REGULATION - REGULATORY FILINGS (Details) - USD ($) $ in Thousands							3 Months Ended	4 Months Ended
	Jun. 25, 2020	May 29, 2020	Mar. 30, 2020	Mar. 16, 2020	Nov. 15, 2019	Nov. 01, 2019	Jun. 30, 2020	Jul. 24, 2020
NJNG EE Recovery Rate | NJNG
Schedule of Regulatory Filings [Line Items]
Approved rate increase (decrease), amount						$ 11,300
Base Rate Stipulation
Schedule of Regulatory Filings [Line Items]
Approved rate increase (decrease), amount					$ 62,200
Approved rate increase (decrease)					6.95%
Approved return on equity					9.60%
Approved equity capital structure, percentage					54.00%
Approved depreciation rate					2.78%
RAC | NJNG
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount				$ 1,200
NJCEP | NJNG
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount				$ (600)
NJ RISE And SAFE II Capital Investments | NJNG
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount			$ 7,400
Capital investment costs							$ 57,900
BGSS | NJNG
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount		$ (20,400)
BGSS Balancing | NJNG
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount		(3,900)
Conservation Incentive Program | NJNG
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount		22,300
BPU | NJNG
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount		$ (70)
June 2020 Annual U S F Compliance Filing | NJNG
Schedule of Regulatory Filings [Line Items]
Requested rate increase (decrease), amount	$ (400)
Subsequent Event | NJ RISE And SAFE II Capital Investments | NJNG
Schedule of Regulatory Filings [Line Items]
Approved rate increase (decrease), amount								$ 7,100
Capital investment costs								$ 55,100