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Acquisitions (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2015
Sep. 30, 2014
Dec. 31, 2013
Dec. 21, 2013
Business Acquisition [Line Items]            
Goodwill $ 69,837 $ 30,836 $ 71,518      
Pro Forma Information:            
Revenues 1,397,706 1,096,267        
Net income attributable to Matrix Service Company $ 38,786 $ 28,444        
Basic earnings per common share (in dollars per share) $ 1.48 $ 1.10        
Diluted earnings per common share (in dollars per share) $ 1.44 $ 1.08        
HDB, Inc. [Member]            
Business Acquisition [Line Items]            
Net assets acquired       $ 5,600    
Kvaerner North American Construction [Member]            
Business Acquisition [Line Items]            
Current assets           $ 83,575
Property, plant and equipment           11,377
Goodwill         $ 39,295 39,295
Tax deductible goodwill           30,700
Other intangible assets           24,009
Total assets acquired           158,256
Current liabilities           68,115
Deferred income taxes           1,179
Noncontrolling interest of consolidated joint venture           700
Net assets acquired         $ 88,262 88,262
Cash acquired           $ 36,655