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RELATED PARTY TRANSACTIONS (Details) DTH in Thousands, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2010 USD ($) Bcf | Sep. 30, 2020 USD ($) DTH lease Bcf | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Related Party Transaction [Line Items] |  |  |  |
Demand fees recognized pertaining to related party agreement |  | $ 6,083 | $ 7,948 | $ 8,505
Due to related parties |  | $ 791 | 790 |
Number of asset management agreements | lease |  | 3 |  |
NJNG to NJRES Affiliate |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Asset management agreement, period | 5 years |  |  |
NJNG to Steckman RIdge Affiliate - National Gas Distribution |  |  |  |
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 recognized pertaining to related party agreement |  | $ 5,900 | 5,814 | 5,730
Due to related parties |  | $ 775 | 775 |
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 Dths per day) | DTH |  | 180 |  |
NJRES to PennEast Affiliate |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Transportation precedent agreement, period |  | 5 years |  |
NJRES to Steckman Ridge Affiliate - Energy Services |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Demand fees recognized pertaining to related party agreement |  | $ 183 | 2,134 | $ 2,775
Due to related parties |  | $ 16 | $ 15 |
Leaf River Energy Center LLC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Natural gas sold at cost under asset management agreement (in Bcf) | Bcf |  | 3 |  |
Storage capacity agreement term |  | 5 years |  |

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