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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, INVESTMENT IN EQUITY INVESTEES (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  | 3 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 PennEast [Member] Investor | Oct. 31, 2014 Subsequent Event [Member] | Oct. 31, 2014 Subsequent Event [Member] PennEast [Member] Investor
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Restricted cash and cash equivalents | $ 1.0 | $ 1.1 |  |  |
Capital investment total cost |  |  |  | 1,000.0 |
Number of investors |  |  | 4 |  | 6
Ownership interest, percent |  |  |  |  | 20.00%
Asset impairment charges | $ 6.4 |  |  |  |

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