XML 14 R39.htm IDEA: XBRL DOCUMENT v2.4.0.6

DERIVATIVE INSTRUMENTS - VOLUME (Details)	Dec. 31, 2012 MMcf	Sep. 30, 2012 MMcf
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)

X

- 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

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

X

- Details

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