Basis of Presentation (Notes)	6 Months Ended
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation and Accounting Policies The condensed consolidated financial statements include the accounts of Matrix Service Company (“Matrix”, “we”, “our”, “us”, “its” or the “Company”) and its subsidiaries, unless otherwise indicated. Intercompany balances and transactions have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with Rule 10-01 of Regulation S-X for interim financial statements required to be filed with the Securities and Exchange Commission and do not include all information and footnotes required by generally accepted accounting principles for complete financial statements. The information furnished reflects all adjustments, consisting of normal recurring adjustments, that are, in the opinion of management, necessary for a fair statement of the results of operations, cash flows and financial position for the interim periods presented. The accompanying condensed financial statements should be read in conjunction with the audited financial statements for the year ended June 30, 2016, included in the Company’s Annual Report on Form 10-K for the year then ended. The results of operations for the six month period ended December 31, 2016 may not necessarily be indicative of the results of operations for the full year ending June 30, 2017. Recently Issued Accounting Standards Accounting Standards Update 2014-09, Revenue from Contracts with Customers (Topic 606) On May 28, 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09. The standard outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The core principle of the revenue model is that “an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.” The ASU also requires entities to disclose both quantitative and qualitative information that enables users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The ASU's disclosure requirements are significantly more comprehensive than those in existing revenue standards. The ASU applies to all contracts with customers except those that are within the scope of other topics in the FASB Accounting Standards Codification ("ASC"). The ASU is effective for annual reporting periods beginning after December 15, 2017, with early adoption permitted on a limited basis. Upon adoption, the Company may elect one of two application methods, a full retrospective application or a modified retrospective application. We expect to adopt this standard on July 1, 2018 and are currently evaluating its expected impact on our financial statements. Accounting Standards Update 2014-15, Presentation of Financial Statements-Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern On August 27, 2014, the FASB issued ASU 2014-15, which provides guidance on determining when and how reporting entities must disclose going-concern uncertainties in their financial statements. The new standard requires management to perform interim and annual assessments of an entity’s ability to continue as a going concern within one year of the date of issuance of the entity’s financial statements. Further, an entity must provide certain disclosures if there is “substantial doubt about the entity’s ability to continue as a going concern.” The FASB believes that requiring management to perform the assessment will enhance the timeliness, clarity, and consistency of related disclosures and improve convergence with international financial reporting standards ("IFRSs") (which emphasize management’s responsibility for performing the going-concern assessment). However, the time horizon for the assessment (look-forward period) and the disclosure thresholds under U.S. GAAP and IFRSs will continue to differ. The ASU is effective for annual periods ending after December 15, 2016, and interim periods thereafter; early adoption is permitted. The ASU was adopted during the Company's first fiscal quarter ending September 30, 2016. In connection with the adoption of the ASU, the Company now performs an assessment of its ability to continue as a going concern on a quarterly basis. Disclosure regarding the status of the Company's ability to continue as a going concern is required when there are conditions or events that raise substantial doubt about its ability to continue as a going concern within one year after the date that the financial statements are issued. Accounting Standards Update 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments On September 25, 2015, the FASB issued ASU 2015-16 to simplify the accounting for measurement-period adjustments. The ASU was issued in response to stakeholder feedback that restatements of prior periods to reflect adjustments made to provisional amounts recognized in a business combination increase the cost and complexity of financial reporting but do not significantly improve the usefulness of the information. Under the ASU, an acquirer must recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The ASU also requires acquirers to present separately on the face of the income statement, or disclose in the notes, the portion of the amount recorded in current-period earnings by line item that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of the acquisition date. For public business entities, the ASU is effective for fiscal years beginning after December 15, 2015, including interim periods within those fiscal years. We adopted this standard on July 1, 2016 with no material impact to the Company's financial statements. Accounting Standards Update 2016-02, Leases (Topic 842) On February 25, 2016, the FASB issued ASU 2016-02. The amendments in this update require, among other things, that lessees recognize the following for all leases (with the exception of short-term leases) at the commencement date: (1) a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and (2) a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Lessees and lessors must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. For public business entities, the ASU is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. We are currently evaluating the ASU's expected impact on our financial statements. Accounting Standards Update 2016-09, Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting On March 30, 2016, the FASB issued ASU 2016-09, which simplified several aspects of accounting for stock-based compensation transactions, including the accounting for income taxes and forfeitures and statutory tax withholding requirements. The