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DERIVATIVE INSTRUMENTS - VOLUME (Details) $ in Millions		Dec. 31, 2015 USD ($) Bcf	Sep. 30, 2015 USD ($) Bcf	Jun. 01, 2015 USD ($)
Derivative [Line Items]
Notional amount | $				$ 125
Treasury Lock [Member]
Derivative [Line Items]
Notional amount | $		$ 125	$ 125
NJNG [Member] | Futures [Member] | Long [Member]
Derivative [Line Items]
Volume (Bcf)	[1]	19.5	25.8
NJRES [Member] | Futures [Member] | Short [Member]
Derivative [Line Items]
Volume (Bcf)		(120.8)	(91.1)
NJRES [Member] | Options [Member] | Long [Member]
Derivative [Line Items]
Volume (Bcf)		5.8	1.2
NJRES [Member] | Physical [Member] | Long [Member]
Derivative [Line Items]
Volume (Bcf)		111.7	48.2
[1] Not included is the notional amount of $125 million related to NJNG’s treasury lock agreement.

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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

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
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- Definition

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