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LONG-TERM DEBT (Tables) | 12 Months Ended
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Sep. 30, 2017
Debt Disclosure [Abstract] |
Schedule of maturities of long-term debt by fiscal year | Maturities of long-term debt for Spire on a consolidated basis, Spire Missouri and Spire Alabama for the five fiscal years subsequent to September 30, 2017 are as follows:
| Spire |  | Spire Missouri |  | Spire Alabama
2018 | $ | 100.0 |  |  | $ | 100.0 |  |  | $ | — |
2019 | 180.0 |  |  | 50.0 |  |  | — |
2020 | 40.0 |  |  | — |  |  | 40.0 |
2021 | 55.0 |  |  | — |  |  | — |
2022 | 50.0 |  |  | — |  |  | 50.0 |

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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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