ASSET RETIREMENT OBLIGATIONS (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Estimated Accretion
2023	$ 2,767
2024	2,900
2025	3,038
2026	3,180
2027	3,328
Total	15,213
NJNG
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at period beginning	41,611	$ 29,280
Accretion	2,052	1,612
Additions	161	5,697
Change in assumptions	7,339	6,151
Retirements	(1,289)	(1,129)
Balance at period end	49,874	41,611
Clean Energy Ventures
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at period beginning	4,694	4,444
Accretion	186	182
Additions	281	68
Change in assumptions	0	0
Retirements	0	0
Balance at period end	$ 5,161	$ 4,694