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RELATED PARTY TRANSACTIONS - DEMAND FEES (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Sep. 30, 2022
Related Party Transaction [Line Items] |  |  |  |  |
Demand fees payable | $ 856 |  | $ 856 |  | $ 851
Related Party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Demand fees expense recognized pertaining to related party agreement | 1,870 | $ 1,838 | 5,467 | $ 5,567 |
Demand fees payable | 856 |  | 856 |  | 851
Related Party | NJNG to Steckman RIdge Affiliate |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Demand fees expense recognized pertaining to related party agreement | 1,703 | 1,651 | 4,973 | 5,015 |
Demand fees payable | 775 |  | 775 |  | 775
Related Party | NJRES to Steckman Ridge Affiliate |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Demand fees expense recognized pertaining to related party agreement | 167 | $ 187 | 494 | $ 552 |
Demand fees payable | $ 81 |  | $ 81 |  | $ 76

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