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COMMITMENTS AND CONTINGENT LIABILITIES - GUARANTEES (Details) $ in Millions	Jun. 30, 2025 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Demand fee commitments	$ 133.5

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- Definition

Demand Fee Commitments

+ References

No definition available.

+ Details

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Namespace Prefix:	njr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration