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DERIVATIVE INSTRUMENTS - VOLUME (Details) | Mar. 31, 2014 MMcf | Sep. 30, 2013 MMcf
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NJNG [Member] | Futures [Member] | Long Position [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount | 27,500 | 22,600
NJRES [Member] | Futures [Member] | Short Position [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount | (20,900) | (64,200)
NJRES [Member] | Options [Member] | Long Position [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount | 0 | 1,500
NJRES [Member] | Physical [Member] | Long Position [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount | 31,000 | 7,300

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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
Name: | invest_DerivativeNonmonetaryNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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