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COMMITMENTS AND CONTINGENT LIABILITIES, SCHEDULE OF FUTURE COMMITTED EXPENSES (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2015 USD ($)
Long-term Purchase Commitment [Line Items]
Current charges recoverable through BGSS	$ 86,900
Purchase Obligation, Fiscal Year Maturity [Abstract]
2016	492,559	[1]
2017	230,065	[1]
2018	142,009	[1]
2019	113,263	[1]
2020	102,704	[1]
Thereafter	$ 790,199	[1]
Minimum [Member]
Long-term Purchase Commitment [Line Items]
Storage and pipeline capacity, fixed period	1 year
Maximum [Member]
Long-term Purchase Commitment [Line Items]
Storage and pipeline capacity, fixed period	10 years
NJRES [Member] | Natural Gas Purchases [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
2016	$ 230,355
2017	4,438
2018	0
2019	0
2020	0
Thereafter	0
NJRES [Member] | Storage Demand Fees [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
2016	27,734
2017	12,162
2018	7,591
2019	4,473
2020	3,672
Thereafter	3,270
NJRES [Member] | Pipeline Demand Fees [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
2016	82,777
2017	35,118
2018	15,440
2019	7,513
2020	4,256
Thereafter	3,900
NJRES [Member] | Subtotal [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
2016	340,866
2017	51,718
2018	23,031
2019	11,986
2020	7,928
Thereafter	7,170
NJNG [Member] | Natural Gas Purchases [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
2016	64,834
2017	71,248
2018	11,516
2019	0
2020	0
Thereafter	0
NJNG [Member] | Storage Demand Fees [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
2016	29,019
2017	25,332
2018	15,871
2019	11,079
2020	5,345
Thereafter	0
NJNG [Member] | Pipeline Demand Fees [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
2016	57,840
2017	81,767
2018	91,591
2019	90,198
2020	89,431
Thereafter	783,029
NJNG [Member] | Subtotal [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
2016	151,693
2017	178,347
2018	118,978
2019	101,277
2020	94,776
Thereafter	$ 783,029
[1] Does not include amounts related to intercompany asset management agreements between NJRES and NJNG.

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Current Charges Recoverable Through Basic Gas Supply Service as shown for the reporting period

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