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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, SALES TAX ACCOUNTING (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Accounting Policies [Abstract] |  |  |  |  |  |
Sales tax | $ 47.4 |  | $ 44.4 |  | $ 32.3 |
TEFA | 1.4 | [1] | 5.0 | [1] | 6.0 | [1]
Total | $ 48.8 |  | $ 49.4 |  | $ 38.3 |
[1] | TEFA was phased out in January 2014.

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- Definition Sales Tax, Excise Tax, and Assessments + References No definition available. + Details
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- Definition The excise taxes collected by a public utility and reported in revenues if the amount of excise taxes is equal to 1 percent or more of such total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph e -Article 5 + Details
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