Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Contractors [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Major Customers [Axis] Customer [Axis] Name of Major Customer [Domain] Customer [Domain] S.M. Electric Company [Member] S.M. Electric Company [Member] S.M. Electric Company [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] SME [Member] SME [Member] SME. Business Acquisition [Line Items] Business Acquisition [Line Items] Contract Receivable Retainage, Next Twelve Months Contract Receivable Retainage, Next Twelve Months Contract Receivable Retainage, after Next Twelve Months Contract Receivable Retainage, after Next Twelve Months Retention Payable Retention Payable Change In Accounting Estimate, Financial Effect, Operating Income Change In Accounting Estimate, Financial Effect, Operating Income Change In Accounting Estimate, Financial Effect, Operating Income Change in Accounting Estimate, Financial Effect, Net Income Change in Accounting Estimate, Financial Effect, Net Income Change in Accounting Estimate, Financial Effect, Net Income Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Gross [Member] Operating Segments [Member] Intersegment Eliminations [Member] Intersegment Eliminations [Member] Business Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Electrical Infrastructure [Member] Electrical Infrastructure [Member] Electrical infrastructure. Oil Gas & Chemical [Member] Oil Gas And Chemical [Member] Oil gas & chemical. Storage Solutions [Member] Storage Solutions [Member] Storage solutions. Industrial [Member] Industrial [Member] Industrial. Unallocated Corporate [Member] Other Segments [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Results of Operations Segment Reporting Information, Profit (Loss) [Abstract] Gross revenues Gross revenues Gross revenues before intersegment eliminations Less: Inter-segment revenues Revenues Revenues Gross profit Gross Profit Operating income (loss) Operating Income (Loss) Segment assets Assets Capital expenditures Payments to Acquire Property, Plant, and Equipment Depreciation and amortization Depreciation, Depletion and Amortization Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Statement of Cash Flows [Abstract] Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions : Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Deferred income taxes Deferred Income Tax Expense Benefit Socf Deferred income tax expense benefit socf. (Gain) loss on sale of property, plant and equipment Gain (Loss) on Disposition of Property Plant Equipment Provision for uncollectible accounts Provision for Doubtful Accounts Stock-based compensation expense Share-based Compensation Excess tax benefit of exercised stock options and vesting of deferred shares Excess Tax Benefit from Share-based Compensation, Operating Activities Other Other Noncash Income (Expense) Impairment of Intangible Assets, Finite-lived Impairment of Intangible Assets, Finite-lived Changes in operating assets and liabilities increasing (decreasing) cash, net of effects from acquisitions: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Costs and estimated earnings in excess of billings on uncompleted contracts Increase Decrease In Costs And Estimated Earnings In Excess Of Billings On Uncompleted Contracts Increase Decrease In Costs And Estimated Earnings In Excess Of Billings On Uncompleted Contracts Inventories Increase (Decrease) in Inventories Other assets and liabilities Increase (Decrease) in Other Operating Assets Accounts payable Increase (Decrease) in Accounts Payable Billings on uncompleted contracts in excess of costs and estimated earnings Increase (Decrease) in Billing in Excess of Cost of Earnings Accrued expenses Increase (Decrease) in Accrued Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Acquisitions, net of cash acquired (Note 2) Payments to Acquire Businesses, Net of Cash Acquired Acquisition of property, plant and equipment Proceeds from asset sales Proceeds from Sale of Productive Assets Net cash used by investing activities Net Cash Provided by (Used in) Investing Activities Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Advances under senior revolving credit facility Proceeds from Long-term Lines of Credit Repayments of advances under senior revolving credit facility Repayments of Long-term Lines of Credit Payment of debt amendment fees Payments of Debt Issuance Costs Open market purchase of treasury shares Payments for Repurchase of Common Stock Issuances of common stock Proceeds from Stock Options Exercised Proceeds from issuance of common stock under employee stock purchase plan Proceeds from Stock Plans Repurchase of common stock for payment of statutory taxes due on equity-based compensation Payments for Repurchase of Other Equity Capital contributions from noncontrolling interest Proceeds from Noncontrolling Interests Repayment of acquired long-term debt Repayments of Long-term Debt Excess tax benefit of exercised stock options and vesting of deferred shares Excess Tax Benefit from Share-based Compensation, Financing Activities Capital lease payments Repayments of Long-term Capital Lease Obligations Net cash provided (used) by financing activities Net Cash Provided by (Used in) Financing Activities Effect of exchange rate changes on cash Effect of Exchange Rate on Cash and Cash Equivalents Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, end of period Other cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid during the period for income taxes Income Taxes Paid, Net Cash paid during the period for interest Interest Paid Non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Accrued working capital adjustment Accrued working capital adjustment Accrued working capital adjustment owed to the previous owners of Houston Interests, LLC. Purchases of property, plant and equipment on account Capital Expenditures Incurred but Not yet Paid Assumption of debt from acquisition Acquiredlongtermdebt Acquired long-term debt, which represents a non-cash financing activity. Accounting Policies [Abstract] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Geographical [Axis] Geographical [Axis] Segment, Geographical [Domain] Geographical [Domain] International [Member] International [Member] International. Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Building [Member] Building [Member] Construction Equipment [Member] Equipment [Member] Transportation Equipment [Member] Transportation Equipment [Member] Office Equipment and Software [Member] Furniture and Fixtures [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Useful life of intangible assets Finite-Lived Intangible Asset, Useful Life Depreciable life of office equipment and software Property, Plant and Equipment, Useful Life Restricted cash Restricted Cash and Cash Equivalents Cash Cash Summary Of Significant Accounting Policies (Textual) [Abstract] Summary of significant accounting policies. Compensation and Retirement Disclosure [Abstract] Schedule of Multiemployer Plans [Table] Schedule of Multiemployer Plans [Table] Multiemployer Plan Type [Axis] Multiemployer Plan Type [Axis] Multiemployer Plans Type [Domain] Multiemployer Plans Type [Domain] Plumbers and Pipefitters Local Union Seven Four Pension Fund [Member] Plumbers and Pipefitters Local Union Seven Four Pension Fund [Member] Plumbers and Pipefitters Local Union Seven Four Pension Fund [Member] Multiemployer Plan Zone By Type [Axis] Multiemployer Plan Zone By Type [Axis] Multiemployer plan zone by type. Multiemployer Plan Zone By Type [Domain] Multiemployer