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DERIVATIVE INSTRUMENTS - VOLUME (Details)	Mar. 31, 2014 MMcf	Sep. 30, 2013 MMcf
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

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

-Section 13

-Sentence Column B

+ Details

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

X

- Details

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