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COMMITMENTS AND CONTINGENT LIABILITIES, LEGAL PROCEEDINGS (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012
Site Contingency [Line Items] |  |
Site contingency, recovery from third party of environmental remediation cost | $ 20,000,000 |
Regulatory assets | 402,202,000 | 441,263,000
Minimum [Member] |  |
Site Contingency [Line Items] |  |
Litigation settlement, gross | 159,800,000 |
Maximum [Member] |  |
Site Contingency [Line Items] |  |
Litigation settlement, gross | 261,200,000 |
Enviromental remediation costs expended, net of recoveries [Member] |  |
Site Contingency [Line Items] |  |
Regulatory assets | 46,968,000 | 59,745,000
Enviromental remediation costs liability for future expenditures [Member] |  |
Site Contingency [Line Items] |  |
Regulatory assets | $ 183,600,000 | $ 182,000,000

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition Amount of the estimated recovery from third parties recorded in the period for an individual site that reduces environmental remediation expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 + Details
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