Plan Zone By Type [Domain] Multiemployer plan zone by type. Zone Red [Member] Zone Red [Member] Zone red. Zone Yellow [Member] Zone Yellow [Member] Zone yellow. Zone Green [Member] Zone Green [Member] Zone green. Multiemployer Plans [Line Items] Multiemployer Plans [Line Items] Percentage of plan funded Percentage of Plan Funded Percentage of plan funded. Description of plans funded Description of Funded Portion of Plan Description of funded portion of plan. Employee Benefit Plans (Textual) [Abstract] Employee Benefit Plans (Textual) [Abstract] Employee benefit plans. Percentage of limitation on pretax compensation Defined Contribution Plan Maximum Annual Contribution by Employee Percent Maximum percentage of employee gross pay, by the terms of the plan, that the employee may contribute to a defined contribution plan. Company match of first 3% of employee contributions Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Percentage of employee contribution for first half Percentage Of Employee Contribution As Base For Employer Contributions Percentage of employee contribution as base for employer contributions. Employee contribution for next 2% Defined Contribution Plan Employer Matching Contribution Percent For Two percent of Employee Contribution Defined contribution plan employer matching contribution percent for next two percent of employee contribution. Percentage of employee contribution for next half Percentage of Employee Contribution As Base for Employer Contribution to Match Percentage of employee contribution as base for employer contribution to match Contribution made by company Defined Contribution Plan, Cost Recognized Employee share purchase limit aggregate market value Employee Stock Purchase Plan Maximum Annual Share Purchase Limited To Aggregate Market Value Employee stock purchase plan per participant maximum annual share purchase limited to aggregate market value. Shares available at ESPP Employee Stock Purchase Plan Maximum Number Of Shares Available For Issuance Employee stock purchase plan maximum number of shares available for issuance. Employee Stock Purchase Plan, Termination Date Employee Stock Purchase Plan, Termination Date Employee Stock Purchase Plan, Termination Date Shares issued under ESPP Stock Issued During Period, Shares, Employee Stock Purchase Plans Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Exercise Price Range [Axis] Exercise Price Range [Axis] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Range Three [Member] Range Three [Member] Range Three [Member] Range One [Member] Range One [Member] Range one. Range Two [Member] Range Two [Member] Range two. Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Stock options information Schedule of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range [Abstract] Schedule of share based compensation shares authorized under stock option plans by exercise price range. Range of exercise price lower limit Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Range of exercise price upper limit Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Stock options outstanding, option outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Stock options outstanding weighted average exercise price Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price Stock options outstanding weighted average remaining contractual life Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Stock options exercisable option outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Stock options exercisable weighted average exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Stock options exercisable weighted average remaining contractual life Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-In Capital Additional Paid-in Capital [Member] Retained Earnings Retained Earnings [Member] Treasury Stock Treasury Stock [Member] Accumulated Other Comprehensive Income(Loss) AOCI Attributable to Parent [Member] Noncontrolling Interest Noncontrolling Interest [Member] Statement [Line Items] Statement [Line Items] Cumulative Effect of New Accounting Principle in Period of Adoption Cumulative Effect of New Accounting Principle in Period of Adoption Beginning equity balances, as adjusted Beginning equity balances, as adjusted Beginning equity balances as adjusted for the effects of retrospective impacts of the adoption of a new accounting standard. Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balances, beginning Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Capital contributions from Non-controlling Interest Noncontrolling Interest, Increase from Subsidiary Equity Issuance Net income (loss) Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Treasury Shares Sold to Employee Stock Purchase Plan Stock Issued During Period, Value, Employee Stock Purchase Plan Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Issuance of deferred shares Issuance Of Deferred Shares Issuance of deferred shares. Treasury shares repurchased to satisfy tax withholding obligations Other Treasury Share Purchases Other treasury share purchases. Tax effect of exercised stock options and vesting of deferred shares Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Open market purchase of treasury shares Treasury Stock, Value, Acquired, Cost Method Stock-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Consolidated joint venture included in acquisition (Note 2) Payments to Acquire Interest in Joint Venture Balances, ending Net Income (Loss) Attributable to Parent Net Income (Loss) Attributable to Parent Net Income (Loss) Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Noncontrolling Interest Statement of Financial Position [Abstract] Accounts receivable, allowances Allowance for Doubtful Accounts Receivable, Current Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Shares, Outstanding Treasury stock, shares Treasury Stock, Shares Debt Disclosure [Abstract] Availability under the senior credit facility Schedule of Line of Credit Facilities [Table Text Block] Amortization expense Amortization of Intangible Assets June 30, 2015 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months June 30, 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Two June 30, 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Three June 30, 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Four June 30, 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Net carrying amount Finite-Lived Intangible Assets, Net Business Combinations [Abstract] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] MXPB Power Partners [Member] MXPB Power Partners [Member] MXPB Power Partners [Member] Houston Interests, LLC [Member] Houston Interests, LLC [Member] Houston Interests, LLC [Member] Baillie Tank Equipment, Ltd. [Member] Baillie Tank Equipment, Ltd. [Member] Baillie Tank Equipment, Ltd. [Member] HDB, Inc. [Member] HDB, Inc. [Member] HDB, Inc. [Member] Kvaerner North American Construction [Member] Kvaerner North American Construction [Member] Kvaerner North American Construction [Member] Net purchase price Business Combination, Consideration Transferred Business Acquisition, Effective Date of Acquisition Business Acquisition, Effective Date of Acquisition Stock acquired, percent Business Acquisition, Percentage of Voting Interests Acquired Net assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Economic purchase price Economicpurchaseprice Purchase price paid at closing including debt assumed, settlement of other liabilities, less cash acquired and customary working capital closing adjustments. Goodwill