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Rate and Regulatory Matters (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended
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Nov. 08, 2013 New Jersey Board of Public Utilities [Member] | Jun. 30, 2014 New Jersey Board of Public Utilities [Member] | May 31, 2014 New Jersey Board of Public Utilities [Member] | Aug. 19, 2014 Delware Public Service Commission [Member] Tidewater [Member] | Jul. 02, 2014 Delware Public Service Commission [Member] Tidewater [Member] | Nov. 25, 2013 Delware Public Service Commission [Member] Tidewater [Member] | Apr. 30, 2014 Delware Public Service Commission [Member] Tidewater [Member] | Sep. 30, 2014 Delware Public Service Commission [Member] Tidewater [Member] | Apr. 30, 2014 Delware Public Service Commission [Member] TESI [Member]
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |
Approved increase in annual operating revenues |  | $ 4.2 |  |  |  |  |  |  |
Originally filed increase in annual operating revenue | 10.6 |  | 3.6 |  |  | 3.9 |  |  |
Approved increase in annual operating revenue (percentage) |  |  |  |  | 6.50% |  |  |  |
Amended filed increase in annual operating revenue | 8.1 |  |  | 0.8 | 2.5 |  |  |  |
Return on equity |  | 9.75% |  |  |  |  |  |  |
Base rate amount |  | 208.6 |  |  |  |  |  |  |
Refund of previously deferred revenues |  |  |  |  |  |  |  | 0.4 |
Projected annual revenue |  |  |  |  |  |  | 0.6 |  |
Reimbursements received for preliminary survey and investigation costs |  |  |  |  |  |  |  |  | 1.9
Gain on relinguishment of CPNC |  |  |  |  |  |  |  |  | $ 0.1

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