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Acquisitions (Pro Forma Information) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Dec. 31, 2013 | Dec. 31, 2013
Kvaerner NAC |  |
Business Acquisition [Line Items] |  |
Revenues | $ 395,600 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember | $ 671,832 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember
Net income attributable to Matrix Service Company | 12,422 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember | 19,834 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember
Basic earnings per common share | $ 0.47 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember | $ 0.76 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember
Diluted earnings per common share | $ 0.46 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember | $ 0.74 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = mtrx_KvaernerNorthAmericanConstructionMember
Adjustment for Amortization Expense [Member] | Matrix NAC |  |
Business Acquisition [Line Items] |  |
Net income attributable to Matrix Service Company | 1,100 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = mtrx_MatrixNACMember / us-gaap_NonrecurringAdjustmentAxis = mtrx_AdjustmentforAmortizationExpenseMember | 2,100 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = mtrx_MatrixNACMember / us-gaap_NonrecurringAdjustmentAxis = mtrx_AdjustmentforAmortizationExpenseMember
Adjustment for Depreciation Expense [Member] | Matrix NAC |  |
Business Acquisition [Line Items] |  |
Net income attributable to Matrix Service Company | $ 600 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = mtrx_MatrixNACMember / us-gaap_NonrecurringAdjustmentAxis = mtrx_AdjustmentforDepreciationExpenseMember | $ 1,200 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = mtrx_MatrixNACMember / us-gaap_NonrecurringAdjustmentAxis = mtrx_AdjustmentforDepreciationExpenseMember

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