Goodwill Tax deductible goodwill Business Acquisition, Goodwill, Expected Tax Deductible Amount Ownership interest in joint venture, percent Equity Method Investment, Ownership Percentage Equity of joint venture acquired mtrx_JointVentureValue mtrx_JointVentureValue Company's portion of joint venture equity acquired mtrx_ControllingInterestOfJointVenture,Value mtrx_MatrixShareOfJointVenture,Value Noncontrolling interest in joint venture Noncontrolling Interest in Joint Ventures Warranty reserve working capital provision Warranty reserve working capital provision Amount the Company could have to pay the previous owners, as a working capital adjustment, depending on the amount of unused acquired warranty reserve remaining as of June 30, 2017. Settlement of warranty reserve Settlement of warranty reserve Settlement of warranty reserve with previous owners of Houston Interests, LLC. Acquisition-related expenses Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed Revenue of Acquiree since Acquisition Date, Actual Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Earnings of Acquiree since Acquisition Date, Actual Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Incremental intangible amortization expense Business Acquisition, Pro Forma Amortization of Intangible Assets Business Acquisition, Pro Forma Amortization of Intangible Assets Depreciation expenses Business Acquisition, Pro Forma Depreciation Expense Business Acquisition, Pro Forma Depreciation Expense Income from one-time tax settlement Business Acquisition, Pro Forma Income from Tax Settlement Business Acquisition, Pro Forma Income from Tax Settlement Valuation and Qualifying Accounts [Abstract] Valuation and Qualifying Accounts Disclosure [Table] Valuation and Qualifying Accounts Disclosure [Table] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Valuation Allowances and Reserves [Domain] Allowance for Doubtful Accounts [Member] Allowance for Doubtful Accounts [Member] Valuation Allowance of Deferred Tax Assets [Member] Valuation Allowance of Deferred Tax Assets [Member] Valuation and Qualifying Accounts Disclosure [Line Items] Valuation and Qualifying Accounts Disclosure [Line Items] Movement in Valuation Allowances and Reserves [Roll Forward] Movement in Valuation Allowances and Reserves [Roll Forward] Balance at Beginning of Period Valuation Allowances and Reserves, Balance Charged to Costs and Expenses Valuation Allowances and Reserves, Additions for Charges to Cost and Expense Charged to Other Accounts Valuation Allowances and Reserves, Additions for Charges to Other Accounts Deductions Valuation Allowances and Reserves, Deductions Balance at End of Period Leases [Abstract] Future minimum operating lease payable, in total Operating Leases, Future Minimum Payments Due Minimum operating lease payable, Fiscal 2018 Operating Leases, Future Minimum Payments Due, Next Twelve Months Minimum operating lease payable, Fiscal 2019 Operating Leases, Future Minimum Payments, Due in Two Years Minimum operating lease payable, Fiscal 2020 Operating Leases, Future Minimum Payments, Due in Three Years Minimum operating lease payable, Fiscal 2021 Operating Leases, Future Minimum Payments, Due in Four Years Minimum operating lease payable, Fiscal 2022 Operating Leases, Future Minimum Payments, Due in Five Years Minimum operating lease payable, Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Operating lease expense Operating Leases, Rent Expense Acquisitions Business Combination Disclosure [Text Block] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] UNITED STATES UNITED STATES CANADA CANADA Other international [Member] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Summary of revenues and long lived assets according to geographic areas Schedule Of Segment Reporting Information By Geographic Areas [Abstract] Schedule of segment reporting information by geographic areas. Revenues Sales Revenue, Services, Net Long-Lived Assets Long-Lived Assets Accounting Changes and Error Corrections [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Deferred Tax Asset Impact [Member] Deferred Tax Asset Impact [Member] Impact of adopting ASU 2015-17 to Deferred Tax Assets Deferred Tax Liabilities Impact [Member] Deferred Taxes Impact Liabilities [Member] Impact to Deferred Tax Liabilities from adopting ASU 2015-17. Adjustments for Change in Accounting Principle [Axis] Adjustments for Change in Accounting Principle [Axis] Adjustments for Change in Accounting Principle [Domain] Adjustments for Change in Accounting Principle [Domain] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification Effect of new accounting standard compared to old standard Effect of new accounting standard compared to old standard Effect of new accounting standard compared to old standard Effect of adoption of new accounting standard compared to old standard, EPS Effect of adoption of new accounting standard compared to old standard, EPS Effect of adoption of new accounting standard compared to old standard, EPS New Accounting Pronouncement or Change in Accounting Principle, Description of Prior-period Information Retrospectively Adjusted New Accounting Pronouncement or Change in Accounting Principle, Description of Prior-period Information Retrospectively Adjusted Other Additional Capital Other Additional Capital Pelichem Industrial Cleaning Services, LLC [Member] Pelichem Industrial Cleaning Services, LLC [Member] Pelichem Industrial Cleaning Services, LLC [Member] Cash paid for equity interest Cash paid for equity interest Cash paid for the equity interests of an acquiree. Acquisition Related Adjustment for Final Working Capital Settlement Acquisition Related Adjustment for Final Working Capital Settlement Acquisition related adjustment for the final working capital settlement. Cash consideration paid Cash consideration paid Cash consideration paid for acquisition, not including accrued working capital payment. Accounts receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Costs and estimated earnings in excess of billings on uncompleted contracts Costs and estimated earnings in excess of billings on uncompleted contracts Costs and estimated earnings in excess of billings on uncompleted contracts assumed in business combination. Other current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets Current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Property, plant and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Other intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Total assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Accounts payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable Billings on uncompleted contracts in excess of costs and estimated earnings Billings on uncompleted contracts in excess of costs and estimated earnings Billings on uncompleted contracts in excess of costs and estimated earnings assumed in business combination. Other accrued expenses Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other Current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Deferred income taxes Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent Long-term debt Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Other liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Noncontrolling interest of consolidated joint venture Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Net assets acquired Cash acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Pro Forma Information: Business Acquisition, Pro Forma Information [Abstract] Revenues Business Acquisition, Pro