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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2013
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Regulatory Assets |  |  |
Gas utility unrealized gains (losses) on derivative financial instruments contracts | $ 0.7 | $ (1.7) | $ (1.4)
Electric Utility Electric Supply Contracts |  |  |
Regulatory Assets |  |  |
Fair value of Electric Utility's electricity supply contracts | $ 0.8 | $ (4.8) | $ (6.1)

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