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COMMITMENTS AND CONTINGENT LIABILITIES - SCHEDULE OF FUTURE COMMITTED EXPENSES (Details) - Jun. 30, 2015 - USD ($) $ in Thousands		Total
Long-term Purchase Commitment [Line Items]
Current charges recoverable through BGSS		$ 20,000
Natural Gas Purchases and Future Demand Fees [Member]
Long-term Purchase Commitment [Line Items]
2015	[1]	178,811
2016	[1]	413,613
2017	[1]	207,846
2018	[1]	176,655
2019	[1]	163,047
Thereafter	[1]	1,059,058
NJRES [Member] | Natural Gas Purchases [Member]
Long-term Purchase Commitment [Line Items]
2015		114,201
2016		147,187
2017		4,811
2018		0
2019		0
Thereafter		0
NJRES [Member] | Storage Demand Fees [Member]
Long-term Purchase Commitment [Line Items]
2015		8,761
2016		25,415
2017		10,945
2018		6,942
2019		4,202
Thereafter		7,179
NJRES [Member] | Pipeline Demand Fees [Member]
Long-term Purchase Commitment [Line Items]
2015		23,176
2016		59,397
2017		32,485
2018		15,393
2019		7,523
Thereafter		8,157
NJRES [Member] | Natural Gas Purchases and Future Demand Fees [Member]
Long-term Purchase Commitment [Line Items]
2015		146,138
2016		231,999
2017		48,241
2018		22,335
2019		11,725
Thereafter		$ 15,336
NJRES [Member] | Minimum [Member]
Long-term Purchase Commitment [Line Items]
Storage and pipeline capacity, contract term		1 year
NJRES [Member] | Maximum [Member]
Long-term Purchase Commitment [Line Items]
Storage and pipeline capacity, contract term		10 years
NJNG [Member] | Natural Gas Purchases [Member]
Long-term Purchase Commitment [Line Items]
2015		$ 12,662
2016		72,705
2017		79,911
2018		49,492
2019		50,008
Thereafter		165,917
NJNG [Member] | Storage Demand Fees [Member]
Long-term Purchase Commitment [Line Items]
2015		7,205
2016		29,032
2017		25,336
2018		15,872
2019		11,079
Thereafter		5,345
NJNG [Member] | Pipeline Demand Fees [Member]
Long-term Purchase Commitment [Line Items]
2015		12,806
2016		79,877
2017		54,358
2018		88,956
2019		90,235
Thereafter		872,460
NJNG [Member] | Natural Gas Purchases and Future Demand Fees [Member]
Long-term Purchase Commitment [Line Items]
2015		32,673
2016		181,614
2017		159,605
2018		154,320
2019		151,322
Thereafter		$ 1,043,722
[1] Does not include amounts related to intercompany asset management agreements between NJRES and NJNG.

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Minimum amount of other commitment maturing in the fifth fiscal year following the latest fiscal year for commitments not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in this taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

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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 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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