Forma Revenue Net income attributable to Matrix Service Company Business Acquisition, Pro Forma Net Income (Loss) Basic earnings per common share (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Basic Diluted earnings per common share (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Pro forma acquisition costs Pro forma acquisition costs One time acquisition and integration costs that would not have been incurred without the consummation of a business combination. Pro forma acquisition costs, amortized over time Pro forma acquisition costs, amortized over time Pro forma acquisition costs, amortized over time Pro forma interest expense Pro forma interest expense Pro forma interest expense Pro forma depreciation and amortization expense Pro forma depreciation and amortization expense Pro forma depreciation and amortization expense Pro forma income tax expense Pro forma income tax expense Pro forma income tax expense Stockholders' Equity Note [Abstract] Class of Treasury Stock [Table] Class of Treasury Stock [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Stock Repurchase Program Expiration Date Stock Repurchase Program Expiration Date Preferred stock shares authorized Preferred Stock, Shares Authorized Preferred stock shares issued Preferred Stock, Shares Issued Preferred stock shares outstanding Preferred Stock, Shares Outstanding Annual maximum purchases authorized under stock buyback program Stock Repurchase Program, Authorized Amount Cash Dividend and Stock Repurchase Restriction Cash Dividend and Stock Repurchase Restriction Cash dividends and stock repurchases are restricted to $5.0 million during pursuant to the credit amendment subsequent event, and these transactions are only allowed if the Leverage Ratio is lesser than or equal to 2.50 to 1.00. Leverage Ratio Required to Repurchase Common Stock or Pay Cash Dividends, Maximum Leverage Ratio Required to Repurchase Common Stock or Pay Cash Dividends, Maximum Leverage ratio required to repurchase common stock or pay cash dividends; maximum. Leverage Ratio Required to Repurchase Common Stock or Pay Cash Dividends, Minimum Leverage Ratio Required to Repurchase Common Stock or Pay Cash Dividends, Minimum Leverage ratio required to repurchase common stock or pay cash dividends, minimum Purchase of common stock on stock buyback program Stock Repurchase Program, Number of Shares Authorized to be Repurchased Payments for Repurchase of Common Stock Stock Repurchased During Period, Shares Stock Repurchased During Period, Shares Common stock shares withheld Shares Paid for Tax Withholding for Share Based Compensation Assumptions used to calculate grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Expected life in years Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Customer Contracts Long-term Contracts or Programs Disclosure [Text Block] Stock option activity and related information Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Number of options outstanding at June 30, 2016 Number of options granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Number of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Number of options cancelled Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Number of options outstanding at June 30, 2017 Number of options vested or expected to vest at June 30, 2017 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Number of options exercisable at June 30, 2017 Weighted average remaining contractual life Weighted average remaining contractual life vested or expected to vest at June 30, 2017 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Weighted average remaining contractual life exercisable at June 30, 2017 Weighted average exercise price at June 30, 2016 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted average exercise price granted Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Weighted average exercise price exercised Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted average exercise price cancelled Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Weighted average exercise price at June 30, 2017 Weighted average exercise price vested or expected to vest at June 30, 2017 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Weighted average exercise price exercisable at June 30, 2017 Aggregate intrinsic value outstanding at June 30, 2016 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Aggregate intrinsic value exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Aggregate intrinsic value outstanding at June 30, 2017 Aggregate intrinsic value vested or expected to be vest at June 30, 2017 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Aggregate intrinsic value exercisable at June 30, 2017 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Matrix Service Company's 2004 Stock and Incentive Compensation Plan [Member] Matrix Service Company's 2004 Stock and Incentive Compensation Plan [Member] Matrix Service Company's 2004 Stock and Incentive Compensation Plan (2004 Plan) [Member] Matrix Service Company's 2012 Stock and Incentive Compensation Plan [Member] Matrix Service Company's 2012 Stock and Incentive Compensation Plan [Member] Matrix Service Company's 2012 Stock and Incentive Compensation Plan (2012) [Member] Matrix Service Company 2016 Stock and Incentive Compensation Plan [Member] Matrix Service Company 2016 Stock and Incentive Compensation Plan [Member] Matrix Service Company 2016 Stock and Incentive Compensation Plan [Member] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Market Based Awards [Member] Market Based Awards [Member] Market based awards. Vest in 2016 [Member] Vest in 2016 [Member] Vest in 2016 [Member] Vest in 2017 [Member] Vest in 2017 [Member] Vest in 2017 [Member] Vest in 2018 [Member] Vest in 2018 [Member] Vest in 2018 [Member] Vest in 2019 [Member] Vest in 2019 [Member] Vest in 2019 [Member] Vest in 2020 [Member] Vest in 2020 [Member] Vest in 2020 [Member] Type of Deferred Compensation [Axis] Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Type of Deferred Compensation, All Types [Domain] Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Domain] Employee Award [Member] Employee Award [Member] Employee Award. Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Unrecognized stock-based compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted average period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Stock based compensation expense recognized tax Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Share awards authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Share awards grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Common stock grant expiration term Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Total intrinsic value of stock option Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Vesting period, equal annual installments Share Based Compensation Arrangement By Share Based Payment Award Installment Period For Vesting Share based compensation arrangement by share based payment award installment period for vesting. Vesting period of director awards Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period of Director Awards Share based compensation arrangement by share based payment award award vesting period of director awards. Description of vesting period of director awards Share Based Compensation Arrangement By Share Based Payment Award Award Description of Vesting Period of Director Awards Share based compensation arrangement by share based payment award award description of vesting period of director award. Pro-rate