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INTERIM FINANCIAL INFORMATION (UNAUDITED) (Tables) | 12 Months Ended
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Sep. 30, 2017
Quarterly Financial Information [Line Items] |
Schedule of Quarterly Financial Information |
Three Months Ended | Dec. 31 |  | March 31 |  | June 30 |  | Sept. 30
Fiscal Year 2017 |  |  |  |  |  |  |
Total Operating Revenues | $ | 495.1 |  |  | $ | 663.4 |  |  | $ | 323.5 |  |  | $ | 258.7 |
Operating Income | 89.1 |  |  | 180.4 |  |  | 50.3 |  |  | 1.9 |
Net Income (Loss) | 45.2 |  |  | 108.0 |  |  | 21.7 |  |  | (13.3 | )
Basic Earnings (Loss) Per Share of Common Stock | $ | 0.99 |  |  | $ | 2.36 |  |  | $ | 0.45 |  |  | $ | (0.28 | )
Diluted Earnings (Loss) Per Share of Common Stock | $ | 0.99 |  |  | $ | 2.36 |  |  | $ | 0.45 |  |  | $ | (0.28 | )
Fiscal Year 2016 |  |  |  |  |  |  |
Total Operating Revenues | $ | 399.4 |  |  | $ | 609.3 |  |  | $ | 249.3 |  |  | $ | 279.3 |
Operating Income (Loss) | 87.0 |  |  | 167.7 |  |  | 35.3 |  |  | (7.7 | )
Net Income (Loss) | 46.9 |  |  | 100.8 |  |  | 10.7 |  |  | (14.2 | )
Basic Earnings (Loss) Per Share of Common Stock | $ | 1.08 |  |  | $ | 2.32 |  |  | $ | 0.24 |  |  | $ | (0.31 | )
Diluted Earnings (Loss) Per Share of Common Stock | $ | 1.08 |  |  | $ | 2.31 |  |  | $ | 0.24 |  |  | $ | (0.31 | )
Spire Missouri |
Quarterly Financial Information [Line Items] |
Schedule of Quarterly Financial Information |
Three Months Ended | Dec. 31 |  | March 31 |  | June 30 |  | Sept. 30
Fiscal Year 2017 |  |  |  |  |  |  |
Total Operating Revenues | $ | 363.6 |  |  | $ | 447.2 |  |  | $ | 198.5 |  |  | $ | 162.6 |
Operating Income | 64.5 |  |  | 90.2 |  |  | 30.5 |  |  | 11.7 |
Net Income | 38.0 |  |  | 57.0 |  |  | 15.5 |  |  | 2.5 |
Fiscal Year 2016 |  |  |  |  |  |  |
Total Operating Revenues | $ | 317.2 |  |  | $ | 446.7 |  |  | $ | 179.3 |  |  | $ | 144.3 |
Operating Income | 65.1 |  |  | 87.0 |  |  | 29.4 |  |  | 5.4 |
Net Income (Loss) | 39.4 |  |  | 54.3 |  |  | 13.9 |  |  | (1.7 | )
Spire Alabama |
Quarterly Financial Information [Line Items] |
Schedule of Quarterly Financial Information |
Three Months Ended | Dec. 31 |  | March 31 |  | June 30 |  | Sept. 30
Fiscal Year 2017 |  |  |  |  |  |  |
Total Operating Revenues | $ | 86.7 |  |  | $ | 158.8 |  |  | $ | 90.5 |  |  | $ | 64.5 |
Operating Income (Loss) | 19.8 |  |  | 78.9 |  |  | 15.5 |  |  | (8.4 | )
Net Income (Loss) | 10.3 |  |  | 47.6 |  |  | 7.4 |  |  | (7.2 | )
Fiscal Year 2016 |  |  |  |  |  |  |
Total Operating Revenues | $ | 82.3 |  |  | $ | 166.0 |  |  | $ | 74.0 |  |  | $ | 46.2 |
Operating Income (Loss) | 18.9 |  |  | 80.4 |  |  | 9.3 |  |  | (17.1 | )
Net Income (Loss) | 9.9 |  |  | 48.1 |  |  | 4.0 |  |  | (8.8 | )

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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