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Acquisitions (Narrative) (Details) (USD $) | 3 Months Ended |  | 0 Months Ended |  | 0 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2014 | Aug. 23, 2014 HDB, Inc. [Member] | Aug. 22, 2014 HDB, Inc. [Member] | Dec. 21, 2013 Kvaerner NAC | Sep. 30, 2014 Kvaerner NAC
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  | Aug. 22, 2014 |  | Dec. 21, 2013 |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  | 100.00% |
Business Acquisition, Name of Acquired Entity |  |  |  | HDB Ltd. Limited Partnership ("HDB"). |  | Kvaerner North American Construction Ltd. and substantially all of the assets of Kvaerner North American Construction Inc |
Business Combination, Consideration Transferred |  |  |  | $ 5,250,000 |  | $ 88,300,000 |
Goodwill | 72,065,000 |  | 69,837,000 |  |  | 39,232,000 |
Tax deductible goodwill |  |  |  |  | 2,586,000 | 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 | 1,000,000
Noncontrolling interest of consolidated joint venture |  |  |  |  |  | 700,000 | 500,000
Revenues | 321,683,000 | 226,217,000 |  |  |  |  |
Operating income | $ 8,547,000 | $ 10,762,000 |  |  |  |  |

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