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    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_8BB39047D024861A1E4E49E9954DED3A_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_8BB39047D024861A1E4E49E9954DED3A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other long-term obligations</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_8BB39047D024861A1E4E49E9954DED3A_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_8BB39047D024861A1E4E49E9954DED3A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Other Operating Liabilities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_8BB39047D024861A1E4E49E9954DED3A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_38E36DC053FE3BA2AE8D49E9954DF702_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_38E36DC053FE3BA2AE8D49E9954DF702" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_38E36DC053FE3BA2AE8D49E9954DF702" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_38E36DC053FE3BA2AE8D49E9954DF702" xlink:to="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_38E36DC053FE3BA2AE8D49E9954DF702" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_64C1BA4408E6EE7F151849E9954DF76B_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_64C1BA4408E6EE7F151849E9954DF76B" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by operating activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_64C1BA4408E6EE7F151849E9954DF76B_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_64C1BA4408E6EE7F151849E9954DF76B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_64C1BA4408E6EE7F151849E9954DF76B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_64C1BA4408E6EE7F151849E9954DF76B" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_64C1BA4408E6EE7F151849E9954DF76B" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_560B59F9BC645D8F77ED49E9954D8F21_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_560B59F9BC645D8F77ED49E9954D8F21" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">CASH FLOWS FROM INVESTING ACTIVITIES:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_560B59F9BC645D8F77ED49E9954D8F21_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_560B59F9BC645D8F77ED49E9954D8F21" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_560B59F9BC645D8F77ED49E9954D8F21" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_560B59F9BC645D8F77ED49E9954D8F21" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_560B59F9BC645D8F77ED49E9954D8F21" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsToAcquireProductiveAssetsAbstract_9E9232C62A5AD3CF5F3149E9954D9F07_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireProductiveAssetsAbstract_9E9232C62A5AD3CF5F3149E9954D9F07" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Capital expenditures for:</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireProductiveAssetsAbstract_9E9232C62A5AD3CF5F3149E9954D9F07_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireProductiveAssetsAbstract_9E9232C62A5AD3CF5F3149E9954D9F07" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Productive Assets [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireProductiveAssetsAbstract" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssetsAbstract_9E9232C62A5AD3CF5F3149E9954D9F07" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_0277C01B1B4FF2EA8A4949E9954EFA2B_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_0277C01B1B4FF2EA8A4949E9954EFA2B" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Property and equipment</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_0277C01B1B4FF2EA8A4949E9954EFA2B_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_0277C01B1B4FF2EA8A4949E9954EFA2B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Property, Plant, and Equipment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_0277C01B1B4FF2EA8A4949E9954EFA2B" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquireIntangibleAssets_AC12A761A14E84B2683149E9954EDEF9_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireIntangibleAssets_AC12A761A14E84B2683149E9954EDEF9" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Intangible assets</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireIntangibleAssets" xlink:label="loc_us-gaap_PaymentsToAcquireIntangibleAssets_AC12A761A14E84B2683149E9954EDEF9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities_7EA4A4D1798752B1D12649E9954E2E67_terseLabel_en-US" xlink:label="lab_us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities_7EA4A4D1798752B1D12649E9954E2E67" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from sale-leaseback transactions</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_B91EE65883C442382EC849E9954EBD3C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsOfDebtIssuanceCosts_185F7FEE7BEE61726C4749E9954ED035_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtIssuanceCosts_185F7FEE7BEE61726C4749E9954ED035" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term debt issuance costs</link:label>
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    <link:label id="lab_mmsi_PaymentOfTaxesExchangeOfCommonStock_98EC647EBD95102D4EC449E99554A439_negatedLabel_en-US" xlink:label="lab_mmsi_PaymentOfTaxesExchangeOfCommonStock_98EC647EBD95102D4EC449E99554A439" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Payment of taxes related to an exchange of common stock</link:label>
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    <link:label id="lab_mmsi_PaymentOfTaxesExchangeOfCommonStock_98EC647EBD95102D4EC449E99554A439_documentation_en-US" xlink:label="lab_mmsi_PaymentOfTaxesExchangeOfCommonStock_98EC647EBD95102D4EC449E99554A439" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents the total of the cash outflow during the period for taxes related to an exchange of common stock.</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_03072BCF40D78B27672549E99554F836" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_AACD5CFB19D84B05CFD349E99554F1BF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ForwardContractsMember_65C027F6B9665A0CA2192623B34CD9B1_terseLabel_en-US" xlink:label="lab_us-gaap_ForwardContractsMember_65C027F6B9665A0CA2192623B34CD9B1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreign currency forward contracts</link:label>
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