ASU is effective for the Company on July 1, 2017 and early adoption is permitted. The Company adopted the ASU during its first fiscal quarter ending September 30, 2016. The following is a description of the key provisions of the ASU and their impacts to the Company's financial statements: Accounting for Income Taxes: The amendments require the Company to recognize excess tax benefits or tax deficiencies in its provision for income taxes in its consolidated statements of income during the period of vesting or exercise of its nonvested deferred share awards and stock options, respectively, for which it expects to receive an income tax deduction. Previously, the Company recognized any excess tax benefits in additional paid-in capital ("APIC") in the balance sheet and any tax deficiencies were recognized as a reduction of APIC to the extent the Company has accumulated excess tax benefits. Any tax deficiencies in excess of accumulated excess tax benefits in APIC were recognized in the provision for income taxes. The amendments also require the Company to only present excess tax benefits and tax deficiencies in the operating section of its statements of cash flows as a component of deferred tax activity. Previously, the Company was required to present such items in both the financing section and operating section of its statements of cash flows. Amendments related to the recognition of excess tax benefits and tax deficiencies in income are required to be applied prospectively, and amendments related to the cash flow statement presentation of excess tax benefits and tax deficiencies may be applied either retrospectively or prospectively. The Company applied the amendments requiring the recognition of excess tax benefits and tax deficiencies in income prospectively. As a result, the Company recognized $0.1 million and $0.5 million of excess tax benefits in its provision for income taxes during the three and six months ended December 31, 2016, respectively, which increased basic and diluted earnings per share by $0.01 and $0.02, respectively. Under the prior accounting standard, the Company would have recognized the excess tax benefits in equity as additional paid-in capital. The amendments relating to the presentation of excess tax benefits and tax deficiencies in the statement of cash flows were applied retrospectively. The effect of the retrospective adjustment was to eliminate the presentation of an operating cash outflow and a financing cash inflow for excess tax benefits on exercised stock options and vesting of deferred shares. These eliminations increased net cash provided by operating activities by $3.2 million and decreased net cash provided by financing activities by $3.2 million for the six months ended December 31, 2015. Net cash flows did not change as a result of the retrospective adjustment. Accounting for Forfeitures: The amendments in this ASU allow the Company to elect, as a company-wide accounting policy, either to continue to estimate the amount of forfeitures to exclude from compensation expense or to exclude forfeitures from compensation expense as they occur. Upon the adoption of the ASU during the first quarter of fiscal 2017, the Company elected to account for forfeitures as they occur. The Company is required to apply these amendments on a modified retrospective basis with a cumulative adjustment to retained earnings as of the beginning of the fiscal year. The Company recorded a modified retrospective adjustment to reduce the June 30, 2016 retained earnings balance and increase the additional paid-in capital balance by $0.1 million each. Statutory Tax Withholding Requirements: Under the prior accounting standard, an entire award must be classified as a liability if the fair value of the shares withheld exceeds the Company's minimum statutory withholding obligation. Under the ASU, the Company is allowed to withhold shares with a fair value up to the amount of tax owed using the maximum statutory tax rate in the employee's applicable jurisdictions. The Company is allowed to determine one maximum rate for all employees in each jurisdiction, rather than a rate for each employee in the jurisdiction. Also, the ASU requires that cash outflows to reacquire shares withheld for taxes to be classified in the financing section of the statement of cash flows. The Company adopted the ASU during the first quarter of fiscal 2017. Since the Company did not have any awards classified as liabilities due to statutory tax withholding requirements as of December 31, 2016, and since the Company already presented its cash outflows for reacquiring shares withheld for taxes as a financing activity in its statements of cash flows, these amendments did not have any impact on its financial statements upon adoption. The Company does not expect changes to employee withholdings for stock compensation to have a material impact to the financial statements. Accounting Standards Update 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments On June 16, 2016, the FASB issued ASU 2016-13, which will change how the Company accounts for its allowance for uncollectible accounts. The amendments in this update require a financial asset (or a group of financial assets) to be presented at the net amount expected to be collected. The income statement will reflect any increases or decreases of expected credit losses that have taken place during the period. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectibility of the reported amount. Current GAAP delays the recognition of the full amount of credit losses until the loss is probable of occurring. The amendments in this update eliminate the probable initial recognition threshold and, instead, reflect the Company's current estimate of all expected credit losses. In addition, current guidance limits the information the Company may consider in measuring a credit loss to its past events and current conditions. The amendments in this update broaden the information the Company may consider in developing its expected credit loss estimate to include forecasted information. The amendments in this update are effective for the Company on July 1, 2020 and the Company may early adopt on July 1, 2019. The Company must apply the amendments in this update through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. At this time, the Company does not expect this update to have a material impact to its estimate of the allowance for uncollectible accounts.

Basis of Presentation and Accounting Policies

The condensed consolidated financial statements include the accounts of Matrix Service Company (“Matrix”, “we”, “our”, “us”, “its” or the “Company”) and its subsidiaries, unless otherwise indicated. Intercompany balances and transactions have been eliminated in consolidation.

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with Rule 10-01 of Regulation S-X for interim financial statements required to be filed with the Securities and Exchange Commission and do not include all information and footnotes required by generally accepted accounting principles for complete financial statements. The information furnished reflects all adjustments, consisting of normal recurring adjustments, that are, in the opinion of management, necessary for a fair statement of the results of operations, cash flows and financial position for the interim periods presented. The accompanying condensed financial statements should be read in conjunction with the audited financial statements for the year ended June 30, 2016, included in the Company’s Annual Report on Form 10-K for the year then ended. The results of operations for the six month period ended December 31, 2016 may not necessarily be indicative of the results of operations for the full year ending June 30, 2017.

Recently Issued Accounting Standards

Accounting Standards Update 2014-09, Revenue from Contracts with Customers (Topic 606)

On May 28, 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09. The standard outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The core principle of the revenue model is that “an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.” The ASU also requires entities to disclose both quantitative and qualitative information that enables users of financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The ASU's disclosure requirements are significantly more comprehensive than those in existing revenue standards. The ASU applies to all contracts with customers except those that are within the scope of other topics in the FASB Accounting Standards Codification ("ASC").

The ASU is effective for annual reporting periods beginning after December 15, 2017, with early adoption permitted on a limited basis. Upon adoption, the Company may elect one of two application methods, a full retrospective application or a modified retrospective application. We expect to adopt this standard on July 1, 2018 and are currently evaluating its expected impact on our financial statements.

Accounting Standards Update 2014-15, Presentation of Financial Statements-Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern

On August 27, 2014, the FASB issued ASU 2014-15, which provides guidance on determining when and how reporting entities must disclose going-concern uncertainties in their financial statements. The new standard requires management to perform interim and annual assessments of an entity’s ability to continue as a going concern within one year of the date of issuance of the entity’s financial statements. Further, an entity must provide certain disclosures if there is “substantial doubt about the entity’s ability to continue as a going concern.” The FASB believes that requiring management to perform the assessment will enhance the timeliness, clarity, and consistency of related disclosures and improve convergence with international financial reporting standards ("IFRSs") (which emphasize management’s responsibility for performing the going-concern assessment). However, the time horizon for the assessment (look-forward period) and the disclosure thresholds under U.S. GAAP and IFRSs will continue to differ. The ASU is effective for annual periods ending after December 15, 2016, and interim periods thereafter; early adoption is permitted.

The ASU was adopted during the Company's first fiscal quarter ending September 30, 2016. In connection with the adoption of the ASU, the Company now performs an assessment of its ability to continue as a going concern on a quarterly basis. Disclosure regarding the status of the Company's ability to continue as a going concern is required when there are conditions or events that raise substantial doubt about its ability to continue as a going concern within one year after the date that the financial statements are issued.

Accounting Standards Update 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments

On September 25, 2015, the FASB issued ASU 2015-16 to simplify the accounting for measurement-period adjustments. The ASU was issued in response to stakeholder feedback that restatements of prior periods to reflect adjustments made to provisional amounts recognized in a business combination increase the cost and complexity of financial reporting but do not significantly improve the usefulness of the information. Under the ASU, an acquirer must recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The ASU also requires acquirers to present separately on the face of the income statement, or disclose in the notes, the portion of the amount recorded in current-period earnings by line item that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of the acquisition date. For public business entities, the ASU is effective for fiscal years beginning after December 15, 2015, including interim periods within those fiscal years. We adopted this standard on July 1, 2016 with no material impact to the Company's financial statements.

Accounting Standards Update 2016-02, Leases (Topic 842)

On February 25, 2016, the FASB issued ASU 2016-02. The amendments in this update require, among other things, that lessees recognize the following for all leases (with the exception of short-term leases) at the commencement date: (1) a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and (2) a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Lessees and lessors must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. For public business entities, the ASU is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. We are currently evaluating the ASU's expected impact on our financial statements.