of original awards, minimum Payout As Percentage Of Original Award Minimum Payout as percentage of original award minimum. Pro-rate of original awards maximum Payout As Percentage Of Original Award Maximum Payout as percentage of original award maximum. Minimum threshold shares scheduled to vest for performance based shares Minimum Threshold Shares Scheduled To Vest For Performance Based Shares Minimum threshold shares scheduled to vest for performance based shares. Deferred shares granted Share Based Compensation Arrangement By Share Based Payment Award Deferred Grants In Period Share based compensation arrangement by share based payment award deferred grants in period. Average grant date fair value Share Based Compensation Arrangement By Share Based Payment Award Deferred Weighted Average Grant Date Fair Value Share based compensation arrangement by share based payment award deferred weighted average grant date fair value. Deferred shares vested and released Share Based Compensation Arrangement By Share Based Payment Award Deferred Shares Vested And Released Share based compensation arrangement by share based payment award deferred shares vested and released. Weighted average fair value Share Based Compensation Arrangement By Share Based Payment Award Deferred Shares Vested And Released Weighted Average Grant Date Fair Value Share based compensation arrangement by share based payment award deferred shares vested and released weighted average grant date fair value. Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used Share Based Compensation Arrangement By Share Based Payment Award Fair Value Method Number of Simulations Used Share Based Compensation Arrangement By Share Based Payment Award Fair Value Method Number of Simulations Used Share Based Compensation Arrangement By Share Based Payment Award Fair Value Method Number of Simulations Used Income Tax Disclosure [Abstract] Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest Income (Loss) from Continuing Operations, Net of Tax, Attributable to Noncontrolling Interest Unremitted earnings Undistributed Earnings of Foreign Subsidiaries Liability for Uncertain Tax Positions, Noncurrent Liability for Uncertainty in Income Taxes, Noncurrent Commitments and Contingencies Disclosure [Abstract] Claims related to unapproved change orders Accounts Receivable, Unapproved Contract Claims Segment Information Segment Reporting Disclosure [Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Reporting Unit at Risk [Member] Reporting Unit [Member] Reporting unit at risk for impairment Goodwill [Line Items] Goodwill [Line Items] Carrying value of goodwill by segment Goodwill [Roll Forward] Goodwill Goodwill, Gross Cumulative impairment loss Goodwill, Impaired, Accumulated Impairment Loss Net Goodwill Acquisition Related Adjustment for Final Working Capital Settlement Goodwill resulting from purchase Goodwill, Acquired During Period Translation adjustment Goodwill, Foreign Currency Translation Gain (Loss) Net Goodwill Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount Gross and net amount of uncompleted contracts Gross And Net Amount Of Uncompleted Contracts Table [Text Block] Gross and net amount of uncompleted contracts. Significant components of Company's deferred tax assets and liabilities Components of Deferred Tax Assets and Liabilities [Abstract] Deferred tax assets: Components of Deferred Tax Assets [Abstract] Warranty reserve Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves Bad debt reserve Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts Paid time-off accrual Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Compensated Absences Insurance reserve Deferred Tax Assets Insurance Reserve Deferred tax assets insurance reserve. Legal reserve Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Legal Settlements Net operating loss benefit and credit carryforwards Deferred Tax Assets, Tax Credit Carryforwards Valuation allowance Deferred Tax Assets, Valuation Allowance Accrued compensation and pension Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions Stock compensation expense on nonvested deferred shares Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Accrued losses Deferred Tax Assets Accrued Losses Deferred tax assets accrued losses. Foreign currency translation and other Deferred Tax Assets, Other Total deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities: Components of Deferred Tax Liabilities [Abstract] Tax over book depreciation Deferred Tax Liabilities, Property, Plant and Equipment Tax over book amortization Deferred Tax Liabilities, Goodwill Branch future liability FutureBranchLiability Future domestic income tax liability related to foreign branch deferred tax assets. Prepaid insurance Deferred Tax Liabilities, Prepaid Expenses Receivable holdbacks and other Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred tax asset Deferred Tax Assets, Net Operating Leases Leases of Lessee Disclosure [Text Block] Stock option activity and related information Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Nonvested deferred share activity Schedule of Nonvested Share Activity [Table Text Block] Deferred Tax Assets, Gross, Current Deferred Tax Assets, Gross, Current Deferred Tax Liabilities, Gross, Current Deferred Tax Liabilities, Gross, Current Significant components of Company's deferred tax assets and liabilities as reported in consolidated balance sheets Deferred Tax Assets, Net, Classification [Abstract] Deferred income tax assets Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Deferred income tax liabilities Deferred Tax Liabilities, Net, Noncurrent Net deferred tax liability Deferred Tax Liabilities, Net Difference between expected income tax provision applying domestic federal statutory tax rate and reported income tax provision Effective Income Tax Rate Reconciliation, Amount [Abstract] Expected provision for Federal income taxes at the statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State income taxes, net of Federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Deemed foreign dividends Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount Charges without tax benefit Income Tax Reconciliation Charges Without Tax Benefit Income Tax Reconciliation, Charges without tax benefit Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Excess tax benefits on stock-based compensation Cumulative non-deductible expenses Income Tax Reconciliation Cumulative Non Deductible Expenses Income Tax Reconciliation, Cumulative non deductible expenses IRS S199 deduction Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount Foreign tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount Research and development and other tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Foreign tax differential Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Noncontrolling interest Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount Change in uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Amount Adjustment to tax accounts Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Provision for income taxes Income Tax Expense (Benefit) Consideration transferred [Table Text Block] Consideration transferred [Table Text Block] Consideration transferred [Table Text Block] Schedule of Recognized Identified Assets Acquired and Liabilities Assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Business Acquisition, Pro Forma Information Business Acquisition, Pro Forma Information [Table Text Block] Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Sales