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COMMITMENTS AND CONTINGENT LIABILITIES, LEGAL PROCEEDINGS (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Jul. 31, 2013 | Feb. 28, 2012 | Sep. 30, 2015
Site Contingency [Line Items] |  |  |  |
Recovery period |  |  |  | 7 years
Site contingency, recovery from third party of environmental remediation cost |  |  | $ 20,000 |
Regulatory assets | $ 377,575 |  |  | $ 410,155
Minimum [Member] |  |  |  |
Site Contingency [Line Items] |  |  |  |
Litigation settlement, gross |  |  |  | 150,900
Maximum [Member] |  |  |  |
Site Contingency [Line Items] |  |  |  |
Litigation settlement, gross |  |  |  | 242,100
Enviromental remediation costs expended, net of recoveries [Member] |  |  |  |
Site Contingency [Line Items] |  |  |  |
Regulatory assets | 30,916 |  |  | 18,886
Environmental Restoration Costs, Liability for Future Expenditures [Member] |  |  |  |
Site Contingency [Line Items] |  |  |  |
Regulatory assets | 177,000 |  |  | $ 180,400
July 2013 SBC Filing [Member] | SBC [Member] |  |  |  |
Site Contingency [Line Items] |  |  |  |
Approved rate, amount |  | $ 18,700 |  |
September 2014 SBC Filing [Member] | SBC [Member] |  |  |  |
Site Contingency [Line Items] |  |  |  |
Requested rate, amount | $ 8,500 |  |  |

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