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RELATED PARTY TRANSACTIONS (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2010 USD ($) Bcf | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2017 USD ($) Bcf / d contract | Mar. 31, 2016 USD ($) | Sep. 30, 2016 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |
Demand fees expense recognized pertaining to related party agreement |  | $ 2,072 | $ 2,077 | $ 4,183 | $ 4,151 |
Demand fees payable |  | 1,156 |  | $ 1,156 |  | $ 1,150
Number of asset management agreements | contract |  |  |  | 3 |  |
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 |  | 1,383 | 1,385 | $ 2,793 | 2,774 |
Demand fees payable |  | 780 |  | 780 |  | 775
NJRES to Steckman Ridge Affiliate |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Demand fees expense recognized pertaining to related party agreement |  | 689 | $ 692 | 1,390 | $ 1,377 |
Demand fees payable |  | $ 376 |  | $ 376 |  | $ 375
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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