<SEC-DOCUMENT>0001562180-23-007876.txt : 20231122
<SEC-HEADER>0001562180-23-007876.hdr.sgml : 20231122
<ACCEPTANCE-DATETIME>20231122142635
ACCESSION NUMBER:		0001562180-23-007876
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20231120
FILED AS OF DATE:		20231122
DATE AS OF CHANGE:		20231122

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Geiselhart Michael C
		CENTRAL INDEX KEY:			0001374020

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-16681
		FILM NUMBER:		231432847

	MAIL ADDRESS:	
		STREET 1:		700 MARKET STREET
		CITY:			SAINT LOUIS
		STATE:			MO
		ZIP:			63101

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SPIRE INC
		CENTRAL INDEX KEY:			0001126956
		STANDARD INDUSTRIAL CLASSIFICATION:	NATURAL GAS DISTRIBUTION [4924]
		IRS NUMBER:				742976504
		STATE OF INCORPORATION:			MO
		FISCAL YEAR END:			0930

	BUSINESS ADDRESS:	
		STREET 1:		700 MARKET STREET
		CITY:			ST LOUIS
		STATE:			MO
		ZIP:			63101
		BUSINESS PHONE:		3143420500

	MAIL ADDRESS:	
		STREET 1:		700 MARKET STREET
		CITY:			ST LOUIS
		STATE:			MO
		ZIP:			63101

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	LACLEDE GROUP INC
		DATE OF NAME CHANGE:	20001024
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primarydocument.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2023-11-20</periodOfReport>

    <notSubjectToSection16>false</notSubjectToSection16>

    <issuer>
        <issuerCik>0001126956</issuerCik>
        <issuerName>SPIRE INC</issuerName>
        <issuerTradingSymbol>SR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001374020</rptOwnerCik>
            <rptOwnerName>Geiselhart Michael C</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>700 MARKET STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAINT LOUIS</rptOwnerCity>
            <rptOwnerState>MO</rptOwnerState>
            <rptOwnerZipCode>63101</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>Senior Vice President</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>false</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>26252.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Phantom Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2023-11-20</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1850.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>60.96</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1850.00</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>18613.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents phantom stock awarded to the reporting person pursuant to his election to defer into his deferred income plan account 1,850 shares of time-vested restricted stock awarded to him.  The phantom stock vests on November 20, 2026.  Each share of phantom stock is the economic equivalent of one share of Spire Inc. common stock.  Shares of phantom stock are payable in cash to the reporting person in January 2028 and can be transferred to other investments within the reporting person's deferred income plan account at any time at least six months after vesting.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/Courtney Vomund as attorney in fact for Geiselhart Michael C</signatureName>
        <signatureDate>2023-11-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
