DEBT - REDEMPTION REQUIREMENTS (Details) $ in Thousands	Sep. 30, 2023 USD ($)
NJR
Debt Instrument [Line Items]
2024	$ 0
2025	100,000
2026	100,000
2027	110,000
2028	100,000
Thereafter	710,000
NJNG
Debt Instrument [Line Items]
2024	70,000
2025	50,000
2026	0
2027	0
2028	50,000
Thereafter	$ 1,297,845