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    <link:label id="lab_mtrx_LandBuildingsAndImprovementsGross_CF0372769755FC884496EA6B929B3B9A_verboseLabel_en-US" xlink:label="lab_mtrx_LandBuildingsAndImprovementsGross_CF0372769755FC884496EA6B929B3B9A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Land and buildings</link:label>
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    <link:label id="lab_us-gaap_MachineryAndEquipmentGross_899DB1CBBA976923F057EA6B929B4CB6_verboseLabel_en-US" xlink:label="lab_us-gaap_MachineryAndEquipmentGross_899DB1CBBA976923F057EA6B929B4CB6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Construction equipment</link:label>
    <link:label id="lab_us-gaap_MachineryAndEquipmentGross_899DB1CBBA976923F057EA6B929B4CB6_label_en-US" xlink:label="lab_us-gaap_MachineryAndEquipmentGross_899DB1CBBA976923F057EA6B929B4CB6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Machinery and Equipment, Gross</link:label>
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    <link:label id="lab_mtrx_TransportationEquipmentGross_17DAE1F1F6BA21A90583EA6B929B1C74_verboseLabel_en-US" xlink:label="lab_mtrx_TransportationEquipmentGross_17DAE1F1F6BA21A90583EA6B929B1C74" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Transportation equipment</link:label>
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    <link:loc xlink:href="mtrx-20130906.xsd#mtrx_TransportationEquipmentGross" xlink:label="loc_mtrx_TransportationEquipmentGross_17DAE1F1F6BA21A90583EA6B929B1C74" xlink:type="locator" />
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    <link:label id="lab_mtrx_OfficeEquipmentAndCapitalizedComputerSoftwareGross_9AE6231A4AD846718E7AEA6B929CDE68_verboseLabel_en-US" xlink:label="lab_mtrx_OfficeEquipmentAndCapitalizedComputerSoftwareGross_9AE6231A4AD846718E7AEA6B929CDE68" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Office equipment and software</link:label>
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    <link:label id="lab_us-gaap_ConstructionInProgressGross_4E20B3A24DA4B4614028EA6B929CB7E8_terseLabel_en-US" xlink:label="lab_us-gaap_ConstructionInProgressGross_4E20B3A24DA4B4614028EA6B929CB7E8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Construction in progress</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ConstructionInProgressGross" xlink:label="loc_us-gaap_ConstructionInProgressGross_4E20B3A24DA4B4614028EA6B929CB7E8" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_2E06D85DFDC47E7AB57FEA6B929CAC44_totalLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_2E06D85DFDC47E7AB57FEA6B929CAC44" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Property, plant and equipment at cost, gross</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_2E06D85DFDC47E7AB57FEA6B929CAC44_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_2E06D85DFDC47E7AB57FEA6B929CAC44" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Gross</link:label>
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    <link:label id="lab_mtrx_ElectricalInfrastructureMember_4B8A3F372DF0C6900DFEEF3397FB1383_label_en-US" xlink:label="lab_mtrx_ElectricalInfrastructureMember_4B8A3F372DF0C6900DFEEF3397FB1383" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Electrical Infrastructure [Member]</link:label>
    <link:label id="lab_mtrx_ElectricalInfrastructureMember_4B8A3F372DF0C6900DFEEF3397FB1383_documentation_en-US" xlink:label="lab_mtrx_ElectricalInfrastructureMember_4B8A3F372DF0C6900DFEEF3397FB1383" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Electrical infrastructure.</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtrx_ElectricalInfrastructureMember_4B8A3F372DF0C6900DFEEF3397FB1383" xlink:to="lab_mtrx_ElectricalInfrastructureMember_4B8A3F372DF0C6900DFEEF3397FB1383" xlink:type="arc" />
    <link:label id="lab_mtrx_OilGasAndChemicalMember_11846D1782DDA127FB6CEF3397FB8CDB_verboseLabel_en-US" xlink:label="lab_mtrx_OilGasAndChemicalMember_11846D1782DDA127FB6CEF3397FB8CDB" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Oil Gas &amp; Chemical [Member]</link:label>
    <link:label id="lab_mtrx_OilGasAndChemicalMember_11846D1782DDA127FB6CEF3397FB8CDB_label_en-US" xlink:label="lab_mtrx_OilGasAndChemicalMember_11846D1782DDA127FB6CEF3397FB8CDB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Oil Gas And Chemical [Member]</link:label>
    <link:label id="lab_mtrx_OilGasAndChemicalMember_11846D1782DDA127FB6CEF3397FB8CDB_documentation_en-US" xlink:label="lab_mtrx_OilGasAndChemicalMember_11846D1782DDA127FB6CEF3397FB8CDB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Oil gas &amp; chemical.</link:label>
