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Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 12, 2016 | Feb. 01, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition Related Adjustment for Final Working Capital Settlement |  |  |  | $ 88 |  |
Accrued working capital adjustment |  |  | $ 0 | 1,687 | $ 0 |
Goodwill |  |  | $ 96,162 | 113,501 | 78,293 | $ 71,518
Houston Interests, LLC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net purchase price | $ 42,506 |  |  |  |  |
Cash paid for equity interest | 46,000 |  |  |  |  |
Acquisition Related Adjustment for Final Working Capital Settlement | 6,837 |  |  |  |  |
Cash consideration paid | 42,506 |  |  |  |  |
Accounts receivable | 10,273 |  |  |  |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | 746 |  |  |  |  |
Other current assets | 454 |  |  |  |  |
Current assets | 21,804 |  |  |  |  |
Property, plant and equipment | 942 |  |  |  |  |
Tax deductible goodwill | 35,146 |  |  |  |  |
Other intangible assets | 10,220 |  |  |  |  |
Total assets acquired | 68,112 |  |  |  |  |
Accounts payable | 962 |  |  |  |  |
Billings on uncompleted contracts in excess of costs and estimated earnings | 11,648 |  |  |  |  |
Other accrued expenses | 2,475 |  |  |  |  |
Current liabilities | 15,085 |  |  |  |  |
Other liabilities | 190 |  |  |  |  |
Net assets acquired | 52,837 |  |  |  |  |
Cash acquired | $ 10,331 |  |  |  |  |
Pro Forma Information: |  |  |  |  |  |
Revenues |  |  |  | 1,233,372 | 1,427,313 |
Net income attributable to Matrix Service Company |  |  |  | $ 7,326 | $ 32,352 |
Basic earnings per common share (in dollars per share) |  |  |  | $ 0.28 | $ 1.22 |
Diluted earnings per common share (in dollars per share) |  |  |  | $ 0.27 | $ 1.19 |
Pro forma acquisition costs |  |  |  | $ 3,300 |  |
Pro forma acquisition costs, amortized over time |  |  |  | 800 | $ 900 |
Pro forma interest expense |  |  |  | 700 | 1,400 |
Pro forma depreciation and amortization expense |  |  |  | 1,400 | 1,800 |
Pro forma income tax expense |  |  |  | $ 2,000 | $ 2,200 |
Baillie Tank Equipment, Ltd. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net purchase price |  | $ 13,049 |  |  |  |
Current assets |  | 5,574 |  |  |  |
Property, plant and equipment |  | 4,347 |  |  |  |
Goodwill |  | 7,030 |  |  |  |
Other intangible assets |  | 720 |  |  |  |
Other assets |  | 233 |  |  |  |
Total assets acquired |  | 17,904 |  |  |  |
Current liabilities |  | 1,669 |  |  |  |
Deferred income taxes |  | 329 |  |  |  |
Long-term debt |  | 1,858 |  |  |  |
Other liabilities |  | 407 |  |  |  |
Net assets acquired |  | 13,641 |  |  |  |
Cash acquired |  | $ 592 |  |  |  |

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