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COMMITMENTS AND CONTINGENT LIABILITIES, SCHEDULE OF FUTURE COMMITTED EXPENSES (Details) (USD $) | 12 Months Ended
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Sep. 30, 2013
Long-term Purchase Commitment [Line Items] |  |
Current charges recoverable through BGSS | $ 96,000,000 |
2014 | 512,077,000 | [1]
2015 | 227,634,000 | [1]
2016 | 89,395,000 | [1]
2017 | 56,884,000 | [1]
2018 | 52,771,000 | [1]
Thereafter | 214,324,000 | [1]
Natural Gas Purchases [Member] | NJRES [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2014 | 238,843,000 |
2015 | 31,282,000 |
2016 | 15,513,000 |
2017 | 0 |
2018 | 0 |
Thereafter | 0 |
Natural Gas Purchases [Member] | NJNG [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2014 | 104,466,000 |
2015 | 100,487,000 |
2016 | 8,564,000 |
2017 | 113,000 |
2018 | 0 |
Thereafter | 0 |
Storage Demand Fees [Member] | NJRES [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2014 | 28,613,000 |
2015 | 12,017,000 |
2016 | 7,114,000 |
2017 | 5,035,000 |
2018 | 3,318,000 |
Thereafter | 4,000,000 |
Storage Demand Fees [Member] | NJNG [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2014 | 29,082,000 |
2015 | 22,158,000 |
2016 | 12,396,000 |
2017 | 9,993,000 |
2018 | 9,299,000 |
Thereafter | 13,948,000 |
Pipeline Demand Fees [Member] | NJRES [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2014 | 44,277,000 |
2015 | 20,364,000 |
2016 | 10,046,000 |
2017 | 8,303,000 |
2018 | 6,983,000 |
Thereafter | 2,783,000 |
Pipeline Demand Fees [Member] | NJNG [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2014 | 66,796,000 |
2015 | 41,326,000 |
2016 | 35,762,000 |
2017 | 33,440,000 |
2018 | 33,171,000 |
Thereafter | 193,593,000 |
Natural Gas Purchases and Future Demand Fees [Member] | NJRES [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2014 | 311,733,000 |
2015 | 63,663,000 |
2016 | 32,673,000 |
2017 | 13,338,000 |
2018 | 10,301,000 |
Thereafter | 6,783,000 |
Natural Gas Purchases and Future Demand Fees [Member] | NJNG [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
2014 | 200,344,000 |
2015 | 163,971,000 |
2016 | 56,722,000 |
2017 | 43,546,000 |
2018 | 42,470,000 |
Thereafter | $ 207,541,000 |
[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 + References No definition available. + Details
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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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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