INVESTMENTS IN EQUITY INVESTEES, SCHEDULE OF COST METHOD INVESTMENTS (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013 OwnEnergy [Member]	Sep. 30, 2012 OwnEnergy [Member]	Oct. 11, 2013 Two Dot Wind Project in Montana [Member] Subsequent Event [Member] MWh
Schedule of Cost-method Investments [Line Items]
Cost method investments		$ 8.8	$ 22.0
Cost method investment, ownership percentage	18.70%	19.90%
Number of megawatts of the wind project			9.7

Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 325

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-URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594

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