RATES AND REGULATORY ACTIONS (Details) - South Jersey Gas Company - USD ($) $ in Millions	1 Months Ended				11 Months Ended
	Jun. 30, 2018	May 31, 2018	Apr. 30, 2018	Mar. 31, 2018	Jun. 30, 2018
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)		$ 4.5
Public utilities, requested rate increase (decrease), amount	$ 39.1
Investment requested to be recovered through SHARP		$ 100.3
New Jersey Board of Public Utilities
Schedule of Capitalization [Line Items]
Requested term (in years)				5 years
Public utilities, requested rate increase (decrease), amount				$ 195.4
Accelerated infrastructure replacement program, remaining balance					$ 60.7
Approved term (in years)		3 years
AIRP
Schedule of Capitalization [Line Items]
Public utilities, requested rate increase (decrease), amount			$ 6.6
Annual BGSS
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)		$ (4.7)
Public utilities, requested rate increase (decrease), amount	65.5
Annual CIP
Schedule of Capitalization [Line Items]
Approved rate increase (decrease)		$ 0.2
Public utilities, requested rate increase (decrease), amount	(26.4)
Energy Efficiency Tracker
Schedule of Capitalization [Line Items]
Public utilities, requested rate increase (decrease), amount	(1.6)
Universal Service Fund
Schedule of Capitalization [Line Items]
Amount of regulatory costs not yet approved, annual revenue impact	$ 0.9				$ 0.9