    <link:loc xlink:href="mtrx-20130906.xsd#mtrx_OilGasAndChemicalMember" xlink:label="loc_mtrx_OilGasAndChemicalMember_11846D1782DDA127FB6CEF3397FB8CDB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtrx_OilGasAndChemicalMember_11846D1782DDA127FB6CEF3397FB8CDB" xlink:to="lab_mtrx_OilGasAndChemicalMember_11846D1782DDA127FB6CEF3397FB8CDB" xlink:type="arc" />
    <link:label id="lab_mtrx_StorageSolutionsMember_CA35A219BC756302618BEF3397FBE849_verboseLabel_en-US" xlink:label="lab_mtrx_StorageSolutionsMember_CA35A219BC756302618BEF3397FBE849" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Storage Solutions [Member]</link:label>
    <link:label id="lab_mtrx_StorageSolutionsMember_CA35A219BC756302618BEF3397FBE849_label_en-US" xlink:label="lab_mtrx_StorageSolutionsMember_CA35A219BC756302618BEF3397FBE849" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Storage Solutions [Member]</link:label>
    <link:label id="lab_mtrx_StorageSolutionsMember_CA35A219BC756302618BEF3397FBE849_documentation_en-US" xlink:label="lab_mtrx_StorageSolutionsMember_CA35A219BC756302618BEF3397FBE849" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Storage solutions.</link:label>
    <link:loc xlink:href="mtrx-20130906.xsd#mtrx_StorageSolutionsMember" xlink:label="loc_mtrx_StorageSolutionsMember_CA35A219BC756302618BEF3397FBE849" xlink:type="locator" />
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    <link:label id="lab_mtrx_IndustrialMember_62552E066E3A4845BF3AEF3397FB5C16_verboseLabel_en-US" xlink:label="lab_mtrx_IndustrialMember_62552E066E3A4845BF3AEF3397FB5C16" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Industrial [Member]</link:label>
    <link:label id="lab_mtrx_IndustrialMember_62552E066E3A4845BF3AEF3397FB5C16_label_en-US" xlink:label="lab_mtrx_IndustrialMember_62552E066E3A4845BF3AEF3397FB5C16" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Industrial [Member]</link:label>
    <link:label id="lab_mtrx_IndustrialMember_62552E066E3A4845BF3AEF3397FB5C16_documentation_en-US" xlink:label="lab_mtrx_IndustrialMember_62552E066E3A4845BF3AEF3397FB5C16" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Industrial.</link:label>
    <link:loc xlink:href="mtrx-20130906.xsd#mtrx_IndustrialMember" xlink:label="loc_mtrx_IndustrialMember_62552E066E3A4845BF3AEF3397FB5C16" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GoodwillLineItems_2A912227D01E55B40E66EF3397FBFE3E_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillLineItems_2A912227D01E55B40E66EF3397FBFE3E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goodwill [Line Items]</link:label>
    <link:label id="lab_us-gaap_GoodwillLineItems_2A912227D01E55B40E66EF3397FBFE3E_label_en-US" xlink:label="lab_us-gaap_GoodwillLineItems_2A912227D01E55B40E66EF3397FBFE3E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="loc_us-gaap_GoodwillLineItems_2A912227D01E55B40E66EF3397FBFE3E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GoodwillRollForward_7009982EEE59865621B3EF3397FB6211_verboseLabel_en-US" xlink:label="lab_us-gaap_GoodwillRollForward_7009982EEE59865621B3EF3397FB6211" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Carrying value of goodwill by segment</link:label>
    <link:label id="lab_us-gaap_GoodwillRollForward_7009982EEE59865621B3EF3397FB6211_label_en-US" xlink:label="lab_us-gaap_GoodwillRollForward_7009982EEE59865621B3EF3397FB6211" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillRollForward" xlink:label="loc_us-gaap_GoodwillRollForward_7009982EEE59865621B3EF3397FB6211" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GoodwillGross_36063CBCCF4895F5C63AEF3397FC1E9E_verboseLabel_en-US" xlink:label="lab_us-gaap_GoodwillGross_36063CBCCF4895F5C63AEF3397FC1E9E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Goodwill</link:label>
    <link:label id="lab_us-gaap_GoodwillGross_36063CBCCF4895F5C63AEF3397FC1E9E_label_en-US" xlink:label="lab_us-gaap_GoodwillGross_36063CBCCF4895F5C63AEF3397FC1E9E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill, Gross</link:label>
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    <link:label id="lab_us-gaap_Goodwill_7F92D6E458D45A477F25EF3397FC3008_periodStartLabel_en-US" xlink:label="lab_us-gaap_Goodwill_7F92D6E458D45A477F25EF3397FC3008" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Net Goodwill</link:label>
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    <link:label id="lab_us-gaap_GoodwillPurchaseAccountingAdjustments_417CFF441F4F70307756EF3397FCC6A5_verboseLabel_en-US" xlink:label="lab_us-gaap_GoodwillPurchaseAccountingAdjustments_417CFF441F4F70307756EF3397FCC6A5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Acquisition related adjustment</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_417CFF441F4F70307756EF3397FCC6A5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_Goodwill_F3D3EB1F637586315DB3EF3397FC2184_periodEndLabel_en-US" xlink:label="lab_us-gaap_Goodwill_F3D3EB1F637586315DB3EF3397FC2184" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Net Goodwill</link:label>
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    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_779876D5BF134A8FC616EF3397A5EE53_verboseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_779876D5BF134A8FC616EF3397A5EE53" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Weighted average remaining contractual life exercisable at June 30, 2013</link:label>
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_779876D5BF134A8FC616EF3397A5EE53_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_779876D5BF134A8FC616EF3397A5EE53" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_779876D5BF134A8FC616EF3397A5EE53" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_779876D5BF134A8FC616EF3397A5EE53" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_779876D5BF134A8FC616EF3397A5EE53" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_8E91E9E565E2870318FDEF3397A5E798_periodStartLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_8E91E9E565E2870318FDEF3397A5E798" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Weighted average exercise price at June 30, 2012</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_8E91E9E565E2870318FDEF3397A5E798_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_8E91E9E565E2870318FDEF3397A5E798" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_8E91E9E565E2870318FDEF3397A5E798" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_8E91E9E565E2870318FDEF3397A5E798" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_8E91E9E565E2870318FDEF3397A5E798" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_2CDD3C72B8FBE52CDE52EF3397A5DA6D_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_2CDD3C72B8FBE52CDE52EF3397A5DA6D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Weighted average exercise price granted</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_2CDD3C72B8FBE52CDE52EF3397A5DA6D_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_2CDD3C72B8FBE52CDE52EF3397A5DA6D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_2CDD3C72B8FBE52CDE52EF3397A5DA6D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_2CDD3C72B8FBE52CDE52EF3397A5DA6D" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_2CDD3C72B8FBE52CDE52EF3397A5DA6D" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_182323FE4839C7450F69EF3397A5C4D8_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_182323FE4839C7450F69EF3397A5C4D8" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Weighted average exercise price exercised</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_182323FE4839C7450F69EF3397A5C4D8_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_182323FE4839C7450F69EF3397A5C4D8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_182323FE4839C7450F69EF3397A5C4D8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_182323FE4839C7450F69EF3397A5C4D8" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_182323FE4839C7450F69EF3397A5C4D8" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_4046BC5C84BFB8C5B2A9EF3397A514C3_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_4046BC5C84BFB8C5B2A9EF3397A514C3" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Weighted average exercise price cancelled</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_4046BC5C84BFB8C5B2A9EF3397A514C3_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_4046BC5C84BFB8C5B2A9EF3397A514C3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_4046BC5C84BFB8C5B2A9EF3397A514C3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_4046BC5C84BFB8C5B2A9EF3397A514C3" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_4046BC5C84BFB8C5B2A9EF3397A514C3" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_14DF1564A0BDEFF59075EF3397A51507_periodEndLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_14DF1564A0BDEFF59075EF3397A51507" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Weighted average exercise price at June 30, 2013</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_14DF1564A0BDEFF59075EF3397A51507" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_14DF1564A0BDEFF59075EF3397A51507" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_14DF1564A0BDEFF59075EF3397A51507" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_88BE5DE39D39C24FF58FEF3397A5AEAE_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_88BE5DE39D39C24FF58FEF3397A5AEAE" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Weighted average exercise price vested or expected