DEBT - SALE-LEASEBACKS (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Proceeds from sale leaseback transaction	$ 8,441	$ 17,300	$ 0
Minimum | Meter License
Debt Instrument [Line Items]
Term of contract	7 years
Maximum | Meter License
Debt Instrument [Line Items]
Term of contract	10 years
NJNG
Debt Instrument [Line Items]
Proceeds from sale leaseback transaction	$ 8,400	17,300
Payments for sale leaseback transaction	$ 0	$ 1,100