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REGULATION - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions								9 Months Ended
	Jun. 27, 2025	May 30, 2025	Apr. 23, 2025	Dec. 18, 2024	Dec. 17, 2024	Nov. 21, 2024	Oct. 30, 2024	Jun. 30, 2025
Schedule of Regulatory Filings [Line Items]
Annual recoveries							$ 12.3
Base Rate Stipulation
Schedule of Regulatory Filings [Line Items]
Weighted average cost of capital, percentage						7.08%		7.08%
Approved return on equity, percentage						9.60%
BPU
Schedule of Regulatory Filings [Line Items]
Approved return on equity, percentage								9.60%
Total amount							385.6
Approved equity capital structure, percentage						54.00%
Public utilities, approved depreciation rate, percentage						3.21%
BPU | NJNG
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount	$ (0.5)
BPU | NJNG
Schedule of Regulatory Filings [Line Items]
Approved rate increase (decrease), amount						$ 157.0
Investment					$ 700.0
Program term					3 years
SAVEGREEN
Schedule of Regulatory Filings [Line Items]
Capital investments approved by the BPU				$ 3.1			205.0
Financing options							160.5
Operations and maintenance expense							$ 20.1
SAVEGREEN | NJNG
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount		$ 17.3
RAC
Schedule of Regulatory Filings [Line Items]
Approved rate increase (decrease), amount			$ 2.4
NJCEP
Schedule of Regulatory Filings [Line Items]
Approved rate increase (decrease), amount			$ 1.6
BGSS
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount		63.3
BGSS Balancing
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount		6.1
Conservation Incentive Program
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount		$ (25.5)

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