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Debt - Availability Under The Senior Credit Facility (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Debt Disclosure [Abstract]    
Senior credit facility $ 200,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity $ 200,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Capacity Constraint Due To Senior Leverage Ratio 67,528mtrx_CapacityConstraintDueToSeniorLeverageRatio 0mtrx_CapacityConstraintDueToSeniorLeverageRatio
Line Of Credit Facility Maximum Borrowing Capacity After Consideration Of Capacity Constraint 132,472mtrx_LineOfCreditFacilityMaximumBorrowingCapacityAfterConsiderationOfCapacityConstraint 200,000mtrx_LineOfCreditFacilityMaximumBorrowingCapacityAfterConsiderationOfCapacityConstraint
Line of Credit Facility, Amount Outstanding 9,934us-gaap_LineOfCredit 11,621us-gaap_LineOfCredit
Letters of credit subject to the credit facility 32,654mtrx_LettersOfCreditSubjectToCreditFacility 23,017mtrx_LettersOfCreditSubjectToCreditFacility
Availability under the senior credit facility $ 89,884us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity $ 165,362us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity