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Uncompleted Contracts - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Mar. 31, 2015	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2014
Customer Contracts [Line Items]
Contract Receivable Retainage, Due in Next Twelve Months	$ 32.1us-gaap_ContractReceivableRetainageDueOneYearOrLess	$ 32.1us-gaap_ContractReceivableRetainageDueOneYearOrLess		$ 30.0us-gaap_ContractReceivableRetainageDueOneYearOrLess
Contract Receivable Retainage, Due after Next Twelve Months	2.7us-gaap_ContractReceivableRetainageDueAfterOneYear	2.7us-gaap_ContractReceivableRetainageDueAfterOneYear		4.3us-gaap_ContractReceivableRetainageDueAfterOneYear
Change In Accounting Estimate, Financial Effect, Operating Income	$ 28.5mtrx_ChangeInAccountingEstimateFinancialEffectOperatingIncome	$ 54.7mtrx_ChangeInAccountingEstimateFinancialEffectOperatingIncome	$ 5.4mtrx_ChangeInAccountingEstimateFinancialEffectOperatingIncome
Change in Accounting Estimate, Financial Effect, Net Income	9.7	18.7

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Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract to be collected after the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3(c)(4))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph c(4)

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 910

-SubTopic 310

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6471494&loc=d3e49370-109356

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- Definition

Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract to be collected in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph c

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 910

-SubTopic 310

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6471494&loc=d3e49370-109356

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