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COMMITMENTS AND CONTINGENT LIABILITIES, LEGAL PROCEEDINGS (Details) (USD $) | 12 Months Ended |  | 12 Months Ended |  |  |  |  | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Minimum [Member] | Sep. 30, 2014 Maximum [Member] | Sep. 30, 2014 Enviromental remediation costs expended, net of recoveries [Member] | Sep. 30, 2013 Enviromental remediation costs expended, net of recoveries [Member] | Sep. 30, 2014 Enviromental remediation costs liability for future expenditures [Member] | Sep. 30, 2013 Enviromental remediation costs liability for future expenditures [Member] | Sep. 30, 2013 July 2013 SBC Filing [Member] SBC [Member]
Site Contingency [Line Items] |  |  |  |  |  |  |  |  |
Recovery period | 7 years |  |  |  |  |  |  |  |
Site contingency, recovery from third party of environmental remediation cost | $ 20,000,000 |  |  |  |  |  |  |  |
Approved rate, amount |  |  |  |  |  |  |  |  | 18,700,000
Regulatory assets | 377,575,000 | 402,202,000 |  |  | 30,916,000 | 46,968,000 | 177,000,000 | 183,600,000 |
Litigation settlement, gross |  |  | $ 151,300,000 | $ 249,800,000 |  |  |  |  |

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