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RELATED PARTY TRANSACTIONS (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2010 USD ($) Bcf | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) Bcf / d contract | Jun. 30, 2018 USD ($) | Sep. 30, 2018 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |
Demand fees expense recognized pertaining to related party agreement |  | $ 2,126 | $ 2,156 | $ 6,455 | $ 6,392 |
Demand fees payable |  | 1,150 |  | $ 1,150 |  | $ 1,150
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 |  | 1,431 | 1,451 | $ 4,349 | 4,306 |
Demand fees payable |  | 775 |  | 775 |  | 775
NJRES to Steckman Ridge Affiliate |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Demand fees expense recognized pertaining to related party agreement |  | 695 | $ 705 | 2,106 | $ 2,086 |
Demand fees payable |  | $ 375 |  | $ 375 |  | $ 375
NJNG to PennEast Affiliate |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Transportation precedent agreement, period |  |  |  | 15 years |  |
Transportation capacity under precedent agreement with PennEast (in bcf per day) | Bcf / d |  |  |  | 0.18 |  |
NJRES to PennEast Affiliate |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Transportation precedent agreement, period |  |  |  | 5 years |  |
Transportation capacity under precedent agreement with PennEast (in bcf per day) | Bcf / d |  |  |  | 0.05 |  |

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