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COMMITMENTS AND CONTINGENT LIABILITIES - LEGAL PROCEEDINGS (Details) (USD $) | 0 Months Ended |  |  | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 20, 2013 | Mar. 31, 2013 | Sep. 30, 2012 | Mar. 31, 2013 Minimum [Member] | Mar. 31, 2013 Maximum [Member] | Mar. 31, 2013 Environmental remediation costs expended, net of recoveries [Member] | Sep. 30, 2012 Environmental remediation costs expended, net of recoveries [Member] | Mar. 31, 2013 Environmental remediation costs liability for future expenditures [Member] | Sep. 30, 2012 Environmental remediation costs liability for future expenditures [Member]
Site Contingency [Line Items] |  |  |  |  |  |  |  |  |
Site contingency, recovery from third party of environmental remediation cost | $ 20,000,000 |  |  |  |  |  |  |  |
Regulatory assets |  | 442,208,000 | 441,263,000 |  |  | 48,830,000 | 59,745,000 | 182,000,000 | 182,000,000
Litigation settlement, gross |  |  |  | $ 159,600,000 | $ 266,400,000 |  |  |  |

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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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 9, 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 AICPA -Name Statement of Position (SOP) -Number 96-1 -Paragraph 163 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 3: 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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