to vest at June 30, 2013</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_88BE5DE39D39C24FF58FEF3397A5AEAE_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_88BE5DE39D39C24FF58FEF3397A5AEAE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_88BE5DE39D39C24FF58FEF3397A5AEAE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_88BE5DE39D39C24FF58FEF3397A5AEAE" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_88BE5DE39D39C24FF58FEF3397A5AEAE" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_B2BB2B080544D330B565EF3397A56A64_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_B2BB2B080544D330B565EF3397A56A64" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Weighted average exercise price exercisable at June 30, 2013</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_B2BB2B080544D330B565EF3397A56A64_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_B2BB2B080544D330B565EF3397A56A64" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_B2BB2B080544D330B565EF3397A56A64" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_B2BB2B080544D330B565EF3397A56A64" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_B2BB2B080544D330B565EF3397A56A64" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_AD9D989D918324579ACCEF3397A69935_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_AD9D989D918324579ACCEF3397A69935" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Aggregate intrinsic value exercised</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_AD9D989D918324579ACCEF3397A69935_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_AD9D989D918324579ACCEF3397A69935" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_AD9D989D918324579ACCEF3397A69935" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_AD9D989D918324579ACCEF3397A69935" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_AD9D989D918324579ACCEF3397A69935" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_E2E183655C0491911DF4EF3397A6D8F4_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_E2E183655C0491911DF4EF3397A6D8F4" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Aggregate intrinsic value outstanding at June 30, 2013</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_E2E183655C0491911DF4EF3397A6D8F4_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_E2E183655C0491911DF4EF3397A6D8F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_E2E183655C0491911DF4EF3397A6D8F4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_E2E183655C0491911DF4EF3397A6D8F4" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_E2E183655C0491911DF4EF3397A6D8F4" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_7E9C461AE68486BDA261EF3397A628FE_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_7E9C461AE68486BDA261EF3397A628FE" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Aggregate intrinsic value vested or expected to be vest at June 30, 2013</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_7E9C461AE68486BDA261EF3397A628FE_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_7E9C461AE68486BDA261EF3397A628FE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_7E9C461AE68486BDA261EF3397A628FE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_7E9C461AE68486BDA261EF3397A628FE" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_7E9C461AE68486BDA261EF3397A628FE" xlink:type="arc" />
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_2A6BE1CA896857B5803DEF3397A6D479_verboseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_2A6BE1CA896857B5803DEF3397A6D479" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Aggregate intrinsic value exercisable at June 30, 2013</link:label>
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    <link:label id="lab_mtrx_ZoneGreenMember_B6BD89B2CF01CA04C238E949211795A2_documentation_en-US" xlink:label="lab_mtrx_ZoneGreenMember_B6BD89B2CF01CA04C238E949211795A2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Zone green.</link:label>
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    <link:label id="lab_mtrx_EmployeeBenefitPlansTextualAbstract_5E7DC71F35FF82D866F0E94921170C9E_verboseLabel_en-US" xlink:label="lab_mtrx_EmployeeBenefitPlansTextualAbstract_5E7DC71F35FF82D866F0E94921170C9E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Employee Benefit Plans (Textual) [Abstract]</link:label>
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    <link:label id="lab_mtrx_DefinedContributionPlanMaximumAnnualContributionByEmployeePercent_9C4295CE8A4BF78BF10BE949211731EA_verboseLabel_en-US" xlink:label="lab_mtrx_DefinedContributionPlanMaximumAnnualContributionByEmployeePercent_9C4295CE8A4BF78BF10BE949211731EA" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Percentage of limitation on pretax compensation</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_11907021D7EAA883B439E4B286F90524" xlink:type="locator" />
