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RELATED PARTY TRANSACTIONS (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 USD ($) Bcf / d | Sep. 30, 2015 USD ($) contract Bcf | Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($)
Related Party Transaction [Line Items] |  |  |  |
Approximate annual demand fees under agreement from April 1 2010 to March 31 2020 |  | $ 9,300 |  |
Number of asset management agreements | contract |  | 3 |  |
NJRES to Steckman Ridge and Iroquios Affiliates [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Demand fees recognized pertaining to related party agreement |  | $ 6,600 | $ 6,200 | $ 6,100
NJRES to Steckman Ridge Affiliate [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Due to related parties | $ 187 | 375 | 187 |
NJRES to Iroquois Affiliate [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Due to related parties | 389 | $ 403 | 389 |
NJNG to NJRES Affilate [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Asset management agreement, period |  | 10 years |  |
Natural gas sold at cost under asset management agreement (in Bcf) | Bcf |  | 3 |  |
NJNG to Steckman RIdge and Iroquios Afffiliates [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Demand fees recognized pertaining to related party agreement |  | $ 6,300 | 6,400 | $ 5,900
NJNG to Steckman RIdge Affiliate [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Due to related parties | 775 | 775 | 775 |
NJNG to Iroquois Affiliate [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Due to related parties | $ 48 | $ 48 | $ 48 |
NJNG to PennEast Affiliate [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Transportation precedent agreement, period | 15 years |  |  |
Transportation capacity under precedent agreement from NJNG with PennEast (MMcf) | Bcf / d | 0.18 |  |  |

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