Revenue, Services, Net Operating income Net income Basic earnings per common share (in dollars per share) Earnings Per Share, Basic Diluted earnings per common share (in dollars per share) Earnings Per Share, Diluted Income Statement [Abstract] Cost of revenues Cost of Services Gross profit Selling, general and administrative expenses Selling, General and Administrative Expense Operating income Other income (expense): Other Nonoperating Income (Expense) [Abstract] Interest expense Interest Expense Interest income Investment Income, Interest Other Other Nonoperating Income (Expense) Income before income tax expense Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Provision for federal, state and foreign income taxes Net income (loss) Less: Net income (loss) attributable to noncontrolling interest Net income (loss) attributable to Matrix Service Company Weighted average common shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Earnings Per Share [Abstract] Earnings Per Share, Basic and Diluted [Abstract] Earnings Per Share, Basic and Diluted [Abstract] Basic EPS: Earnings Per Share, Basic [Abstract] Weighted average shares outstanding Basic EPS (in dollars per share) Diluted EPS: Earnings Per Share, Diluted [Abstract] Dilutive stock options Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Dilutive nonvested deferred shares Incremental Common Shares Attributable to Dilutive Effect of Nonvested Shares with Forfeitable Dividends Diluted weighted average shares Diluted EPS (in dollars per share) Statement of Comprehensive Income [Abstract] Foreign currency translation adjustments, tax effect Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Carrying value of goodwill by segment Schedule of Goodwill [Table Text Block] Carrying value of other intangible assets Schedule Of Intangible Assets Excluding Goodwill Table [Table Text Block] Schedule of intangible assets excluding goodwill. Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Results of Operations Schedule of Segment Reporting Information, by Segment [Table Text Block] Summary of revenues and long lived assets according to geographic areas Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Schedule of Revenue by Major Customers by Reporting Segments Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] Debt Debt Disclosure [Text Block] Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Accounts receivable, less allowances (2017 - $9,887; 2016 - $8,403) Accounts Receivable, Net, Current Costs and estimated earnings in excess of billings on uncompleted contracts Costs in Excess of Billings, Current Inventories Inventory, Net Income taxes receivable Income Taxes Receivable, Current Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Current Other current assets Other Assets, Current Total current assets Assets, Current Property, plant and equipment, at cost: Property, Plant and Equipment, Gross [Abstract] Land and buildings Land Buildings And Improvements Gross Land Buildings And Improvements Gross Construction equipment Machinery and Equipment, Gross Transportation equipment Transportation Equipment Gross Transportation Equipment Gross Office equipment and software Office Equipment and Capitalized Computer Software Gross Office equipment and capitalized computer software gross. Construction in progress Construction in Progress, Gross Total property, plant and equipment - at cost Property, Plant and Equipment, Gross Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property, plant and equipment - net Property, Plant and Equipment, Net Other intangible assets Intangible Assets, Net (Excluding Goodwill) Deferred income taxes Other assets Other Assets, Noncurrent Total assets Liabilities and stockholders' equity Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Billings on uncompleted contracts in excess of costs and estimated earnings Billings in Excess of Cost Accrued wages and benefits Employee-related Liabilities, Current Accrued insurance Accrued Insurance, Current Income taxes payable Accrued Income Taxes, Current Deferred Tax Liabilities, Net, Current Deferred Tax Liabilities, Net, Current Other accrued expenses Other Liabilities, Current Total current liabilities Liabilities, Current Deferred income taxes Borrowings under senior revolving credit facility Long-term Line of Credit Other liabilities Liabilities, Other than Long-term Debt, Noncurrent Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock—$.01 par value; 60,000,000 shares authorized; 27,888,217 shares issued as of June 30, 2017 and June 30, 2016; 26,600,562 and 26,297,145 shares outstanding as of June 30, 2017 and June 30, 2016 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Total stockholders' equity before treasury stock Stockholders' Equity before Treasury Stock Less treasury stock, at cost — 1,287,655 and 1,591,072 shares as of June 30, 2017 and June 30, 2016 Treasury Stock, Value Total Matrix Service Company stockholders' equity Stockholders' Equity Attributable to Parent Noncontrolling interest Total stockholders' equity Total liabilities and stockholders' equity Liabilities and Equity Document And Entity Information [Abstract] Document And Entity Information [Abstract] Entities [Table] Entities [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Entity Information [Line Items] Entity Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Stock Options [Member] Employee Stock Option [Member] Nonvested Deferred Shares [Member] Nonvested Deferred Shares [Member] Nonvested Deferred Shares [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded From Computation Of Diluted Earnings Per Share Antidilutive Securities Excluded From Computation Of Diluted Earnings Per Share [Abstract] Antidilutive securities excluded from computation of diluted earnings per share. Antidilutive securities Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Income Taxes Income Tax Disclosure [Text Block] Organization and Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Precontract Costs Precontract Costs, Policy [Policy Text Block] Change Orders and Claims Recognition Change Orders And Claims Recognition [Policy Text Block] Disclosure of accounting policy for change orders and the recognition of claims. Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Accounts Receivable Receivables, Policy [Policy Text Block] Retentions Retention Payable [Policy Text Block] Retention payable. Loss Contingencies Commitments and Contingencies, Policy [Policy Text Block] Inventories Inventory, Policy [Policy Text Block] Depreciation Depreciation, Depletion, and Amortization [Policy Text Block] Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Other Intangible Assets Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Insurance Reserves Insurance Reserves [Policy Text Block] Disclosure of accounting policy for insurance reserves. Stock-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Foreign Currency Foreign Currency Transactions and Translations Policy [Policy Text Block] Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Reporting Unit [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] SM Electric Trade Name [Member] SM Electric Trade Name [Member] SM Electric Trade Name [Member] Intellectual Property [Member] Intellectual Property [Member] Customer based [Member] Customer Based [Member] Customer based member. Noncompete Agreements [Member] Noncompete Agreements [Member] Trade Names [Member] Trade Names [Member] Indefinite-lived Intangible Assets by Major Class [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Trade