REGULATION - REGULATORY FILINGS (Details) - USD ($) $ in Millions								4 Months Ended	9 Months Ended
	Jul. 20, 2016	Jun. 23, 2016	Jun. 01, 2016	Feb. 24, 2016	Dec. 24, 2015	Nov. 13, 2015	Oct. 15, 2015	Feb. 29, 2016	Jun. 30, 2016
Schedule of Regulatory [Line Items]
Increase in base tariff rates						$ 147.6
Requested capital investments									$ 200.0
Bill credits issued during the period								$ 61.6
Subsequent Event [Member]
Schedule of Regulatory [Line Items]
Increase in base tariff rates	$ 112.9
CIP [Member]
Schedule of Regulatory [Line Items]
Increase (decrease) in approved rate (as a percent)				0.08%
Increase (decrease) in average residential heat customer's bill (as a percent)			8.20%
BGSS [Member]
Schedule of Regulatory [Line Items]
Increase (decrease) in average residential heat customer's bill (as a percent)			(5.50%)
NJ RISE Program [Member]
Schedule of Regulatory [Line Items]
Increase (decrease) in approved rate (as a percent)							0.07%
NJCEP [Member]
Schedule of Regulatory [Line Items]
Increase (decrease) in approved rate (as a percent)					(0.80%)
USF [Member]
Schedule of Regulatory [Line Items]
Increase (decrease) in average residential heat customer's bill (as a percent)		0.20%