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    <link:label id="lab_us-gaap_TreasuryStockMember_6501C6C5A28B28D73642E4B286F9D505_verboseLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockMember_6501C6C5A28B28D73642E4B286F9D505" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Treasury Stock</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="loc_us-gaap_TreasuryStockMember_6501C6C5A28B28D73642E4B286F9D505" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TreasuryStockMember_6501C6C5A28B28D73642E4B286F9D505" xlink:to="lab_us-gaap_TreasuryStockMember_6501C6C5A28B28D73642E4B286F9D505" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_484D635D1DD795E18A85E4B286F9D7BF_verboseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_484D635D1DD795E18A85E4B286F9D7BF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income(Loss)</link:label>
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_484D635D1DD795E18A85E4B286F9D7BF_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_484D635D1DD795E18A85E4B286F9D7BF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss) [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_484D635D1DD795E18A85E4B286F9D7BF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_484D635D1DD795E18A85E4B286F9D7BF" xlink:to="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_484D635D1DD795E18A85E4B286F9D7BF" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_AC3FA0BBECB6647C8997E4C9C747E058_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_AC3FA0BBECB6647C8997E4C9C747E058" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Stockholders' Equity [Roll Forward]</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_AC3FA0BBECB6647C8997E4C9C747E058_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_AC3FA0BBECB6647C8997E4C9C747E058" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Stockholders' Equity [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_AC3FA0BBECB6647C8997E4C9C747E058" xlink:type="locator" />
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    <link:label id="lab_us-gaap_StockholdersEquity_11F802DE715271952026E4B286F978C4_periodStartLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity_11F802DE715271952026E4B286F978C4" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balances</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_11F802DE715271952026E4B286F978C4" xlink:type="locator" />
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_A9253470401F6775AD86E4B286F9AD05_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_A9253470401F6775AD86E4B286F9AD05" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other comprehensive income (loss)</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_A9253470401F6775AD86E4B286F9AD05_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_A9253470401F6775AD86E4B286F9AD05" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_A9253470401F6775AD86E4B286F9AD05" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_A9253470401F6775AD86E4B286F9AD05" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_A9253470401F6775AD86E4B286F9AD05" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_9716E0A2DF8C7181F79FE4B286F9430E_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_9716E0A2DF8C7181F79FE4B286F9430E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercise of stock options (97,840; 26,500 and 32,000 shares in 2013, 2012 and 2011 respectively)</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_9716E0A2DF8C7181F79FE4B286F9430E_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_9716E0A2DF8C7181F79FE4B286F9430E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Value, Stock Options Exercised</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_9716E0A2DF8C7181F79FE4B286F9430E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_9716E0A2DF8C7181F79FE4B286F9430E" xlink:to="lab_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_9716E0A2DF8C7181F79FE4B286F9430E" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation_4C4E00D69BA8CDA7035AE4B286F96716_verboseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation_4C4E00D69BA8CDA7035AE4B286F96716" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Tax effect of exercised stock options and vesting of deferred shares</link:label>
    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation_4C4E00D69BA8CDA7035AE4B286F96716_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation_4C4E00D69BA8CDA7035AE4B286F96716" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation_4C4E00D69BA8CDA7035AE4B286F96716" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation_4C4E00D69BA8CDA7035AE4B286F96716" xlink:to="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation_4C4E00D69BA8CDA7035AE4B286F96716" xlink:type="arc" />
