DEBT - SALE-LEASEBACKS (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Proceeds from sale leaseback transaction	$ 17,300	$ 0	$ 4,000
NJNG
Debt Instrument [Line Items]
Proceeds from sale leaseback transaction	17,300	0	$ 4,000
Payments for sale leaseback transaction	$ 1,100	$ 1,200
NJNG | Minimum
Debt Instrument [Line Items]
Term of lease	7 years
NJNG | Maximum
Debt Instrument [Line Items]
Term of lease	11 years