DEBT - LONG TERM DEBT (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Proceeds from sale leaseback transactions - natural gas meters	$ 15,016	$ 11,714
Proceeds from sale leaseback transactions - solar	23,240	12,567
NJNG
Debt Instrument [Line Items]
Proceeds from sale leaseback transactions - natural gas meters	15,000	11,700
NJRCEV
Debt Instrument [Line Items]
Proceeds from sale leaseback transactions - solar	$ 23,200	$ 12,600