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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, DEMAND FEES (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Demand fees	$ 214.0	$ 215.1	$ 216.5
NJRES [Member]
Demand fees	122.0	123.0	129.8
NJNG [Member]
Demand fees	$ 92.0	$ 92.1	$ 86.7
Minimum [Member]
Storage and pipeline capacity, contract term	1 year
Maximum [Member]
Storage and pipeline capacity, contract term	10 years

X

- Definition

Demand fees incurred associated with contracts for storage and/or pipeline capacity and recognized as a component of gas purchases.

+ References

No definition available.

+ Details

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

X

- Definition

Storage and Pipeline Capacity, Term of Contract

+ References

No definition available.

+ Details

Name:	njr_StorageandPipelineCapacityTermofContract
Namespace Prefix:	njr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration