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Utility Regulatory Assets and Liabilities and Regulatory Matters (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014
Minimum |  |
Regulatory Assets and Liabilities |  |
Average remaining depreciable lives of the associated property | 1 year |
Maximum |  |
Regulatory Assets and Liabilities |  |
Average remaining depreciable lives of the associated property | 65 years |
Environmental Costs |  |
Regulatory Assets and Liabilities |  |
Regulatory asset, amortization period | 5 years |
Gas Utility |  |
Regulatory Assets and Liabilities |  |
Fair value of unrealized gains (losses) | $ 3.3 | $ 1.4
Electric Utility Electric Supply Contracts |  |
Regulatory Assets and Liabilities |  |
Fair value of unrealized gains (losses) | $ (0.5) | $ 0.3
Removal Costs, Net | Maximum |  |
Regulatory Assets and Liabilities |  |
Regulatory asset, amortization period | 5 years |
Other Regulatory Assets | Minimum |  |
Regulatory Assets and Liabilities |  |
Regulatory asset, amortization period | 1 year |
Other Regulatory Assets | Maximum |  |
Regulatory Assets and Liabilities |  |
Regulatory asset, amortization period | 20 years |

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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 + Details
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- Definition Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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