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INVESTMENTS IN EQUITY METHOD INVESTEES (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jun. 30, 2018 USD ($) mi | Sep. 30, 2017 USD ($)
Schedule of Equity Method Investments [Line Items] |  |
Investments in equity investees | $ 187,808 | $ 172,585
Steckman Ridge |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in equity investees | 117,639 | 120,262
Steckman Ridge | Equity Method Investee |  |
Schedule of Equity Method Investments [Line Items] |  |
Total outstanding principal balance of loans | 70,400 | 70,400
PennEast |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in equity investees | $ 70,169 | $ 52,323
Construction plan, project area (in miles) | mi | 120 |

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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