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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 SL8+EnT0ueonBat9pCtdu2dNJT5Fi+iNDsOHt+g5080Ji2QgRxrScUjSCY71APUf
 jBUxPf3BZoDv7vtbUMq6QQ==

<SEC-DOCUMENT>0001104659-03-010597.txt : 20030519
<SEC-HEADER>0001104659-03-010597.hdr.sgml : 20030519
<ACCEPTANCE-DATETIME>20030519093048
ACCESSION NUMBER:		0001104659-03-010597
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030515
FILED AS OF DATE:		20030519

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			DEYOUNG MARK W
		CENTRAL INDEX KEY:			0001188447

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-10582
		FILM NUMBER:		03709708

	BUSINESS ADDRESS:	
		STREET 1:		900 EHLEN DRIVE
		CITY:			ANOKA
		STATE:			MN
		ZIP:			55303
		BUSINESS PHONE:		7633233870

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ALLIANT TECHSYSTEMS INC
		CENTRAL INDEX KEY:			0000866121
		STANDARD INDUSTRIAL CLASSIFICATION:	ORDNANCE & ACCESSORIES, (NO VEHICLES/GUIDED MISSILES) [3480]
		IRS NUMBER:				411672694
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0331

	BUSINESS ADDRESS:	
		STREET 1:		5050 LINCOLN DRIVE
		CITY:			EDINA
		STATE:			MN
		ZIP:			55436-1097
		BUSINESS PHONE:		9523513000

	MAIL ADDRESS:	
		STREET 1:		5050 LINCOLN DRIVE
		CITY:			EDINA
		STATE:			MN
		ZIP:			55436-1097
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>j1312_4.xml
<DESCRIPTION>4
<TEXT>
<XML>
<?xml version="1.0" encoding="utf-8" standalone="no"?>
<ownershipDocument>
    <schemaVersion>X0101</schemaVersion>

    <documentType>4</documentType>
  <periodOfReport>2003-05-15</periodOfReport>
  <notSubjectToSection16>0</notSubjectToSection16>
    <issuer>
        <issuerCik>0000866121</issuerCik>
        <issuerName>ALLIANT TECHSYSTEMS INC</issuerName>
        <issuerTradingSymbol>ATK</issuerTradingSymbol>
  </issuer>
  <reportingOwner>
    <reportingOwnerId>
            <rptOwnerCik>0001188447</rptOwnerCik>
            <rptOwnerName>DEYOUNG MARK W</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
      <isDirector>0</isDirector>
      <isOfficer>1</isOfficer>
      <isTenPercentOwner>0</isTenPercentOwner>
      <isOther>0</isOther>
      <officerTitle>GVP Ammunition</officerTitle>
    </reportingOwnerRelationship>
  </reportingOwner>
  <nonDerivativeSecurity>
    <securityTitle>
      <value>Common Stock</value>
    </securityTitle>
    <transactionDate>
      <value>2003-05-15</value>
    </transactionDate>
    <transactionCoding>
      <transactionFormType>4</transactionFormType>
      <transactionCode>F</transactionCode>
      <equitySwapInvolved>0</equitySwapInvolved>
      <footnoteId id="F1"/>
    </transactionCoding>
    <transactionTimeliness>
      <value/>
    </transactionTimeliness>
    <transactionAmounts>
      <transactionShares>
        <value>24</value>
      </transactionShares>
      <transactionValue>
        <value>52.985</value>
      </transactionValue>
      <transactionAcquiredDisposedCode>
        <value>D</value>
      </transactionAcquiredDisposedCode>
    </transactionAmounts>
    <postTransactionAmounts>
      <sharesOwnedFollowingTransaction>
        <value>3043</value>
        <footnoteId id="F2"/>
      </sharesOwnedFollowingTransaction>
    </postTransactionAmounts>
    <ownershipNature>
      <directOrIndirectOwnership>
        <value>D</value>
      </directOrIndirectOwnership>
    </ownershipNature>
  </nonDerivativeSecurity>
  <footnotes>
    <footnote id="F1">Shares withheld to pay taxes applicable to the vesting of restricted stock.</footnote>
    <footnote id="F2">The amount reported includes: 68 shares subject to certain restrictions (including possible forfeiture) applicable to restricted stock grants under the Issuer's 2000 Stock Incentive Plan; 419.396 directly-owned shares held in the Issuer's Employee Stock Purchase Plan as of March 31, 2003; and 983.778 indirectly-owned shares allocated to the reporting person's account under the Issuer's 401(k) plan as of April 30, 2003.</footnote>
  </footnotes>
  <ownerSignature>
    <signatureName>Mark W. DeYoung</signatureName>
    <signatureDate>2003-05-16</signatureDate>
  </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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