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Acquisitions (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Aug. 22, 2014	Aug. 22, 2014	Dec. 21, 2013	Jun. 30, 2014
Business Acquisition [Line Items]
Goodwill	$ 71,377,000us-gaap_Goodwill		$ 71,377,000us-gaap_Goodwill					$ 69,837,000us-gaap_Goodwill
Revenues	314,155,000us-gaap_SalesRevenueServicesNet	381,516,000us-gaap_SalesRevenueServicesNet	978,718,000us-gaap_SalesRevenueServicesNet	918,731,000us-gaap_SalesRevenueServicesNet
Operating income	(14,448,000)us-gaap_OperatingIncomeLoss	18,819,000us-gaap_OperatingIncomeLoss	(9,572,000)us-gaap_OperatingIncomeLoss	44,398,000us-gaap_OperatingIncomeLoss
HDB, Inc. [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition						Aug. 22, 2014
Business Acquisition, Name of Acquired Entity					HDB Ltd. Limited Partnership ("HDB").
Business Combination, Consideration Transferred					5,551,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mtrx_HDBInc.Member
Tax deductible goodwill					3,054,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = mtrx_HDBInc.Member	3,054,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = mtrx_HDBInc.Member
Kvaerner NAC
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition							Dec. 21, 2013
Business Acquisition, Percentage of Voting Interests Acquired							100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember
Business Acquisition, Name of Acquired Entity							Kvaerner North American Construction Ltd. and substantially all of the assets of Kvaerner North American Construction Inc
Business Combination, Consideration Transferred							88,300,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember
Goodwill							39,295,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember
Tax deductible goodwill							28,500,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember
Noncontrolling Interest, Description			The Joint Venture was formed by Kvaerner North American Construction Inc. and an engineering firm to engineer and construct a combined cycle power plant in Dover, Delaware.
Noncontrolling Interest, Ownership Percentage by Parent	65.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember		65.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember
mtrx_JointVentureValue							2,000,000mtrx_Mtrx_JointVentureValue / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember
mtrx_ControllingInterestOfJointVenture,Value							1,300,000mtrx_Mtrx_ControllingInterestOfJointVentureValue / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember
Noncontrolling interest of consolidated joint venture							700,000us-gaap_MinorityInterestInJointVentures / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember
SM Electric Trade Name [Member]
Business Acquisition [Line Items]
Finite-Lived Trade Names, Gross	$ 1,400,000us-gaap_FiniteLivedTradeNamesGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mtrx_SMElectricTradeNameMember		$ 1,400,000us-gaap_FiniteLivedTradeNamesGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mtrx_SMElectricTradeNameMember

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