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DERIVATIVE INSTRUMENTS - VOLUME (Details) | Dec. 31, 2012 MMcf | Sep. 30, 2012 MMcf
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NJNG [Member] | Future [Member] | Long Position [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount | 20,600 | 16,100
NJNG [Member] | Swap [Member] | Long Position [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount | 0 | 3,400
NJRES [Member] | Future [Member] | Short Position [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount | (27,100) | (28,600)
NJRES [Member] | Swap [Member] | Long Position [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount |  | 13,200
NJRES [Member] | Swap [Member] | Short Position [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount | (700) |
NJRES [Member] | Options Held [Member] | Long Position [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount | 0 | 4,400
NJRES [Member] | Physical [Member] | Short Position [Member] |  |
Derivative [Line Items] |  |
Derivative, nonmonetary notional amount | (12,400) | (3,500)

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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 + 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