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Intangible Assets Including Goodwill - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2015		Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment charge	$ 25,000,000us-gaap_GoodwillImpairmentLoss	[1]
Amortization expense			3,700,000us-gaap_AmortizationOfIntangibleAssets	1,700,000us-gaap_AmortizationOfIntangibleAssets
2014	1,245,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear		1,245,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
2015	3,242,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo		3,242,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2016	2,901,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree		2,901,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2017	2,534,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour		2,534,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Finite-Lived Intangible Assets, Amortization Expense, Year Five	2,534,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive		2,534,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	9,374,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive		9,374,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets, Fair Value Disclosure	900,000us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember		900,000us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
SM Electric Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Trade Names	$ 1,400,000us-gaap_FiniteLivedTradeNamesGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mtrx_SMElectricTradeNameMember		$ 1,400,000us-gaap_FiniteLivedTradeNamesGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = mtrx_SMElectricTradeNameMember
Minimum [Member] | Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			6 years		6 years
Minimum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			1 year 6 months		1 year 6 months
Minimum [Member] | Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			3 years		3 years
Maximum [Member] | Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			15 years		15 years
Maximum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			15 years		15 years
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			10 years
Maximum [Member] | Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			5 years		5 years
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			3 years		5 years
[1] A $25.0 million impairment charge was recorded in February 2005 as a result of the Company’s operating performance in fiscal 2005.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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