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    <link:label id="lab_us-gaap_LongtermDebtTypeAxis_C1FAAF428BBBDB1B34969AD3C2205A05_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis_C1FAAF428BBBDB1B34969AD3C2205A05" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Axis]</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentAxis_F8A5B084A6D0605F10509AD3C221C7AA_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis_F8A5B084A6D0605F10509AD3C221C7AA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument [Axis]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentAxis_F8A5B084A6D0605F10509AD3C221C7AA_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis_F8A5B084A6D0605F10509AD3C221C7AA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Axis]</link:label>
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    <link:label id="lab_us-gaap_DebtInstrumentNameDomain_E29E3124CDA9CD106BC39AD3C221F090_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain_E29E3124CDA9CD106BC39AD3C221F090" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Name [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_E29E3124CDA9CD106BC39AD3C221F090" xlink:type="locator" />
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    <link:label id="lab_plxs_A4.05SeniorNotesMember_D7C2B3783026F33416279AD3C222320B_terseLabel_en-US" xlink:label="lab_plxs_A4.05SeniorNotesMember_D7C2B3783026F33416279AD3C222320B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4.05% Senior Notes, due June 15, 2025</link:label>
    <link:label id="lab_plxs_A4.05SeniorNotesMember_D7C2B3783026F33416279AD3C222320B_label_en-US" xlink:label="lab_plxs_A4.05SeniorNotesMember_D7C2B3783026F33416279AD3C222320B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">4.05% Senior Notes [Member]</link:label>
    <link:label id="lab_plxs_A4.05SeniorNotesMember_D7C2B3783026F33416279AD3C222320B_documentation_en-US" xlink:label="lab_plxs_A4.05SeniorNotesMember_D7C2B3783026F33416279AD3C222320B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">4.05% Senior Notes [Member]</link:label>
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    <link:label id="lab_plxs_A4.22SeniorNotesMember_9F20FE5E7723FF973BE99AD3C222FE1F_terseLabel_en-US" xlink:label="lab_plxs_A4.22SeniorNotesMember_9F20FE5E7723FF973BE99AD3C222FE1F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">4.22% Senior Notes, due June 15, 2028</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_24896EAA0DA4262F41559AD3C223A399" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityAverageOutstandingAmount" xlink:label="loc_us-gaap_LineOfCreditFacilityAverageOutstandingAmount_569E86A9371C4E3ADCAD9AD3C228BA3B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_D42B3BA824BB9348961B9AD3C2286E62_verboseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_D42B3BA824BB9348961B9AD3C2286E62" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Amount borrowed</link:label>
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    <link:label id="lab_us-gaap_RepaymentsOfLinesOfCredit_05D73B507DCDB47B20F29AD3C22937B9_terseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfLinesOfCredit_05D73B507DCDB47B20F29AD3C22937B9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amount repaid</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_FE760B820B5A6DBE6DEC9AD3C22929BB" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LongTermDebtFairValue_9E041A475320AD8C63D69ADBC1176878_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtFairValue_9E041A475320AD8C63D69ADBC1176878" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt, Fair Value</link:label>
    <link:label id="lab_us-gaap_LongTermDebtFairValue_9E041A475320AD8C63D69ADBC1176878_label_en-US" xlink:label="lab_us-gaap_LongTermDebtFairValue_9E041A475320AD8C63D69ADBC1176878" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Fair Value</link:label>
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    <link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_0035D1C0D579586234C1A567C011A838_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_0035D1C0D579586234C1A567C011A838" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Cash Flows [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_0035D1C0D579586234C1A567C011A838" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_81321C11D003867FC4F1A567C011B182_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_81321C11D003867FC4F1A567C011B182" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from operating activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_81321C11D003867FC4F1A567C011B182_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_81321C11D003867FC4F1A567C011B182" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
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    <link:label id="lab_us-gaap_NetIncomeLoss_81BBBE4D6E1C554F0449A567C011EF98_verboseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_81BBBE4D6E1C554F0449A567C011EF98" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Net income (loss)</link:label>
