 dth / d numberOfAgreement Bcf
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 | $		$ 9.3
NJNG to Adelphia Affiliate
Related Party Transaction [Line Items]
Number of transportation agreements | numberOfAgreement			2
NJNG to Adelphia Affiliate | Subsequent Event
Related Party Transaction [Line Items]
Transportation capacity under precedent agreement (in bcf per day)	10,000
NJNG to Adelphia Affiliate | Transportation Precedent Agreement One
Related Party Transaction [Line Items]
Transportation capacity under precedent agreement (in bcf per day)			130,000
Transportation precedent agreement term			5 years
NJNG to Adelphia Affiliate | Transportation Precedent Agreement Two
Related Party Transaction [Line Items]
Transportation capacity under precedent agreement (in bcf per day)			130,000
Transportation precedent agreement term			15 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 | Sublease Agreement One
Related Party Transaction [Line Items]
Sublease agreement term			15 years
NJNG and Clean Energy Ventures to PPA | Sublease Agreement Two
Related Party Transaction [Line Items]
Sublease agreement term			20 years
NJNG To NJR Subsidiaries
Related Party Transaction [Line Items]
Term of contract			16 years