Accounting Standards Update 2016-09, Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting

On March 30, 2016, the FASB issued ASU 2016-09, which simplified several aspects of accounting for stock-based compensation transactions, including the accounting for income taxes and forfeitures and statutory tax withholding requirements. The ASU is effective for the Company on July 1, 2017 and early adoption is permitted. The Company adopted the ASU during its first fiscal quarter ending September 30, 2016. The following is a description of the key provisions of the ASU and their impacts to the Company's financial statements:

Accounting for Income Taxes: The amendments require the Company to recognize excess tax benefits or tax deficiencies in its provision for income taxes in its consolidated statements of income during the period of vesting or exercise of its nonvested deferred share awards and stock options, respectively, for which it expects to receive an income tax deduction. Previously, the Company recognized any excess tax benefits in additional paid-in capital ("APIC") in the balance sheet and any tax deficiencies were recognized as a reduction of APIC to the extent the Company has accumulated excess tax benefits. Any tax deficiencies in excess of accumulated excess tax benefits in APIC were recognized in the provision for income taxes. The amendments also require the Company to only present excess tax benefits and tax deficiencies in the operating section of its statements of cash flows as a component of deferred tax activity. Previously, the Company was required to present such items in both the financing section and operating section of its statements of cash flows. Amendments related to the recognition of excess tax benefits and tax deficiencies in income are required to be applied prospectively, and amendments related to the cash flow statement presentation of excess tax benefits and tax deficiencies may be applied either retrospectively or prospectively.

The Company applied the amendments requiring the recognition of excess tax benefits and tax deficiencies in income prospectively. As a result, the Company recognized $0.1 million and $0.5 million of excess tax benefits in its provision for income taxes during the three and six months ended December 31, 2016, respectively, which increased basic and diluted earnings per share by $0.01 and $0.02, respectively. Under the prior accounting standard, the Company would have recognized the excess tax benefits in equity as additional paid-in capital. The amendments relating to the presentation of excess tax benefits and tax deficiencies in the statement of cash flows were applied retrospectively. The effect of the retrospective adjustment was to eliminate the presentation of an operating cash outflow and a financing cash inflow for excess tax benefits on exercised stock options and vesting of deferred shares. These eliminations increased net cash provided by operating activities by $3.2 million and decreased net cash provided by financing activities by $3.2 million for the six months ended December 31, 2015. Net cash flows did not change as a result of the retrospective adjustment.

Accounting for Forfeitures: The amendments in this ASU allow the Company to elect, as a company-wide accounting policy, either to continue to estimate the amount of forfeitures to exclude from compensation expense or to exclude forfeitures from compensation expense as they occur. Upon the adoption of the ASU during the first quarter of fiscal 2017, the Company elected to account for forfeitures as they occur. The Company is required to apply these amendments on a modified retrospective basis with a cumulative adjustment to retained earnings as of the beginning of the fiscal year. The Company recorded a modified retrospective adjustment to reduce the June 30, 2016 retained earnings balance and increase the additional paid-in capital balance by $0.1 million each.

Statutory Tax Withholding Requirements: Under the prior accounting standard, an entire award must be classified as a liability if the fair value of the shares withheld exceeds the Company's minimum statutory withholding obligation. Under the ASU, the Company is allowed to withhold shares with a fair value up to the amount of tax owed using the maximum statutory tax rate in the employee's applicable jurisdictions. The Company is allowed to determine one maximum rate for all employees in each jurisdiction, rather than a rate for each employee in the jurisdiction. Also, the ASU requires that cash outflows to reacquire shares withheld for taxes to be classified in the financing section of the statement of cash flows.

The Company adopted the ASU during the first quarter of fiscal 2017. Since the Company did not have any awards classified as liabilities due to statutory tax withholding requirements as of December 31, 2016, and since the Company already presented its cash outflows for reacquiring shares withheld for taxes as a financing activity in its statements of cash flows, these amendments did not have any impact on its financial statements upon adoption. The Company does not expect changes to employee withholdings for stock compensation to have a material impact to the financial statements.

Accounting Standards Update 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments

On June 16, 2016, the FASB issued ASU 2016-13, which will change how the Company accounts for its allowance for uncollectible accounts. The amendments in this update require a financial asset (or a group of financial assets) to be presented at the net amount expected to be collected. The income statement will reflect any increases or decreases of expected credit losses that have taken place during the period. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectibility of the reported amount.

Current GAAP delays the recognition of the full amount of credit losses until the loss is probable of occurring. The amendments in this update eliminate the probable initial recognition threshold and, instead, reflect the Company's current estimate of all expected credit losses. In addition, current guidance limits the information the Company may consider in measuring a credit loss to its past events and current conditions. The amendments in this update broaden the information the Company may consider in developing its expected credit loss estimate to include forecasted information.

The amendments in this update are effective for the Company on July 1, 2020 and the Company may early adopt on July 1, 2019. The Company must apply the amendments in this update through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. At this time, the Company does not expect this update to have a material impact to its estimate of the allowance for uncollectible accounts.