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COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details) (USD $) |  |  | 6 Months Ended |  |  |  |  | 6 Months Ended
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Mar. 31, 2014 | Sep. 30, 2013 | Mar. 31, 2014 Minimum [Member] | Mar. 31, 2014 Maximum [Member] | Mar. 31, 2014 Environmental Remediation Costs Expended, Net of Recoveries [Member] | Sep. 30, 2013 Environmental Remediation Costs Expended, Net of Recoveries [Member] | Mar. 31, 2014 Environmental Remediation Costs Liability for Future Expenditures [Member] | Sep. 30, 2013 Environmental Remediation Costs Liability for Future Expenditures [Member] | Mar. 31, 2014 SBC [Member] July 2013 SBC Filing [Member]
Site Contingency [Line Items] |  |  |  |  |  |  |  |  |
Annual recovery amount approved by the Board of Public Utilities |  |  |  |  |  |  |  |  | $ 18,700,000
Regulatory assets | 368,319,000 | 402,202,000 |  |  | 32,661,000 | 46,968,000 | 183,600,000 | 183,600,000 |
Litigation settlement, gross |  |  | $ 159,800,000 | $ 261,200,000 |  |  |  |  |

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