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v3.23.1

Note 7 - Notes Payable and Credit Agreements - Short-term Borrowings (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021
Term Loan [Member] | Spire Missouri [Member] |  |
Highest borrowings outstanding | $ 456.6 |
Lowest borrowings outstanding | 43.2 |
Weighted average borrowings | $ 244.9 |
Weighted average interest rate | 0.40% |
Borrowings outstanding | $ 445.3 | $ 240.9
Weighted average interest rate | 3.30% |
Spire Note [Member] | Spire Missouri [Member] |  |
Highest borrowings outstanding | $ 265.2 |
Lowest borrowings outstanding | 38.4 |
Weighted average borrowings | $ 152.6 |
Weighted average interest rate | 0.50% |
Borrowings outstanding | $ 260.9 | $ 49.0
Weighted average interest rate | 3.30% | 0.20%
Spire Note [Member] | Spire Alabama Inc [Member] |  |
Highest borrowings outstanding | $ 1,079.0 |
Lowest borrowings outstanding | 462.5 |
Weighted average borrowings | $ 749.2 |
Weighted average interest rate | 1.10% |
Borrowings outstanding | $ 1,037.5 | $ 672.0
Weighted average interest rate | 3.30% | 0.40%
Parent Company [Member] | Term Loan [Member] |  |
Highest borrowings outstanding | $ 250.0 |
Lowest borrowings outstanding | 0.0 |
Weighted average borrowings | $ 113.0 |
Weighted average interest rate | 0.80% |
Borrowings outstanding | $ 0.0 | $ 250.0
Weighted average interest rate |  | 0.70%
Parent Company [Member] | Commercial Paper [Member] |  |
Highest borrowings outstanding | 1,079.0 |
Lowest borrowings outstanding | 408.0 |
Weighted average borrowings | $ 636.2 |
Weighted average interest rate | 1.20% |
Borrowings outstanding | $ 1,037.5 | $ 422.0
Weighted average interest rate | 3.30% | 0.20%

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- Definition Minimum amount borrowed under the credit facility at any time during the period. + References No definition available. + Details
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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481372/852-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph (a) -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph (b) -Subparagraph (1) -Publisher SEC + Details
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