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Note 7 - Notes Payable and Credit Agreements (Details Textual) - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Parent Company [Member] |  |  |
Short Term Borrowings Used to Support Lending to Utilities |  | $ 777,800 |
Spire Missouri [Member] | Unsecured Term Loan [Member] |  |  |
Debt Instrument, Face Amount | $ 250,000 |  |
Debt Instrument, Term (Day) | 364 days |  |
Spire Missouri [Member] | Unsecured Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] (Deprecated 2023) |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.65% |  |
Revolving Credit Facility [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 1,300,000 |
Line of Credit Facility, Covenant, Percentage of Total Capitalization |  | 60.00% |
Long-Term Line of Credit, Total |  | $ 0 | $ 0
Revolving Credit Facility [Member] | Maximum [Member] |  |  |
Line of Credit Facility, Covenant, Percentage of Total Capitalization |  | 70.00% |
Revolving Credit Facility [Member] | Spire [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 450,000 |
Revolving Credit Facility [Member] | Spire Missouri [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 575,000 |
Revolving Credit Facility [Member] | Spire Alabama Inc [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 275,000 |

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- Definition Percentage of total capitalization in the covenant of line of credit facility. + References No definition available. + Details
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- Definition Amount of short-term borrowing used to support lending to utilities. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482900/835-30-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69B Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69C Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482925/835-30-45-2 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482949/835-30-55-8 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 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)(2)) -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(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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