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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) $ in Millions	12 Months Ended
	Sep. 30, 2020 USD ($)
Statement of Cash Flows [Abstract]
Cash acquired	$ 5.1

X

- Definition

Cash Acquired From Asset Acquisition

+ References

No definition available.

+ Details

Name:	njr_CashAcquiredFromAssetAcquisition
Namespace Prefix:	njr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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