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NATURE OF BUSINESS (Details) shares in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2015 Customers | Sep. 29, 2015 shares | Sep. 30, 2014
Investment [Line Items] |  |  |
Total retail customers | 512,300 |  |
Steckman Ridge [Member] |  |  |
Investment [Line Items] |  |  |
Ownership interest, percent | 50.00% |  |
PennEast [Member] |  |  |
Investment [Line Items] |  |  |
Ownership interest, percent | 20.00% |  |
Iroquois [Member] |  |  |
Investment [Line Items] |  |  |
Ownership interest, percent | 5.53% |  | 5.53%
Dominion [Member] |  |  |
Investment [Line Items] |  |  |
Ownership interest exchanged (in shares) | shares |  | 1,840 |

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- Definition Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Sentence Column A + Details
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