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Commitments and Contingencies Accounts Receivable under Litigation (Details) $ in Millions | Mar. 31, 2020 USD ($)
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Receivables Subject to Litigation [Abstract] |
Contracts Receivable, Claims and Uncertain Amounts | $ 16.5

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- Definition Receivables Subject to Litigation [Abstract] + References No definition available. + Details
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Namespace Prefix: | mtrx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of billed or unbilled claims or other similar items subject to uncertainty concerning their determination or ultimate realization under long-term contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(c)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant