DEBT - REDEMPTION REQUIREMENTS (Details) $ in Thousands	Sep. 30, 2024 USD ($)
NJR
Debt Instrument [Line Items]
2025	$ 100,000
2026	100,000
2027	110,000
2028	100,000
2029	150,000
Thereafter	560,000
NJNG
Debt Instrument [Line Items]
2025	50,000
2026	0
2027	0
2028	50,000
2029	0
Thereafter	$ 1,547,845