XML 44 R32.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Intangible Assets Including Goodwill - Carrying Value of Goodwill By Segment (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 12, 2016
Goodwill [Line Items] |  |
Goodwill | $ 113,501 |
Goodwill [Roll Forward] |  |
Net balance at June 30, 2015 | 113,501 |
Translation adjustment | 114 |
Net balance at March 31, 2018 | 113,615 |
Electrical Infrastructure [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 42,152 |
Goodwill [Roll Forward] |  |
Net balance at June 30, 2015 | 42,152 |
Translation adjustment | 30 |
Net balance at March 31, 2018 | 42,182 |
Oil Gas & Chemical [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 33,604 |
Goodwill [Roll Forward] |  |
Net balance at June 30, 2015 | 33,604 |
Translation adjustment | 0 |
Net balance at March 31, 2018 | 33,604 |
Storage Solutions [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 16,764 |
Goodwill [Roll Forward] |  |
Net balance at June 30, 2015 | 16,764 |
Translation adjustment | 78 |
Net balance at March 31, 2018 | 16,842 |
Industrial [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 20,981 |
Goodwill [Roll Forward] |  |
Net balance at June 30, 2015 | 20,981 |
Translation adjustment | 6 |
Net balance at March 31, 2018 | $ 20,987 |
Houston Interests, LLC [Member] |  |
Goodwill [Line Items] |  |
Goodwill |  | $ 35,146

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillForeignCurrencyTranslationGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_GoodwillRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mtrx_ElectricalInfrastructureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mtrx_OilGasAndChemicalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mtrx_StorageSolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mtrx_IndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=mtrx_HoustonInterestsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |