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RELATED PARTY TRANSACTIONS - DEMAND FEES (Details) - Related Party - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Related Party Transaction [Line Items] |  |  |
Demand fees expense recognized pertaining to related party agreement | $ 7,147 | $ 7,206 | $ 7,395
Demand fees payable | 875 | 859 |
NJNG to Steckman RIdge Affiliate |  |  |
Related Party Transaction [Line Items] |  |  |
Demand fees expense recognized pertaining to related party agreement | 6,319 | 6,549 | 6,663
Demand fees payable | 775 | 775 |
ES to Steckman Ridge Affiliate |  |  |
Related Party Transaction [Line Items] |  |  |
Demand fees expense recognized pertaining to related party agreement | 828 | 657 | $ 732
Demand fees payable | $ 100 | $ 84 |

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