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Intangible Assets Including Goodwill - Carrying Value of Goodwill By Segment (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Jun. 30, 2014
Goodwill [Line Items] |  |  |  |
Goodwill, Purchase Accounting Adjustments | $ 219 us-gaap_GoodwillPurchaseAccountingAdjustments |  |  |
Goodwill, Acquired During Period | 3,054 us-gaap_GoodwillAcquiredDuringPeriod | [1] |  |
Goodwill |  |  | 94,837 us-gaap_GoodwillGross |
Cumulative impairment loss |  |  | (25,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | [2]
Goodwill | 72,212 us-gaap_Goodwill |  |  |
Goodwill [Roll Forward] |  |  |  |
Net balance at June 30, 2014 | 69,837 us-gaap_Goodwill |  |  |
Translation adjustment | (898)us-gaap_GoodwillTranslationAdjustments | [3] |  |
Net balance at December 31, 2014 | 72,212 us-gaap_Goodwill |  |  |
Electrical Infrastructure [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Purchase Accounting Adjustments | 164 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = mtrx_ElectricalInfrastructureMember |  |  |
Goodwill, Acquired During Period | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = mtrx_ElectricalInfrastructureMember | [1] |  |
Goodwill |  |  | 60,896 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = mtrx_ElectricalInfrastructureMember |
Cumulative impairment loss |  |  | (17,653)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = mtrx_ElectricalInfrastructureMember | [2]
Goodwill | 42,886 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mtrx_ElectricalInfrastructureMember |  |  |
Goodwill [Roll Forward] |  |  |  |
Net balance at June 30, 2014 | 43,243 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mtrx_ElectricalInfrastructureMember |  |  |
Translation adjustment | (521)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = mtrx_ElectricalInfrastructureMember | [3] |  |
Net balance at December 31, 2014 | 42,886 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mtrx_ElectricalInfrastructureMember |  |  |
Oil Gas & Chemical [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Acquired During Period | 3,054 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = mtrx_OilGasAndChemicalMember | [1] |  |
Goodwill |  |  | 13,943 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = mtrx_OilGasAndChemicalMember |
Cumulative impairment loss |  |  | (3,000)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = mtrx_OilGasAndChemicalMember | [2]
Goodwill | 13,997 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mtrx_OilGasAndChemicalMember |  |  |
Goodwill [Roll Forward] |  |  |  |
Net balance at June 30, 2014 | 10,943 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mtrx_OilGasAndChemicalMember |  |  |
Translation adjustment | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = mtrx_OilGasAndChemicalMember | [3] |  |
Net balance at December 31, 2014 | 13,997 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mtrx_OilGasAndChemicalMember |  |  |
Storage Solutions [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Acquired During Period | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = mtrx_StorageSolutionsMember | [1] |  |
Goodwill |  |  | 10,949 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = mtrx_StorageSolutionsMember |
Cumulative impairment loss |  |  | (922)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = mtrx_StorageSolutionsMember | [2]
Goodwill | 9,824 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mtrx_StorageSolutionsMember |  |  |
Goodwill [Roll Forward] |  |  |  |
Net balance at June 30, 2014 | 10,027 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mtrx_StorageSolutionsMember |  |  |
Translation adjustment | (203)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = mtrx_StorageSolutionsMember | [3] |  |
Net balance at December 31, 2014 | 9,824 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mtrx_StorageSolutionsMember |  |  |
Industrial [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Purchase Accounting Adjustments | 55 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = mtrx_IndustrialMember |  |  |
Goodwill, Acquired During Period | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = mtrx_IndustrialMember | [1] |  |
Goodwill |  |  | 9,049 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = mtrx_IndustrialMember |
Cumulative impairment loss |  |  | (3,425)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = mtrx_IndustrialMember | [2]
Goodwill | 5,505 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mtrx_IndustrialMember |  |  |
Goodwill [Roll Forward] |  |  |  |
Net balance at June 30, 2014 | 5,624 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mtrx_IndustrialMember |  |  |
Translation adjustment | (174)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = mtrx_IndustrialMember | [3] |  |
Net balance at December 31, 2014 | $ 5,505 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = mtrx_IndustrialMember |  |  |
[1] | . The acquisition is discussed further in Note 2 - Acquisitions.
[2] | A $25.0 million impairment charge was recorded in February 2005 as a result of the Company’s operating performance in fiscal 2005.
[3] | The translation adjustments relate to the periodic translation of Canadian Dollar denominated goodwill recorded as a part of a prior Canadian acquisition as well as the periodic translation of the Canadian entity acquired with the purchase of KNAC

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- 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 -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 + Details
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