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RELATED PARTY TRANSACTIONS - DEMAND FEES (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Related Party Transaction [Line Items] |  |  |  |  |
Demand fees payable | $ 859 |  | $ 859 |  | $ 859
Related Party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Demand fees expense recognized pertaining to related party agreement | 1,799 | $ 1,770 | 3,678 | $ 3,597 |
Demand fees payable | 859 |  | 859 |  | 859
Related Party | NJNG to Steckman RIdge Affiliate |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Demand fees expense recognized pertaining to related party agreement | 1,585 | 1,615 | 3,240 | 3,270 |
Demand fees payable | 778 |  | 778 |  | 775
Related Party | NJRES to Steckman Ridge Affiliate |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Demand fees expense recognized pertaining to related party agreement | 214 | $ 155 | 438 | $ 327 |
Demand fees payable | $ 81 |  | $ 81 |  | $ 84

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