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Acquisitions (Narrative) (Details) (USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 21, 2013 | Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 | Mar. 31, 2013 | Jun. 30, 2013 | Dec. 21, 2013 Kvaerner NAC | Mar. 31, 2014 Kvaerner NAC | Mar. 31, 2014 Matrix NAC | Mar. 31, 2014 Matrix NAC | Dec. 31, 2012 Pelichem
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  |  |  | Dec. 21, 2013 |  |  |  | Dec. 31, 2012
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  | 100.00% |  |  |  |
Business Acquisition, Name of Acquired Entity | Kvaerner North American Construction Ltd. and substantially all of the assets of Kvaerner North American Construction Inc |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  | $ 88,100,000 |  |  |  |
Goodwill |  | 66,589,000 |  | 66,589,000 |  | 30,836,000 | 36,176,000 |  |  |  | 2,247,000
Tax deductible goodwill |  |  |  |  |  |  | 28,500,000 |  |  |  |
Noncontrolling Interest, Description |  |  |  |  |  |  |  | The Joint Venture was formed by Kvaerner North American Construction Inc. and an engineering firm to engineer and construct a combined cycle power plant in Dover, Delaware. |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  | 65.00% |  |  |
mtrx_JointVentureValue |  |  |  |  |  |  |  | 2,000,000 |  |  |
mtrx_ControllingInterestOfJointVenture,Value |  |  |  |  |  |  |  | 1,300,000 |  |  |
Noncontrolling interest of consolidated joint venture |  |  |  |  |  |  | 700,000 | 1,100,000 |  |  |
Revenues |  | 381,516,000 | 225,970,000 | 918,731,000 | 657,014,000 |  |  |  | 64,000,000 | 69,400,000 |
Operating income |  | 18,819,000 | 8,431,000 | 44,398,000 | 25,127,000 |  |  |  | 400,000 | 400,000 |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  |  | $ 2,000,000 |

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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