    <link:label id="lab_mtrx_IssuanceOfDeferredShares_554FC144BF4770510DE4E4B286FA73EA_terseLabel_en-US" xlink:label="lab_mtrx_IssuanceOfDeferredShares_554FC144BF4770510DE4E4B286FA73EA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Issuance of deferred shares (367,449; 184,149 and 126,428 shares in 2013, 2012 and 2011 respectively)</link:label>
    <link:label id="lab_mtrx_IssuanceOfDeferredShares_554FC144BF4770510DE4E4B286FA73EA_label_en-US" xlink:label="lab_mtrx_IssuanceOfDeferredShares_554FC144BF4770510DE4E4B286FA73EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Issuance Of Deferred Shares</link:label>
    <link:label id="lab_mtrx_IssuanceOfDeferredShares_554FC144BF4770510DE4E4B286FA73EA_documentation_en-US" xlink:label="lab_mtrx_IssuanceOfDeferredShares_554FC144BF4770510DE4E4B286FA73EA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Issuance of deferred shares.</link:label>
    <link:loc xlink:href="mtrx-20130906.xsd#mtrx_IssuanceOfDeferredShares" xlink:label="loc_mtrx_IssuanceOfDeferredShares_554FC144BF4770510DE4E4B286FA73EA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mtrx_IssuanceOfDeferredShares_554FC144BF4770510DE4E4B286FA73EA" xlink:to="lab_mtrx_IssuanceOfDeferredShares_554FC144BF4770510DE4E4B286FA73EA" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_811295A310B6529863EBE4B286FA5DC0_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_811295A310B6529863EBE4B286FA5DC0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employee Stock Purchase Plan (4,452; 4,395 and 699 shares in 2013, 2012 and 2011 respectively)</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_811295A310B6529863EBE4B286FA5DC0_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_811295A310B6529863EBE4B286FA5DC0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Issued During Period, Value, Employee Stock Purchase Plan</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_811295A310B6529863EBE4B286FA5DC0" xlink:type="locator" />
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    <link:label id="lab_us-gaap_TreasuryStockValueAcquiredCostMethod_BC9DE9F3395B8C5115F1E4B286FA2A94_negatedLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockValueAcquiredCostMethod_BC9DE9F3395B8C5115F1E4B286FA2A94" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Open market purchase of treasury shares (886,503 shares in 2012)</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_BC9DE9F3395B8C5115F1E4B286FA2A94" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_BC9DE9F3395B8C5115F1E4B286FA2A94" xlink:to="lab_us-gaap_TreasuryStockValueAcquiredCostMethod_BC9DE9F3395B8C5115F1E4B286FA2A94" xlink:type="arc" />
    <link:label id="lab_mtrx_OtherTreasurySharePurchases_3D4AE1746BCB77FEC585E4B286FA7F7F_negatedLabel_en-US" xlink:label="lab_mtrx_OtherTreasurySharePurchases_3D4AE1746BCB77FEC585E4B286FA7F7F" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Other treasury share purchases (107,344; 52,992 and 30,154 shares in 2013, 2012 and 2011 respectively)</link:label>
    <link:label id="lab_mtrx_OtherTreasurySharePurchases_3D4AE1746BCB77FEC585E4B286FA7F7F_label_en-US" xlink:label="lab_mtrx_OtherTreasurySharePurchases_3D4AE1746BCB77FEC585E4B286FA7F7F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Treasury Share Purchases</link:label>
    <link:label id="lab_mtrx_OtherTreasurySharePurchases_3D4AE1746BCB77FEC585E4B286FA7F7F_documentation_en-US" xlink:label="lab_mtrx_OtherTreasurySharePurchases_3D4AE1746BCB77FEC585E4B286FA7F7F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other treasury share purchases.</link:label>
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    <link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_1A8D0C79C620E48AE413E4B286FAA212_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_1A8D0C79C620E48AE413E4B286FAA212" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock-based compensation expense</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_1A8D0C79C620E48AE413E4B286FAA212" xlink:type="locator" />
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    <link:label id="lab_us-gaap_StockholdersEquity_20D3FA8E4145033B8A73E4B286FAC4E9_periodEndLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity_20D3FA8E4145033B8A73E4B286FAC4E9" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balances</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_20D3FA8E4145033B8A73E4B286FAC4E9" xlink:type="locator" />
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