XML 89 R75.htm IDEA: XBRL DOCUMENT
v3.25.2

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

X
- Definition Demand Fee Commitments + References No definition available. + Details
Name: | njr_DemandFeeCommitments
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration