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RELATED PARTY TRANSACTIONS (Details) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 19, 2021 DTH | Apr. 01, 2020 USD ($) Bcf | Apr. 01, 2010 | Mar. 31, 2021 | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) DTH lease Bcf | Jun. 30, 2020 USD ($) | Sep. 30, 2020 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Demand fees expense recognized pertaining to related party agreement |  |  |  |  | $ 1,700 | $ 1,518 | $ 5,163 | $ 4,548 |
Demand fees payable |  |  |  |  | 863 |  | $ 863 |  | $ 791
Number of asset management agreements | lease |  |  |  |  |  |  | 2 |  |
NJNG to NJRES Affiliate |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Asset management agreement, period |  |  | 5 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 |  |  |  |  | 1,687 | 1,491 | $ 4,760 | 4,462 |
Demand fees payable |  |  |  |  | 776 |  | 776 |  | 775
NJRES to Steckman Ridge Affiliate |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Demand fees expense recognized pertaining to related party agreement |  |  |  |  | 13 | $ 27 | 403 | $ 86 |
Demand fees payable |  |  |  |  | $ 87 |  | $ 87 |  | $ 16
NJNG to PennEast Affiliate |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Natural gas transportation capacity agreement, period |  |  |  |  |  |  | 15 years |  |
Transportation capacity under precedent agreement with PennEast (in bcf per day) | DTH |  |  |  |  |  |  | 180,000 |  |
NJRES to PennEast Affiliate |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Natural gas transportation capacity agreement, period |  |  |  |  |  |  | 5 years |  |
Transportation capacity under precedent agreement with PennEast (in bcf per day) | DTH |  |  |  |  |  |  | 50,000 |  |
NJN G to Adelphia Affiliate |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Transportation capacity under precedent agreement with PennEast (in bcf per day) | DTH |  |  |  |  |  |  | 130,000 |  |
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 |  |
Storage capacity park and loan agreement | DTH | 330,000 |  |  |  |  |  |  |  |
NJNG and Clean Energy Ventures to PPA |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Sublease agreement term |  |  |  | 15 years |  |  |  |  |

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