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RELATED PARTY TRANSACTIONS (Details) $ in Thousands		3 Months Ended
	Apr. 01, 2010 USD ($) Bcf	Dec. 31, 2017 USD ($) Bcf / d contract	Dec. 31, 2016 USD ($)	Sep. 30, 2017 USD ($)
Related Party Transaction [Line Items]
Demand fees expense recognized pertaining to related party agreement		$ 2,149	$ 2,111
Demand fees payable		$ 1,150		$ 1,152
Number of asset management agreements | contract		4
NJNG to NJRES Affilate
Related Party Transaction [Line Items]
Asset management agreement, period	10 years
NJNG to Steckman RIdge Affiliate
Related Party Transaction [Line Items]
Natural gas sold at cost under asset management agreement (in Bcf) | Bcf	3
Approximate annual demand fees under agreement	$ 9,300
Demand fees expense recognized pertaining to related party agreement		$ 1,448	1,410
Demand fees payable		775		775
NJRES to Steckman Ridge Affiliate
Related Party Transaction [Line Items]
Demand fees expense recognized pertaining to related party agreement		701	$ 701
Demand fees payable		$ 375		$ 377
NJNG to PennEast Affiliate
Related Party Transaction [Line Items]
Transportation precedent agreement, period		15 years
Transportation capacity under precedent agreement from NJNG with PennEast (in bcf per day) | Bcf / d		0.18

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Carrying amount as of the balance sheet date of obligations due all related parties.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
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