REGULATION - ADDITIONAL INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Sep. 30, 2022
Schedule of Regulatory Filings [Line Items]
Regulatory assets	$ 495,849	$ 500,666
NJNG
Schedule of Regulatory Filings [Line Items]
Regulatory assets	$ 3,900	$ 6,900
Base Rate Stipulation
Schedule of Regulatory Filings [Line Items]
Weighted average cost of capital	6.84%
Approved return on equity	9.60%