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REGULATION - ADDITIONAL INFORMATION (Details) - USD ($) $ in Thousands |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 12, 2023 | Mar. 30, 2023 | Feb. 22, 2023 | Mar. 31, 2023 | Sep. 30, 2022
Schedule of Regulatory Filings [Line Items] |  |  |  |  |
Regulatory assets |  |  |  | $ 501,829 | $ 500,666
NJNG |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |
Regulatory assets |  |  |  | $ 3,900 | $ 6,900
Interim rate increase (decrease), amount |  |  | $ (32,500) |  |
Approved rate increase (decrease), amount |  | $ 31,400 |  |  |
Base Rate Stipulation |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |
Weighted average cost of capital |  |  |  | 6.84% |
Approved return on equity |  |  |  | 9.60% |
BGSS | NJNG | Subsequent Event |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |
Requested rate increase (decrease), amount | $ 81,900 |  |  |  |
BGSS | NJNG |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |
Interim rate increase (decrease), amount |  |  | $ (29,900) |  |
BPU | NJNG |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |
Approved rate increase (decrease), amount |  | $ 3,500 |  |  |
BGSS Balancing | NJNG | Subsequent Event |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |
Requested rate increase (decrease), amount | 9,000 |  |  |  |
Conservation Incentive Program | NJNG | Subsequent Event |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |
Requested rate increase (decrease), amount | 10,200 |  |  |  |
RAC | Subsequent Event |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |
Interim rate increase (decrease), amount | 3,700 |  |  |  |
NJCEP | Subsequent Event |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |
Interim rate increase (decrease), amount | $ (900) |  |  |  |

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