Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

DEBT - NJR LONG-TERM DEBT (Details) - NJR - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 16, 2022	Jun. 23, 2022	Sep. 30, 2021
Unsecured senior notes 4.38%
Debt Instrument [Line Items]
Long-term debt	$ 110,000		$ 110,000	$ 0
Stated interest rate	4.38%		4.38%
Unsecured senior notes 3.64%
Debt Instrument [Line Items]
Long-term debt	$ 50,000	$ 50,000		$ 0
Stated interest rate	3.64%	3.64%