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Document and Entity Information (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Jun. 30, 2012
Sep. 04, 2012
Document And Entity Information [Abstract]    
Entity Registrant Name MATRIX SERVICE CO  
Entity Central Index Key 0000866273  
Document Type 10-K  
Document Period End Date Jun. 30, 2012  
Amendment Flag false  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus FY  
Current Fiscal Year End Date --06-30  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Filer Category Accelerated Filer  
Entity Public Float $ 240  
Entity Common Stock, Shares Outstanding   25,819,853