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DERIVATIVE INSTRUMENTS - VOLUME (Details) | Mar. 31, 2013 MMcf | Sep. 30, 2012 MMcf
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NJNG [Member] | Future [Member] | Long Position [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, nonmonetary notional amount | 20,000 |  | 16,100 |
NJNG [Member] | Swap [Member] | Long Position [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, nonmonetary notional amount | 0 | [1] | 3,400 | [1]
NJNG [Member] | Options Held [Member] | Long Position [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, nonmonetary notional amount | 1,800 |  | 0 |
NJRES [Member] | Future [Member] | Long Position [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, nonmonetary notional amount | 1,500 |  |  |
NJRES [Member] | Future [Member] | Short Position [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, nonmonetary notional amount |  |  | (28,600) |
NJRES [Member] | Swap [Member] | Long Position [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, nonmonetary notional amount | 0 | [1] | 13,200 | [1]
NJRES [Member] | Options Held [Member] | Long Position [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, nonmonetary notional amount | 0 |  | 4,400 |
NJRES [Member] | Physical [Member] | Long Position [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, nonmonetary notional amount | 61,800 |  |  |
NJRES [Member] | Physical [Member] | Short Position [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, nonmonetary notional amount |  |  | (3,500) |
[1] | In October 2012, following the implementation of Dodd-Frank, ICE converted its cleared energy “swap” contracts to “futures” contracts and the NYMEX amended their product titles to remove the word “swap” from the titles of their “futures” and “option” contracts.

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Namespace Prefix: | invest_
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Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration