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REGULATION - ADDITIONAL INFORMATION (Details) - USD ($) $ in Thousands |  |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 28, 2023 | Jun. 01, 2023 | Apr. 12, 2023 | Mar. 30, 2023 | Feb. 22, 2023 | May 31, 2023 | Jun. 30, 2023 | Sep. 30, 2022
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  | $ 528,114 | $ 500,666
NJNG |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  | 522,858 | 495,300
Interim rate increase (decrease), amount |  |  |  | $ 28,200 |  |  |  |
Approved rate increase (decrease), amount |  |  |  | 31,400 |  |  |  |
NJNG | COVID-19 Pandemic |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  | $ 3,900 | $ 6,900
Base Rate Stipulation |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Weighted average cost of capital |  |  |  |  |  |  | 6.84% |
Approved return on equity |  |  |  |  |  |  | 9.60% |
BGSS | NJNG |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  | $ (38,600) | $ 81,900 |  |  |  |  |
BGSS | NJNG |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Interim rate increase (decrease), amount |  |  |  |  | $ (29,900) | $ (32,400) |  |
BPU | NJNG |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  | $ 3,200 |  |  |  |
Annual recovery increase | $ 740 |  |  |  |  |  |  |
BGSS Balancing | NJNG |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  | (7,400) | 9,000 |  |  |  |  |
Conservation Incentive Program | NJNG |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  | 27,500 | 10,200 |  |  |  |  |
RAC |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Interim rate increase (decrease), amount |  |  | 3,700 |  |  |  |  |
NJCEP |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Interim rate increase (decrease), amount |  |  | $ (900) |  |  |  |  |
SAVEGREEN |  |  |  |  |  |  |  |
Schedule of Regulatory Filings [Line Items] |  |  |  |  |  |  |  |
Annual recovery increase |  | $ 10,700 |  |  |  |  |  |

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