REGULATION - REGULATORY FILINGS (Details) $ in Thousands															1 Months Ended					2 Months Ended	12 Months Ended
	Sep. 28, 2022 USD ($)	Sep. 13, 2022 USD ($)	Sep. 07, 2022 USD ($)	Aug. 17, 2022 USD ($)	Jul. 13, 2022 USD ($)	Jun. 01, 2022 USD ($)	Mar. 23, 2022 USD ($)	Jan. 26, 2022 USD ($)	Nov. 19, 2021 USD ($)	Nov. 17, 2021 USD ($)	Mar. 03, 2021 USD ($)	Sep. 25, 2020	May 29, 2020 USD ($)	Feb. 28, 2019 USD ($) lease	Nov. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Apr. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Oct. 31, 2020 USD ($)	Jan. 31, 2021 USD ($)	Sep. 30, 2022 USD ($) filing project	Sep. 30, 2021 USD ($)
Schedule of Regulatory Filings [Line Items]
Regulatory assets-noncurrent																					$ 500,666	$ 522,099
Number of interim filings during each fiscal year | filing																					2
Number of days notice for refund																					5 days
NJNG
Schedule of Regulatory Filings [Line Items]
Approved rate increase (decrease), amount					$ 28,900
Environmental Remediation Costs
Schedule of Regulatory Filings [Line Items]
Regulatory assets, amortization period																					7 years
Postemployment and Other Benefit Costs
Schedule of Regulatory Filings [Line Items]
Regulatory assets, amortization period																					7 years
Deferred Storm Damage Costs
Schedule of Regulatory Filings [Line Items]
Regulatory assets, amortization period																					7 years
Other Regulatory Asset Noncurrent, PIM
Schedule of Regulatory Filings [Line Items]
Regulatory assets, amortization period																					7 years
Regulatory assets-noncurrent																					$ 635
Base Rate Stipulation
Schedule of Regulatory Filings [Line Items]
Weighted average cost of capital																					6.84%
Approved return on equity																					9.60%
Approved equity capital structure, percentage																					54.00%
Public utilities, approved depreciation rate, percentage																					2.78%
SAVEGREEN
Schedule of Regulatory Filings [Line Items]
Public utility extension term												3 years
Capital investments approved by the BPU											$ 126,100
Financing options											109,400
Operations and maintenance expense											23,400
Annual recovery increase								$ 2,200			$ 15,600
SAVEGREEN | Minimum
Schedule of Regulatory Filings [Line Items]
Regulatory assets, amortization period																					2 years
Program recovery term																					3 years
SAVEGREEN | Maximum
Schedule of Regulatory Filings [Line Items]
Regulatory assets, amortization period																					10 years
Program recovery term																					10 years
BPU | NJNG
Schedule of Regulatory Filings [Line Items]
Program recovery term				3 years
Approved rate increase (decrease), amount			$ 3,200
Public utilities, investments				$ 500,000
BPU | NJNG
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount										$ 79,000
BGSS | NJNG
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount									$ 24,200
Interim rate increase (decrease), amount																				$ (20,600)
Interim rate increase (decrease), amount, net of tax																				$ (19,300)
BGSS | NJNG
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount						$ 81,900				2,900
BGSS Balancing | NJNG
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount						9,000				13,000
Conservation Incentive Program | NJNG
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount						$ 10,200				$ (6,300)
NJNG EE Recovery Rate | NJNG
Schedule of Regulatory Filings [Line Items]
Annual recovery increase	$ (3,500)
Approved rate increase (decrease), amount													$ 11,400
RAC
Schedule of Regulatory Filings [Line Items]
Approved rate increase (decrease), amount		$ 3,800					$ 600										$ 1,300
NJCEP
Schedule of Regulatory Filings [Line Items]
Approved rate increase (decrease), amount		$ 2,200					$ (2,900)										$ 6,000
USF
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount	$ (1,600)															$ 4,900
SAFE Program
Schedule of Regulatory Filings [Line Items]
Capital investments approved by the BPU																					$ 130,000
Capital investments approved by the BPU, period																					4 years
Capital investments to be recovered approved by the Board of Public Utilities																					$ 200,000
Recovery amount																					$ 157,500
SAFE II
Schedule of Regulatory Filings [Line Items]
Capital investments approved by the BPU, period																					5 years
NJ RISE Program
Schedule of Regulatory Filings [Line Items]
Approved return on equity																					9.75%
Program recovery term																					5 years
Number of capital investment projects | project																					6
Originally filed petition for capital investments to Board of Public Utilities																					$ 102,500
NJ RISE Program | Minimum
Schedule of Regulatory Filings [Line Items]
Approved equity capital structure, percentage																					6.74%
NJ RISE Program | Maximum
Schedule of Regulatory Filings [Line Items]
Approved equity capital structure, percentage																					6.90%
NJ RISE And SAFE II Capital Investments | NJNG
Schedule of Regulatory Filings [Line Items]
Capital investment costs																		$ 3,400
SAFE II and NJ RISE
Schedule of Regulatory Filings [Line Items]
Approved rate increase (decrease), amount															$ 269
Infrastructure Investment Program (IIP) | NJNG
Schedule of Regulatory Filings [Line Items]
Program recovery term														5 years					5 years
Number of project components | lease														2
Public utilities, investments														$ 507,000					$ 150,000