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COMMITMENTS AND CONTINGENT LIABILITIES - SCHEDULE OF FUTURE COMMITTED EXPENSES (Details) (USD $)	3 Months Ended
	Dec. 31, 2012
Long-term Purchase Commitment [Line Items]
Current charges recoverable through BGSS	$ 94,000,000
Natural Gas Purchases [Member] | NJRES [Member] | 2013 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	289,808,000
Natural Gas Purchases [Member] | NJRES [Member] | 2014 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	16,049,000
Natural Gas Purchases [Member] | NJRES [Member] | 2015 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	0
Natural Gas Purchases [Member] | NJRES [Member] | 2016 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	0
Natural Gas Purchases [Member] | NJRES [Member] | 2017 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	0
Natural Gas Purchases [Member] | NJRES [Member] | Thereafter [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	0
Natural Gas Purchases [Member] | NJNG [Member] | 2013 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	72,749,000
Natural Gas Purchases [Member] | NJNG [Member] | 2014 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	102,008,000
Natural Gas Purchases [Member] | NJNG [Member] | 2015 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	106,661,000
Natural Gas Purchases [Member] | NJNG [Member] | 2016 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	8,921,000
Natural Gas Purchases [Member] | NJNG [Member] | 2017 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	113,000
Natural Gas Purchases [Member] | NJNG [Member] | Thereafter [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	0
Storage Demand Fees [Member] | NJRES [Member] | 2013 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	24,070,000
Storage Demand Fees [Member] | NJRES [Member] | 2014 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	19,916,000
Storage Demand Fees [Member] | NJRES [Member] | 2015 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	12,037,000
Storage Demand Fees [Member] | NJRES [Member] | 2016 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	7,106,000
Storage Demand Fees [Member] | NJRES [Member] | 2017 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	5,035,000
Storage Demand Fees [Member] | NJRES [Member] | Thereafter [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	7,318,000
Storage Demand Fees [Member] | NJNG [Member] | 2013 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	21,861,000
Storage Demand Fees [Member] | NJNG [Member] | 2014 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	24,825,000
Storage Demand Fees [Member] | NJNG [Member] | 2015 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	15,854,000
Storage Demand Fees [Member] | NJNG [Member] | 2016 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	11,069,000
Storage Demand Fees [Member] | NJNG [Member] | 2017 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	9,990,000
Storage Demand Fees [Member] | NJNG [Member] | Thereafter [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	23,247,000
Pipeline Demand Fees [Member] | NJRES [Member] | 2013 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	43,518,000
Pipeline Demand Fees [Member] | NJRES [Member] | 2014 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	23,075,000
Pipeline Demand Fees [Member] | NJRES [Member] | 2015 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	10,380,000
Pipeline Demand Fees [Member] | NJRES [Member] | 2016 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	8,755,000
Pipeline Demand Fees [Member] | NJRES [Member] | 2017 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	7,444,000
Pipeline Demand Fees [Member] | NJRES [Member] | Thereafter [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	9,371,000
Pipeline Demand Fees [Member] | NJNG [Member] | 2013 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	47,484,000
Pipeline Demand Fees [Member] | NJNG [Member] | 2014 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	70,197,000
Pipeline Demand Fees [Member] | NJNG [Member] | 2015 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	35,436,000
Pipeline Demand Fees [Member] | NJNG [Member] | 2016 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	34,558,000
Pipeline Demand Fees [Member] | NJNG [Member] | 2017 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	32,753,000
Pipeline Demand Fees [Member] | NJNG [Member] | Thereafter [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	221,838,000
Natural Gas Purchases and Future Demand Fees [Member] | 2013 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	499,490,000	[1]
Natural Gas Purchases and Future Demand Fees [Member] | 2014 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	256,070,000	[1]
Natural Gas Purchases and Future Demand Fees [Member] | 2015 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	180,368,000	[1]
Natural Gas Purchases and Future Demand Fees [Member] | 2016 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	70,409,000	[1]
Natural Gas Purchases and Future Demand Fees [Member] | 2017 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	55,335,000	[1]
Natural Gas Purchases and Future Demand Fees [Member] | Thereafter [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	261,774,000	[1]
Natural Gas Purchases and Future Demand Fees [Member] | NJRES [Member] | 2013 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	357,396,000
Natural Gas Purchases and Future Demand Fees [Member] | NJRES [Member] | 2014 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	59,040,000
Natural Gas Purchases and Future Demand Fees [Member] | NJRES [Member] | 2015 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	22,417,000
Natural Gas Purchases and Future Demand Fees [Member] | NJRES [Member] | 2016 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	15,861,000
Natural Gas Purchases and Future Demand Fees [Member] | NJRES [Member] | 2017 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	12,479,000
Natural Gas Purchases and Future Demand Fees [Member] | NJRES [Member] | Thereafter [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	16,689,000
Natural Gas Purchases and Future Demand Fees [Member] | NJNG [Member] | 2013 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	142,094,000
Natural Gas Purchases and Future Demand Fees [Member] | NJNG [Member] | 2014 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	197,030,000
Natural Gas Purchases and Future Demand Fees [Member] | NJNG [Member] | 2015 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	157,951,000
Natural Gas Purchases and Future Demand Fees [Member] | NJNG [Member] | 2016 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	54,548,000
Natural Gas Purchases and Future Demand Fees [Member] | NJNG [Member] | 2017 [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	42,856,000
Natural Gas Purchases and Future Demand Fees [Member] | NJNG [Member] | Thereafter [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	$ 245,085,000
[1] Does not include amounts related to intercompany asset management agreements between NJRES and NJNG.

X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- Details

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