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Note 9 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
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Spire Alabama Inc [Member] | Gasoline Derivative Program [Member] |  |
Derivative Assets (Liabilities), at Fair Value, Net, Total | $ 0 | $ 0

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 5 -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480463/815-10-45-5 + Details
Name: | us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=sr_SpireAlabamaIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=sr_GasolineDerivativeProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |