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Note 6 - Long-term Debt (Details Textual) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 07, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Oct. 13, 2022
Long-Term Debt, Gross |  | $ 3,258.9 | $ 3,014.6 |  |
Interest Paid, Capitalized, Investing Activities |  | 4.5 | 4.4 | $ 5.8 |
Subsidiaries [Member] |  |  |  |  |
Long-Term Debt, Gross |  | 205.9 |  |  |
Spire Missouri [Member] |  |  |  |  |
Long-Term Debt, Gross |  | 1,648.0 | 1,348.0 |  |
Interest Paid, Capitalized, Investing Activities |  | 0.6 | 0.2 | 0.8 |
Regulatory Preferred Stock and Debt Securities Issuance Amount Authorized |  | 800.0 |  |  |
Spire Missouri [Member] | First Mortgage Bonds Due December Two Two Thousand Twenty Four [Member] |  |  |  |  |
Long-Term Debt, Gross | $ 300.0 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.00% |  |  |  |
Spire Missouri [Member] | First Mortgage Bonds Due December Two Two Thousand Twenty Four [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.50% |  |  |  |
Spire Missouri [Member] | Floating Rate Series Due December 2, 2024 [Member] |  |  |  |  |
Long-Term Debt, Gross |  | 300.0 |  |  |
Spire Alabama Inc [Member] |  |  |  |  |
Long-Term Debt, Gross |  | 575.0 | 625.0 |  |
Interest Paid, Capitalized, Investing Activities |  | $ 3.2 | $ 3.2 | $ 1.9 |
Spire Alabama Inc [Member] | Notes Due October 15, 2029 [Member] | Subsequent Event [Member] |  |  |  |  |
Long-Term Debt, Gross |  |  |  |  | $ 90.0
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 5.32%
Spire Alabama Inc [Member] | Notes Due October 15, 2032 [Member] | Subsequent Event [Member] |  |  |  |  |
Long-Term Debt, Gross |  |  |  |  | $ 85.0
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 5.41%
Spire Gulf [Member] | First Mortgage Bonds Due October 15, 2037 [Member] | Subsequent Event [Member] |  |  |  |  |
Long-Term Debt, Gross |  |  |  |  | $ 30.0
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 5.61%

X
- Definition Amount authorized by State regulatory for the issuance of debt securities, preferred stock, capital leases, and to issue common stock and receive paid-in capital which remains available to issue at period end. + References No definition available. + Details
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