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Summary of Significant Accounting Policies - Average Composite Depreciation Rates (Details) | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Amortization period | 5 years |  |
Gas Utility |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Average composite depreciation rates | 2.20% | 2.20% | 2.20%
Electric Utility |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Average composite depreciation rates | 2.40% | 2.50% | 2.50%

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- Definition Public Utilities, Retired Property, Plant and Equipment, Amortization Period + References No definition available. + Details
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- Definition Composite depreciation rate for public utility plants in service. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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