<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2022-10-13</periodOfReport>

    <notSubjectToSection16>false</notSubjectToSection16>

    <issuer>
        <issuerCik>0000723125</issuerCik>
        <issuerName>MICRON TECHNOLOGY INC</issuerName>
        <issuerTradingSymbol>MU</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001689498</rptOwnerCik>
            <rptOwnerName>BHATIA MANISH H</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>8000 S. FEDERAL WAY</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOISE</rptOwnerCity>
            <rptOwnerState>ID</rptOwnerState>
            <rptOwnerZipCode>83716</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>EVP, Global Operations</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2022-10-13</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>78199.00</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>291620.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2022-10-13</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
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                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>336948.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
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                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
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            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
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                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>315539.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
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            </transactionDate>
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                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1200.00</value>
                    <footnoteId id="F2"/>
                </transactionShares>
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                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>316739.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
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                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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            </securityTitle>
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            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
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                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
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                <transactionShares>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
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                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
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                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
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            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>28879.00</value>
                    <footnoteId id="F4"/>
                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
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                    <value>345051.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
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                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2022-10-13</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
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                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
                    <value>52.75</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>330054.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
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                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
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            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
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                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
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                </transactionShares>
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                </transactionPricePerShare>
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                </transactionAcquiredDisposedCode>
            </transactionAmounts>
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                </sharesOwnedFollowingTransaction>
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        <nonDerivativeTransaction>
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            </transactionAmounts>
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            </transactionCoding>
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                </transactionPricePerShare>
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            </transactionAmounts>
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                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
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        </nonDerivativeTransaction>
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                <value>Common Stock</value>
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                </transactionPricePerShare>
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        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
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            <exerciseDate>
                <footnoteId id="F6"/>
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            <expirationDate>
                <footnoteId id="F6"/>
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                <underlyingSecurityTitle>
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                </underlyingSecurityTitle>
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                <equitySwapInvolved>false</equitySwapInvolved>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>19550.00</value>
                    <footnoteId id="F11"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>19550.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Performance Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0.00</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2022-10-13</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>19550.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F12"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F12"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>19550.00</value>
                    <footnoteId id="F12"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>19550.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Restricted Stock Award vests 33 1/3% on October 15, 2023, and 1/12 of the total restricted stock award vests quarterly thereafter.</footnote>
        <footnote id="F10">Each performance-based restricted stock unit represents the right to receive, following vesting, a percentage of one share of common stock based upon the achievement of pre-established performance goals related to relative total shareholder return over a 3-year period beginning September 2, 2022 and ending August 28, 2025 (subject to a 200% aggregate limit on the total target shares that may be received under the performance-based restricted stock units awarded on October 13, 2022), and certification of such performance by the Compensation Committee.</footnote>
        <footnote id="F11">Each performance-based restricted stock unit represents the right to receive, following vesting, a percentage of one share of common stock based upon the achievement of pre-established performance goals related to NAND delivery and solutions over a 3-year period beginning September 2, 2022 and ending August 28, 2025 (subject to a 200% aggregate limit on the total target shares that may be received under the performance-based restricted stock units awarded on October 13, 2022), and certification of such performance by the Compensation Committee.</footnote>
        <footnote id="F12">Each performance-based restricted stock unit represents the right to receive, following vesting, a percentage of one share of common stock based upon the achievement of pre-established performance goals related to DRAM revenue over a 3-year period beginning September 2, 2022 and ending August 28, 2025 (subject to a 200% aggregate limit on the total target shares that may be received under the performance-based restricted stock units awarded on October 13, 2022), and certification of such performance by the Compensation Committee.</footnote>
        <footnote id="F2">The Compensation Committee certified achievement of the pre-established performance goals at a level resulting in a vest of 100% of the total target shares under the performance-based restricted stock units previously awarded on October 16, 2019. As reported at grant, the performance-based restricted stock unit could result in a payout that varies based on actual achievement of the goals, subject to a 200% aggregate limit on the payout of target shares.</footnote>
        <footnote id="F3">Withholding of shares of common stock to satisfy tax withholding obligations in connection with the vesting of previously granted awards.</footnote>
        <footnote id="F4">The Compensation Committee certified achievement of pre-established performance goals related to NAND delivery and solutions at a level resulting in a vest of 100% of the total target shares under the performance-based restricted stock units previously awarded on October 16, 2020. As reported at grant, the performance-based restricted stock unit could result in a payout that varies based on actual achievement of the goals, subject to a 200% aggregate limit on the payout of target shares.</footnote>
        <footnote id="F5">The Compensation Committee certified achievement of pre-established performance goals related to relative total shareholder return at a level resulting in a vest of 46% of the total target shares under the performance-based restricted stock units previously awarded on October 16, 2020. As reported at grant, the performance-based restricted stock unit could result in a payout that varies based on actual achievement of the goals, subject to a 200% aggregate limit on the payout of target shares.</footnote>
        <footnote id="F6">Each performance-based restricted stock unit represents the right to receive, following vesting, a percentage of one share of common stock based upon the achievement of pre-established performance goals related to relative total shareholder return over a 3-year performance period beginning August 30, 2019 and ending September 1, 2022 (subject to a 200% aggregate limit on the total target shares that may be received under the performance-based restricted stock units awarded on October 16, 2019), and certification of such performance by the Compensation Committee.</footnote>
        <footnote id="F7">Each performance-based restricted stock unit represents the right to receive, following vesting, a percentage of one share of common stock based upon the achievement of pre-established performance goals related to NAND delivery and solutions over a 3-year performance period beginning August 30, 2019 and ending September 1, 2022 (subject to a 200% aggregate limit on the total target shares that may be received under the performance-based restricted stock units awarded on October 16, 2019), and certification of such performance by the Compensation Committee.</footnote>
        <footnote id="F8">Each performance-based restricted stock unit represents the right to receive, following vesting, a percentage of one share of common stock based upon the achievement of pre-established performance goals related to NAND delivery and solutions over a 3-year performance period beginning September 4, 2020 and ending August 31, 2023 (subject to a 200% aggregate limit on the total target shares that may be received under the performance-based restricted stock units awarded on October 16, 2020), and certification of such performance by the Compensation Committee.</footnote>
        <footnote id="F9">Each performance-based restricted stock unit represents the right to receive, following vesting, a percentage of one share of common stock based upon the achievement of pre-established performance goals related to relative total shareholder return over a 3-year performance period beginning September 4, 2020 and ending August 31, 2023 (subject to a 200% aggregate limit on the total target shares that may be received under the performance-based restricted stock units awarded on October 16, 2020), and certification of such performance by the Compensation Committee.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Rob Beard, Attorney-in-fact</signatureName>
        <signatureDate>2022-10-17</signatureDate>
    </ownerSignature>
</ownershipDocument>
