DEBT - REDEMPTION REQUIREMENTS (Details) $ in Thousands	Sep. 30, 2025 USD ($)
NJR
Debt Instrument [Line Items]
2026	$ 100,000
2027	110,000
2028	100,000
2029	150,000
2030	130,000
Thereafter	530,000
NJNG
Debt Instrument [Line Items]
2026	0
2027	0
2028	50,000
2029	0
2030	0
Thereafter	$ 1,747,845