Names [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Amortization of Intangible Assets Finite-Lived Trade Names, Gross Finite-Lived Trade Names, Gross Finite-lived Intangible Assets, Fair Value Disclosure Finite-lived Intangible Assets, Fair Value Disclosure Carrying value of other intangible assets Intangible Assets, Net (Excluding Goodwill) [Abstract] Gross carrying amount Finite-Lived Intangible Assets, Gross Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Indefinite-lived trade names Indefinite-Lived Trade Names Intangible assets, gross, excluding Goodwill Intangible Assets, Gross (Excluding Goodwill) Accumulated amortization - Intangible assets, excluding Goodwill Intangible Assets Accumulated Amortization Excluding Goodwill Intangible assets accumulated amortization excluding goodwill. Intangible assets, net, excluding Goodwill Net book value of intangible asset at risk of impairment Net book value of intangible asset at risk of impairment Net book value of intangible asset at risk of impairment Components of pretax income Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest [Abstract] Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Schedule of Quarterly Financial Data (Unaudited) Quarterly Financial Information [Table Text Block] Components of the provision for income taxes Income Tax Expense (Benefit), Continuing Operations [Abstract] Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Foreign Current Foreign Tax Expense (Benefit) Total Current Income Tax Expense (Benefit) Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Foreign Deferred Foreign Income Tax Expense (Benefit) Total Deferred Income Tax Expense (Benefit) Schedule of sources of pretax income Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Components of the provision for income taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Difference between expected income tax provision applying domestic federal statutory tax rate and reported income tax provision Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Significant components of Company's deferred tax assets and liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Significant components of Company's deferred tax assets and liabilities as reported in consolidated balance sheets Schedule of Components of Deferred Tax Assets and Liabilities Net [Table Text Block] Schedule of components of deferred tax assets and Liabilities, net. Summary of Tax Credit Carryforwards Summary of Tax Credit Carryforwards [Table Text Block] Summary of Operating Loss Carryforwards Summary of Operating Loss Carryforwards [Table Text Block] Valuation and Qualifying Accounts Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Additional Paid-In Capital [Member] Retained Earnings [Member] Treasury Stock [Member] Open market purchase of treasury shares, shares Treasury Stock, Shares, Acquired Employee Stock Purchase Plans, shares Exercise of stock options, shares Issuance of deferred shares, shares Deferred Shares Issued Deferred Shares Issued Treasury shares repurchased to satisfy tax withholding obligations Other Treasury Shares Acquired Other treasury shares acquired. Employee Benefit Plans Compensation and Employee Benefit Plans [Text Block] Computation of basic and diluted earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of antidilutive securities excluded from computation of diluted earnings per share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Customer One [Member] Customer One [Member] Customer one. Customer Two [Member] Customer Two [Member] Customer two. Customer Three [Member] Customer Three [Member] Customer three. Customer Four [Member] Customer Four [Member] Customer four. Customer Five [Member] Customer Five [Member] [Member] Customer Five [Member] [Member] Customer Six [Member] Customer Six [Member] Customer Six [Member] Customer Seven [Member] Customer Seven [Member] Customer Seven [Member] Customer Eight [Member] Customer Eight [Member] Customer Eight [Member] Customer Nine [Member] Customer Nine [Member] Customer Nine [Member] Customer Ten [Member] Customer Ten [Member] Customer Ten [Member] Customer Eleven [Member] Customer Eleven [Member] Customer Eleven [Member] Another Customer [Member] Another Customer [Member] Another customer. Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Percentage of Revenue Concentration Risk, Percentage Contingencies Commitments and Contingencies Disclosure [Text Block] Nonvested deferred share activity Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Nonvested shares at June 30, 2016 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Shares granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Performance shares awarded in excess of target Performance shares Performance shares awarded in excess of target. Shares vested and released Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Shares cancelled Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Nonvested shares at June 30, 2017 Weighted average grant date fair value per share at June 30, 2016 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Weighted average grant date fair value per share granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value per performance shares Weighted average grant date fair value of performance shares The weighted average fair value at grant date for nonvested equity-based performance awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Weighted average grant date fair value per share vested and released Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value per share cancelled Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Weighted average grant date fair value per share at June 30, 2017 Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] State and Local Jurisdiction [Member] State and Local Jurisdiction [Member] Foreign Tax Authority [Member] Foreign Tax Authority [Member] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Domain] Income Tax Authority, Name [Domain] Tax Period [Axis] Tax Period [Axis] Tax Period [Domain] Tax Period [Domain] Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards, Limitations on Use Operating Loss Carryforwards, Limitations on Use Operating Loss Carryforwards Operating Loss Carryforwards Tax Credit Carryforward [Table] Tax Credit Carryforward [Table] Income Tax Authority, Description [Axis] Income Tax Authority, Description [Axis] Income Tax Authority: State, Federal and Foreign Income Tax Authority, Description [Domain] Income Tax Authority, Description [Domain] [Domain] for Income Tax Authority: State, Federal and Foreign State tax credit carryforward [Member] State tax credit [Member] Tax credit carryforwards from the state-level taxing authority. Federal tax credit carryforward [Member] Federal tax credit carryforward [Member] Federal tax credit carryforward [Member] Foreign tax credit carryforward [Member] Foreign tax credit carryforward [Member] Foreign tax credit carryforward [Member] Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward [Line Items] Tax Credit Carryforward [Line Items] Tax Credit Carryforward, Description Tax Credit Carryforward, Description Tax Credit Carryforward, Amount Tax Credit Carryforward, Amount Earnings per Common Share Earnings Per Share [Text Block] Schedule of Acquired Indefinite-lived Intangible Assets by Major Class [Table] Schedule of Acquired Indefinite-lived Intangible Assets by Major Class [Table] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] CDOR Rate [Member] CDOR Rate [Member] CDOR Rate [Member] Canadian Prime Rate [Member] Canadian