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Note 17 - Leases - Year-end Balance Sheet and Weighted-average Information About Operating Lease (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Weighted-average remaining lease term (in years) (Year) | 14 years 1 month 6 days | 15 years
Weighted-average discount rate | 4.20% | 4.10%
Spire Missouri [Member] |  |
Weighted-average remaining lease term (in years) (Year) | 5 years 7 months 6 days | 5 years 1 month 6 days
Weighted-average discount rate | 3.30% | 2.20%
Spire Alabama Inc [Member] |  |
Weighted-average remaining lease term (in years) (Year) | 13 years 3 months 18 days | 14 years 3 months 18 days
Weighted-average discount rate | 3.70% | 3.70%
Deferred Charges and Other Assets, Other [Member] |  |
Right-of-use assets | $ 70.6 | $ 73.7
Deferred Charges and Other Assets, Other [Member] | Spire Missouri [Member] |  |
Right-of-use assets | 2.1 | 1.7
Deferred Charges and Other Assets, Other [Member] | Spire Alabama Inc [Member] |  |
Right-of-use assets | 19.2 | 20.2
Other Current Liabilities [Member] |  |
Lease liabilities, current | 6.8 | 6.5
Other Current Liabilities [Member] | Spire Missouri [Member] |  |
Lease liabilities, current | 0.5 | 0.4
Other Current Liabilities [Member] | Spire Alabama Inc [Member] |  |
Lease liabilities, current | 1.9 | 1.9
Deferred Credits and Other Liabilities, Other [Member] |  |
Lease liabilities, noncurrent | 70.2 | 73.7
Deferred Credits and Other Liabilities, Other [Member] | Spire Missouri [Member] |  |
Lease liabilities, noncurrent | 1.8 | 1.5
Deferred Credits and Other Liabilities, Other [Member] | Spire Alabama Inc [Member] |  |
Lease liabilities, noncurrent | $ 23.5 | $ 24.6

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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