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    <link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_2335CC6149E50F60DB5CA567C0127019_terseLabel_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_2335CC6149E50F60DB5CA567C0127019" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation and amortization</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_70E7F1A80118B5D51475A567C01316F0" xlink:type="locator" />
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    <link:label id="lab_plxs_IncreaseDecreaseinContractwithCustomerAsset_A6967773556B1676FA5DA567C013D631_negatedTerseLabel_en-US" xlink:label="lab_plxs_IncreaseDecreaseinContractwithCustomerAsset_A6967773556B1676FA5DA567C013D631" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Contract assets</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_00E22CF19357E227CE4EA567C0143428" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedTaxesPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedTaxesPayable_9EEF64EF5E15559F61D8A567C014499A" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_4EF8EBE33FB6BC88C07AA567C014A1A3" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInCustomerDeposits" xlink:label="loc_us-gaap_IncreaseDecreaseInCustomerDeposits_E3528DFAF6A6F4CB2153A567C014C0E7" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_D6272502B417D69D9AFAA567C0140C22" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_8C084D32164A837F441BA567C01420FE" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GrossProfit_4B9F0E17EE6EB57843059FE520E3A7A6_totalLabel_en-US" xlink:label="lab_us-gaap_GrossProfit_4B9F0E17EE6EB57843059FE520E3A7A6" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Gross profit</link:label>
    <link:label id="lab_us-gaap_GrossProfit_4B9F0E17EE6EB57843059FE520E3A7A6_label_en-US" xlink:label="lab_us-gaap_GrossProfit_4B9F0E17EE6EB57843059FE520E3A7A6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gross Profit</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_4B9F0E17EE6EB57843059FE520E3A7A6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpense_4809EFC7C451C9E7B0419FE520E3051B_label_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpense_4809EFC7C451C9E7B0419FE520E3051B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Selling, General and Administrative Expense</link:label>
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    <link:label id="lab_us-gaap_OperatingIncomeLoss_04793E3CF797080285019FE520E3881D_label_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_04793E3CF797080285019FE520E3881D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Income (Loss)</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingIncomeLoss_04793E3CF797080285019FE520E3881D" xlink:to="lab_us-gaap_OperatingIncomeLoss_04793E3CF797080285019FE520E3881D" xlink:type="arc" />
    <link:label id="lab_us-gaap_NonoperatingIncomeExpenseAbstract_1CF1021AF5FD63CB1B9C9FE520E38DB3_terseLabel_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpenseAbstract_1CF1021AF5FD63CB1B9C9FE520E38DB3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other income (expense):</link:label>
    <link:label id="lab_us-gaap_NonoperatingIncomeExpenseAbstract_1CF1021AF5FD63CB1B9C9FE520E38DB3_label_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpenseAbstract_1CF1021AF5FD63CB1B9C9FE520E38DB3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nonoperating Income (Expense) [Abstract]</link:label>
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    <link:label id="lab_us-gaap_InterestExpense_02F982E107CC4658ABCA9FE520E359A5_label_en-US" xlink:label="lab_us-gaap_InterestExpense_02F982E107CC4658ABCA9FE520E359A5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_02F982E107CC4658ABCA9FE520E359A5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_InvestmentIncomeInterest_6C8D85A7023A1AE0609C9FE520E3C193_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentIncomeInterest_6C8D85A7023A1AE0609C9FE520E3C193" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest income</link:label>
    <link:label id="lab_us-gaap_InvestmentIncomeInterest_6C8D85A7023A1AE0609C9FE520E3C193_label_en-US" xlink:label="lab_us-gaap_InvestmentIncomeInterest_6C8D85A7023A1AE0609C9FE520E3C193" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment Income, Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="loc_us-gaap_InvestmentIncomeInterest_6C8D85A7023A1AE0609C9FE520E3C193" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_5A804EA181978A8C00989FE520E3A058_totalLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_5A804EA181978A8C00989FE520E3A058" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Income before income taxes</link:label>
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    <link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_2044E896B4F850DCF29B9FE520E3E539_label_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit_2044E896B4F850DCF29B9FE520E3E539" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Expense (Benefit)</link:label>
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    <link:label id="lab_us-gaap_EarningsPerShareAbstract_9869D5E184371ACDB0A09FE520E361D8_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareAbstract_9869D5E184371ACDB0A09FE520E361D8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Earnings (loss) per share:</link:label>
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