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REGULATION - REGULATORY FILINGS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013
CIP [Member]
Schedule of Regulatory [Line Items]
Percent of increase (decrease) for the average residential heating customer	(1.00%)
Annual recovery amount increase approved by the Board of Public Utilities	$ 7.4
BGSS [Member]
Schedule of Regulatory [Line Items]
Percent of increase (decrease) for the average residential heating customer	(6.00%)
Annual recovery amount increase (decrease) proposed to the board of public utilities	29.4
June 2013 USF Filing [Member] \| USF [Member]
Schedule of Regulatory [Line Items]
Percent of increase (decrease) for the average residential heating customer	(0.50%)
Annual recovery amount increase approved by the Board of Public Utilities	3.8
July 2013 SBC Filing [Member] \| SBC [Member]
Schedule of Regulatory [Line Items]
Percent of increase (decrease) for the average residential heating customer	1.70%
Annual recovery amount increase approved by the Board of Public Utilities	12.9
Reduction in RA factor	$ 18.7