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REGULATION, REGULATORY FILINGS (Details) (USD $) | 12 Months Ended |  | 1 Months Ended |  |  |  |  | 12 Months Ended | 4 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2012 | Sep. 30, 2013 | Oct. 31, 2014 Subsequent Event [Member] | Sep. 30, 2014 Other Regulatory Asset Noncurrent [Member] | Sep. 30, 2013 Other Regulatory Asset Noncurrent [Member] | Sep. 30, 2014 Other Regulatory Asset Noncurrent, PIM [Member] | Sep. 30, 2014 Storm Costs [Member] | Sep. 30, 2013 Storm Costs [Member] | Sep. 30, 2014 SAVEGREEN [Member] | Sep. 30, 2014 SAVEGREEN [Member] June 2012 SAVEGREEN Filing [Member] | Sep. 30, 2014 SAVEGREEN-Incentives [Member] | Sep. 30, 2014 SAVEGREEN-Incentives [Member] June 2012 SAVEGREEN Filing [Member] | Sep. 30, 2014 CIP [Member] | Sep. 30, 2013 CIP [Member] | Sep. 30, 2013 BGSS [Member] | Sep. 30, 2014 BGSS [Member] | Oct. 31, 2014 BGSS [Member] Subsequent Event [Member] | Sep. 30, 2014 AIP I and AIP II [Member] | Sep. 30, 2014 AIP I [Member] | Sep. 30, 2014 AIP II [Member] | Sep. 30, 2014 SAFE-Safety Acceleration and Facility Enhancement Program [Member] | Sep. 30, 2014 Compressed Natural Gas Vehicle Refueling Stations [Member] | Sep. 30, 2014 NJ RISE Program [Member] project | Sep. 30, 2013 USF [Member] June 2012 USF Filing [Member] | Sep. 30, 2014 USF [Member] June 2013 USF Filing [Member] | Oct. 31, 2014 USF [Member] Subsequent Event [Member] June 2014 USF Filing [Member] | Sep. 30, 2013 SBC [Member] July 2013 SBC Filing [Member] | Sep. 30, 2014 SBC [Member] September 2014 SBC Filing [Member] | Sep. 30, 2014 New Jersey Clean Energy Program [Member] | Jun. 30, 2013 New Jersey Clean Energy Program [Member] | Jun. 30, 2014 New Jersey Clean Energy Program [Member] | Sep. 30, 2014 New Jersey Clean Energy Program [Member] July 2013 SBC Filing [Member] | Sep. 30, 2014 New Jersey Clean Energy Program [Member] September 2014 SBC Filing [Member] | Sep. 30, 2014 Minimum [Member] SAVEGREEN [Member] June 2012 SAVEGREEN Filing [Member] | Sep. 30, 2014 Minimum [Member] SAVEGREEN-Incentives [Member] June 2012 SAVEGREEN Filing [Member] | Sep. 30, 2014 Maximum [Member] SAVEGREEN [Member] June 2012 SAVEGREEN Filing [Member] | Sep. 30, 2014 Maximum [Member] SAVEGREEN-Incentives [Member] June 2012 SAVEGREEN Filing [Member]
Schedule of Regulatory [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Program recovery term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  | 2 years | 2 years | 10 years | 10 years
Regulatory asset, maximum amount to be recorded annually |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, expense benchmark |  |  |  |  | 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets, threshold of recording regulatory liability when net liability exceeds amount |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets, noncurrent | 377,575,000 |  | 402,202,000 |  | 6,797,000 | 14,656,000 | 3,800,000 | 15,207,000 | 14,822,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liability, amortization period | 48 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | (1.00%) | 2.40% |  |  | (4.30%) |  |  |  |  |  |  | (0.10%) | (0.50%) | 0.40% |  |  |  |  |  | 1.90% |  |  |  |  |
Interim rate increase (decrease), percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5.20%) | (6.00%) | (5.00%) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total investment |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 148,700,000 |  |  |  | 5,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in the RA factor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved equity capital structure, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.76% | 7.12% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.30% |  |  | 9.75% | 10.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investments approved by the Board of Public Utilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130,000,000 | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average cost of capital |  |  |  |  |  |  |  |  |  |  |  |  | 6.90% |  |  |  |  |  |  |  |  | 6.90% | 7.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utility annual rate for allowance for funds used during construction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of capital investment projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Originally filed petition for capital investments to Board of Public Utilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 102,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery amount approved by the Board of Public Utilities |  |  |  |  |  |  |  |  |  |  | 85,000,000 | 93,100,000 | 17,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory costs approved |  | 308,000 |  |  |  |  |  |  |  | 52,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest-free loans |  |  |  |  |  |  |  |  |  | 38,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in tariff rider rate approved by the Board of Public Utilities |  |  |  |  |  |  |  |  |  |  |  |  | 1.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual recovery amount approved by the Board of Public Utilities |  |  |  |  |  |  |  |  |  |  |  |  | 12,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of increase (decrease) for the average residential heating customer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.20%) |  |  |  |  |  |  |  |  |  |
Approved rate, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,700,000 |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3.00%) |  |  |  |  |  |  |  |  |
Requested rate, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,500,000 |  |  |  |  | 16,300,000 |  |  |  |
Increase in regulatory funding obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,600,000 | 9,800,000 | 15,600,000 |  |  |  |  |  |
Debt instrument, term | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum issuance amount | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum maturity period | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, renewal period | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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