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Utility Regulatory Assets and Liabilities and Regulatory Matters (Details) (USD $) In Millions, unless otherwise specified |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Apr. 30, 2013 | Sep. 30, 2014 Minimum | Sep. 30, 2014 Maximum | Sep. 30, 2014 Removal Costs, Net Maximum | Sep. 30, 2014 Other Regulatory Assets (Liabilities) [Member] Minimum | Sep. 30, 2014 Other Regulatory Assets (Liabilities) [Member] Maximum
Regulatory Assets and Liabilities |  |  |  |  |  |  |  |
Average remaining depreciable lives of the associated property |  |  |  | 1 year | 65 years |  |  |
Unrealized gains (losses) on derivative financial instruments contracts | $ (1.4) | $ (1.7) |  |  |  |  |  |
Fair value of electric utility electricity supply contracts | 0.3 | (4.8) |  |  |  |  |  |
Period to recover costs related to other regulatory assets |  |  |  |  |  | 5 years | 1 year | 20 years
Net Book Value of Asset Transferred |  |  | $ 2.6 |  |  |  |  |

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- Definition Average remaining depreciable lives of associated property. + References No definition available. + Details
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- Definition Fair value of electric utility electricity supply contracts. + References No definition available. + Details
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- Definition Unrealized gains or losses on derivative financial instruments contracts. + References No definition available. + Details
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- Definition Period to recover costs related to regulatory assets. + References No definition available. + Details
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- Details
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