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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2018
Accounting Policies [Abstract] |
Shares Used in Computing Basic and Diluted Earnings Per Share | In the following table, we present shares used in computing basic and diluted earnings per share for Fiscal 2018, Fiscal 2017 and Fiscal 2016:
(Thousands of shares) |  | 2018 |  | 2017 |  | 2016
Weighted-average common shares outstanding for basic computation |  | 173,908 |  |  | 173,662 |  |  | 173,154 |
Incremental shares issuable for stock options and common stock awards (a) |  | 2,997 |  |  | 3,497 |  |  | 2,418 |
Weighted-average common shares outstanding for diluted computation |  | 176,905 |  |  | 177,159 |  |  | 175,572 |
(a) | For Fiscal 2018, Fiscal 2017 and Fiscal 2016, there were 0 shares, 146 shares and 38 shares, respectively, associated with outstanding stock option awards that were not included in the computation of diluted earnings per share above because their effect was antidilutive.
Estimated Useful Lives by Type | September 30, 2018, estimated useful lives by asset type were as follows:
Asset Type |  | Minimum Estimated Useful Life (in years) |  | Maximum Estimated Useful Life (in years)
Buildings and improvements |  | 10 |  | 40
Equipment, primarily cylinders and tanks |  | 5 |  | 30
Electricity generation facilities |  | 25 |  | 40
Pipeline and related assets |  | 25 |  | 40
Transportation equipment and office furniture and fixtures |  | 3 |  | 10
Computer software |  | 1 |  | 10
Property, plant and equipment comprise the following at September 30:
| 2018 |  | 2017
Utilities: |  |  |
Distribution | $ | 3,106.6 |  |  | $ | 2,835.3 |
Transmission | 97.1 |  |  | 96.4 |
Work in process | 130.9 |  |  | 112.6 |
General and other | 281.7 |  |  | 241.0 |
Total Utilities | 3,616.3 |  |  | 3,285.3 |
Non-utility: |  |  |
Land | 191.4 |  |  | 180.1 |
Buildings and improvements | 364.9 |  |  | 351.2 |
Transportation equipment | 257.1 |  |  | 289.3 |
Equipment, primarily cylinders and tanks | 3,375.4 |  |  | 3,529.4 |
Electric generation | 319.5 |  |  | 310.0 |
Pipeline and related assets | 473.0 |  |  | 454.5 |
Work in process | 57.9 |  |  | 95.3 |
Other | 306.6 |  |  | 354.8 |
Total non-utility | 5,345.8 |  |  | 5,564.6 |
Total property, plant and equipment | $ | 8,962.1 |  |  | $ | 8,849.9 |
Average Composite Depreciation Rates | The average composite depreciation rates at our Gas Utility and Electric Utility for Fiscal 2018, 2017 and 2016 were as follows:
| 2018 |  | 2017 |  | 2016
Gas Utility | 2.3 | % |  | 2.2 | % |  | 2.2 | %
Electric Utility | 2.2 | % |  | 2.4 | % |  | 2.5 | %

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