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RELATED PARTY TRANSACTIONS (Details) $ in Thousands		3 Months Ended	9 Months Ended
	Apr. 01, 2010 USD ($) Bcf	Sep. 30, 2014 USD ($) Bcf / d	Jun. 30, 2015 USD ($) contract	Jun. 30, 2014 USD ($)
Related Party Transaction [Line Items]
Number of asset management agreements | contract			3
NJRES to Steckman RIdge and Iroquios Affliates [Member]
Related Party Transaction [Line Items]
Demand fees expense recognized pertaining to related party agreement			$ 4,700	$ 2,200
NJRES to Steckman Ridge Affiliate
Related Party Transaction [Line Items]
Due to related parties		$ 187	162
NJRES to Iroquois Affiliate [Member]
Related Party Transaction [Line Items]
Due to related parties		389	406
NJNG to Steckman RIdge Affiliate
Related Party Transaction [Line Items]
Related party agreement term	10 years
Agreement for natural gas storage capacity between NJNG and affiliate (in bcf) | Bcf	3
Approximate annual demand fees under agreement from April 1 2010 to March 31 2020	$ 9,300
NJNG to Steckman RIdge and Iroquios Affiliates [Member]
Related Party Transaction [Line Items]
Demand fees expense recognized pertaining to related party agreement			4,700	$ 7,300
Due to related parties		$ 823	$ 848
NJNG to PennEast Affiliate [Member]
Related Party Transaction [Line Items]
Natural Gas Transportation Capacity under Precedent Agreement from NJNG with PennEast, period		15 years
Natural Gas Transportation Capacity under Precedent Agreement from NJNG with PennEast (in bcf) | Bcf / d		0.18

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