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Uncompleted Contracts - Gross and Net Amounts of Uncompleted Contracts (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Jun. 30, 2014
Disclosure Customer Contracts Additional Information [Abstract]
Costs incurred and estimated earnings recognized on uncompleted contracts	$ 1,689,803mtrx_UncompletedContractsCostsIncurredAndEstimatedEarningsRecognized	$ 1,435,242mtrx_UncompletedContractsCostsIncurredAndEstimatedEarningsRecognized
Billings on uncompleted contracts	1,751,909mtrx_UncompletedContractsBillings	1,470,674mtrx_UncompletedContractsBillings
Total	(62,106)mtrx_UncompletedContractsNet	(35,432)mtrx_UncompletedContractsNet
Shown on balance sheet as:
Costs and estimated earnings in excess of billings on uncompleted contracts	77,340us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	73,008us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
Billings on uncompleted contracts in excess of costs and estimated earnings	139,446us-gaap_BillingsInExcessOfCost	108,440us-gaap_BillingsInExcessOfCost
Total	$ (62,106)us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms	$ (35,432)us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms

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Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section 45

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Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings.

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