Prime Rate [Member] Canadian Prime Rate [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Debt (Textual) [Abstract] Debt (Textual) [Abstract] Debt. Senior revolving credit facility Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Expiration Date Line of Credit Facility, Expiration Date Leverage Ratio, Maximum Senior Leverage Ratio Maximum Senior leverage ratio maximum. Leverage Ratio, Minimum Senior Leverage Ratio Minimum Senior leverage ratio minimum. Fixed Charge Coverage Ratio, Maximum Fixed Charge Coverage Ratio Maximum Fixed charge coverage ratio maximum. Fixed Charge Coverage Ratio, Minimum Fixed Charge Coverage Ratio Minimum Fixed charge coverage ratio minimum. Limit on asset dispositions Amount Of Limit On Asset Dispositions Amount of limit on asset dispositions. Sublimit on Australian Dollar, Canadian Dollar, Euro and Pounds Sterling Sublimit on Australian Dollar, Canadian Dollar, Euro and Pounds Sterling Sublimit on Australian Dollar, Canadian Dollar, Euro and Pounds Sterling Sublimit on letters of credit under the credit facility Sub-limit on letters of credit under the credit facility Sub-limit on letters of credit under the credit facility. Additional Margin on alternate base rate loans, Minimum Line Of Credit Basis Spread On Alternate Base Rate Minimum Line of credit basis spread on alternate base rate minimum. Additional Margin on alternate base rate loans, Maximum Line Of Credit Basis Spread On Alternate Base Rate Maximum Line of credit basis spread on alternate base rate maximum. Line Of Credit Basis Spread On Adjusted LIBO, EURIBO and CDOR Minimum Line Of Credit Basis Spread On Adjusted LIBO, EURIBO and CDOR Minimum Line of credit basis spread on Adjusted LIBO, EURIBO and CDOR loans rate minimum. Line Of Credit Basis Spread On Adjusted LIBO, EURIBO and CDOR Maximum Line Of Credit Basis Spread On Adjusted LIBO, EURIBO and CDOR Maximum Line of credit basis spread on Adjusted LIBO, EURIBO and CDOR loans rate maximum. Line Of Credit Basis Spread On Canadian Prime Rate Minimum Line Of Credit Basis Spread On Canadian Prime Rate Minimum Line of credit basis spread on Canadian prime rate minimum. Line Of Credit Basis Spread On Canadian Prime Rate Maximum Line Of Credit Basis Spread On Canadian Prime Rate Maximum Line of credit basis spread on Canadian prime rate maximum. Unused Credit Facility Fee Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Maximum limit of consolidated funded indebtedness Maximum Limit Of Consolidated Funded Indebtedness Maximum limit of consolidated funded indebtedness. Consolidated EBITDA as defined in the Credit Agreement Consolidated Earnings Before Interest Taxes Depreciation And Amortization Per Credit Agreement Consolidated earnings before interest taxes depreciation and amortization per credit. Consolidated Funded Indebtedness Consolidated Funded Indebtedness Consolidated Funded Indebtedness Subsequent Events [Abstract] Subsequent Events [Abstract] Subsequent Event, Description Subsequent Event, Description Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Foreign currency translation loss (net of tax of $180, $236 and $606 for the years ended June 30, 2017, 2016 and 2015, respectively) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: Comprehensive income (loss) attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income (loss) attributable to Matrix Service Company Comprehensive Income (Loss), Net of Tax, Attributable to Parent Multiemployer Pension Plans Schedule of Multiemployer Plans [Table Text Block] Boilermaker-Blacksmith National Pension Trust [Member] Boilermaker Blacksmith National Pension Trust [Member] Boilermaker blacksmith national pension trust. Joint Pension Fund Local Union One Six Four Ibew [Member] Joint Pension Fund Local Union One Six Four Ibew [Member] Joint pension fund local union 164 Ibew. Joint Pension Fund Local Union Number One Zero Two [Member] [Domain] Joint Pension Fund Local Union Number One Zero Two [Member] [Domain] [Domain] for Joint Pension Fund Local Union Number One Zero Two IBEW Local Four Five Six Pension Plan [Member] [Domain] IBEW Local Four Five Six Pension Plan [Member] [Domain] [Domain] for IBEW Local Four Five Six Pension Plan Local 351 IBEW Pension Plan [Member] Local Three Five One Ibew Pension Plan [Member] Local 351 Ibew pension plan. Steamfitters Local Union Number Four Two Zero Pension Plan [Member] [Domain] Steamfitters Local Union Number Four Two Zero Pension Plan [Member] [Domain] [Domain] for Steamfitters Local Union Number Four Two Zero Pension Plan IBEW Local Union Nine Eight Pension Plan [Member] IBEW Local Union Nine Eight Pension Plan [Member] IBEW Local Union Nine Eight Pension Plan [Member] Indiana Laborers Pension Fund [Domain] Indiana Laborers Pension Fund [Domain] Indiana Laborers Pension Fund [Domain] Ironworkers Mid-America Pension Plan [Member] Ironworkers Mid-America Pension Plan [Member] Ironworkers Mid-America Pension Plan [Member] Pipefitters Retirement Fund Local Five Nine Seven [Member] Pipefitters Retirement Fund Local Five Nine Seven [Member] Pipefitters Retirement Fund Local Five Nine Seven [Member] Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date, Description Multiemployer Plans, Collective-Bargaining Arrangement, Description Multiemployer Pension Plans Multiemployer Plans [Abstract] EIN/Pension Plan Number Multiemployer Plans Number Multiemployer plans number. Multiemployer Plans, Certified Zone Status, Description Multiemployer Plans, Certified Zone Status, Description Multiemployer Plans, Certified Zone Status, Description Pension Protection Act Zone Status Multiemployer Plans, Certified Zone Status FIP/RP Status Pending or Implemented Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan Total contributions made Multiemployer Plan, Period Contributions Multiemployer Plan, Surcharge Multiemployer Plan, Surcharge Multiemployer Plan, Surcharge Surcharge Imposed Multiemployer Plans, Surcharge Expiration Date of Collective-Bargaining Agreement Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date Contributions to other multiemployer plans Contributions To Other Multiemployer Plans Contributions to other multiemployer plans. Availability under senior credit facility Line of Credit Facility [Abstract] Capacity Constraint Due To Senior Leverage Ratio Capacity Constraint Due To Senior Leverage Ratio Capacity constraint due to the Senior Leverage Ratio. Line Of Credit Facility Maximum Borrowing Capacity After Consideration Of Capacity Constraint Line Of Credit Facility Maximum Borrowing Capacity After Consideration Of Capacity Constraint Line of credit facility maximum borrowing capacity after consideration of capacity constraint. Borrowings outstanding Letters of credit issued Letters Of Credit Issued Letters of credit issued, excluding insurance-related letters of credit. Availability under the senior credit facility Line of Credit Facility, Remaining Borrowing Capacity Gross and net amount of uncompleted contracts Receivables, Long-term Contracts or Programs [Abstract] Costs and estimated earnings recognized on uncompleted contracts Uncompleted Contracts Costs Incurred And Estimated Earnings Recognized Uncompleted contracts costs incurred and estimated earnings recognized. Billings on uncompleted contracts Uncompleted Contracts Billings Uncompleted contracts billings. Total Uncompleted Contracts Net Uncompleted contracts. Shown on balance sheet as: Balance Sheet Balance sheet. Billings on uncompleted contracts in excess of costs and estimated earnings Total Costs in Excess of Billings