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COMMITMENTS AND CONTINGENT LIABILITIES, SCHEDULE OF FUTURE COMMITTED EXPENSES (Details) (USD $)	12 Months Ended
	Sep. 30, 2014
Long-term Purchase Commitment [Line Items]
Current charges recoverable through BGSS	$ 78,300,000
Purchase Obligation, Fiscal Year Maturity [Abstract]
2015	581,526,000	[1]
2016	138,197,000	[1]
2017	79,358,000	[1]
2018	112,856,000	[1]
2019	105,086,000	[1]
Thereafter	874,319,000	[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]
2015	298,563,000
2016	18,402,000
2017	0
2018	0
2019	0
Thereafter	0
NJRES [Member] | Storage Demand Fees [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
2015	27,883,000
2016	10,471,000
2017	5,612,000
2018	3,500,000
2019	1,782,000
Thereafter	2,598,000
NJRES [Member] | Pipeline Demand Fees [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
2015	76,524,000
2016	41,759,000
2017	21,828,000
2018	14,499,000
2019	6,638,000
Thereafter	6,861,000
NJRES [Member] | Natural Gas Purchases and Future Demand Fees [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
2015	402,970,000
2016	70,632,000
2017	27,440,000
2018	17,999,000
2019	8,420,000
Thereafter	9,459,000
NJNG [Member] | Natural Gas Purchases [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
2015	100,218,000
2016	5,328,000
2017	34,000
2018	0
2019	0
Thereafter	0
NJNG [Member] | Storage Demand Fees [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
2015	24,045,000
2016	17,865,000
2017	10,883,000
2018	9,299,000
2019	9,299,000
Thereafter	4,649,000
NJNG [Member] | Pipeline Demand Fees [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
2015	54,293,000
2016	44,372,000
2017	41,001,000
2018	85,558,000
2019	87,367,000
Thereafter	860,211,000
NJNG [Member] | Natural Gas Purchases and Future Demand Fees [Member]
Purchase Obligation, Fiscal Year Maturity [Abstract]
2015	178,556,000
2016	67,565,000
2017	51,918,000
2018	94,857,000
2019	96,666,000
Thereafter	$ 864,860,000
[1] Does not include amounts related to intercompany asset management agreements between NJRES and NJNG.

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- Definition

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

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Storage and Pipeline Capacity, Term of Contract

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- Definition

Minimum amount of purchase arrangement maturing after the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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- Definition

Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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