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REGULATION, REGULATORY FILINGS (Details) (USD $) | 12 Months Ended |  | 3 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended |  |  | 12 Months Ended | 2 Months Ended
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Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2013 BGSS [Member] | Sep. 30, 2013 BGSS [Member] | Sep. 30, 2012 BGSS [Member] | Sep. 30, 2014 CIP [Member] | Sep. 30, 2012 CIP [Member] | Sep. 30, 2013 SAFE-Safety Acceleration and Facility Enhancement Program [Member] | Sep. 30, 2013 SAVEGREEN [Member] | Sep. 30, 2013 SAVEGREEN-Incentives [Member] | Jun. 30, 2013 SBC [Member] | Sep. 30, 2013 SBC [Member] | Sep. 30, 2013 AIP I and AIP II [Member] | Sep. 30, 2012 AIP I and AIP II [Member] | Sep. 30, 2013 AIP II [Member] | Sep. 30, 2012 AIP II [Member] | Sep. 30, 2013 AIP I [Member] | Sep. 30, 2009 AIP I [Member] | Sep. 30, 2013 Compressed Natural Gas Vehicle Refueling Stations [Member] | Sep. 30, 2013 NJ RISE Program [Member] | Sep. 30, 2013 Storm Costs [Member] | Sep. 30, 2012 Storm Costs [Member] | Sep. 30, 2013 June 2011 SAVEGREEN Filing [Member] SAVEGREEN-Incentives [Member] | Sep. 30, 2013 June 2012 SAVEGREEN Filing [Member] | Sep. 30, 2013 June 2012 SAVEGREEN Filing [Member] SAVEGREEN-Incentives [Member] | Sep. 30, 2013 June 2012 USF Filing [Member] USF [Member] | Sep. 30, 2013 June 2013 USF Filing [Member] USF [Member] | Sep. 30, 2013 July 2013 SBC Filing [Member] SBC [Member] | Nov. 21, 2013 Regulatory Filing [Member] BGSS [Member]
Schedule of Regulatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer refunds and bill credits |  |  |  |  | $ (85,900,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of increase (decrease) for the average residential heating customer |  |  | (5.20%) | (3.60%) | (9.10%) | (1.00%) | 2.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.10%) | 0.50% | 1.70% | (6.00%)
Reduction in RA factor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,700,000 |
Public utilities, approved rate increase (decrease), amount |  |  |  |  |  |  | (3,000,000) |  |  |  |  |  | 6,500,000 | 4,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investments approved by the Board of Public Utilities |  |  |  |  |  |  |  | 130,000,000 |  |  |  |  |  |  |  | 60,200,000 |  | 70,800,000 | 10,000,000 |  |  |  |  |  |  |  |  |  |
Public utilities, approved equity capital structure, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.12% |  | 7.76% |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, requested rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  |  |  | 6,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual recovery amount proposed to the Public Utility Regulatory Authority |  |  |  |  |  |  |  |  |  |  |  |  | 15,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Originally filed petition for capital investments to Board of Public Utilities |  |  |  |  |  |  |  | 204,000,000 |  |  |  |  |  |  |  |  |  |  |  | 102,500,000 |  |  |  |  |  |  |  |  |
Weighted average cost of capital |  |  |  |  |  |  |  | 6.90% |  |  |  |  |  |  |  |  |  |  | 7.10% |  |  |  | 7.10% |  | 6.90% |  |  |  |
Increase in tariff rider rate approved by the Board of Public Utilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.70% |  |  |  |  |
Annual recovery amount approved by the Board of Public Utilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,000,000 |  |  |  |  |
Increase in regulatory funding obligations |  |  |  |  |  |  |  |  |  |  | 9,800,000 | 15,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utility annual rate for allowance for funds used during construction |  |  |  |  |  |  |  | 6.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery amount approved by the Board of Public Utilities |  |  |  |  |  |  |  |  | 56,400,000 | 93,100,000 |  |  |  |  |  |  |  |  |  |  |  |  | 10,400,000 | 85,000,000 | 17,300,000 |  |  |  |
Interest-free loans |  |  |  |  |  |  |  |  | 19,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory costs approved | 308,000 |  |  |  |  |  |  |  | 41,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on equity |  |  |  |  |  |  |  | 9.75% |  |  |  |  |  |  |  |  |  |  | 10.30% |  |  |  | 10.30% |  |  |  |  |  |
Total investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,500,000 |  |  |  |  |  |  |  |  |  |
Regulatory assets, noncurrent | $ 441,263,000 | $ 402,202,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,822,000 | $ 0 |  |  |  |  |  |  |

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