v3.8.0.1
Document and Entity Information - shares
6 Months Ended
Dec. 31, 2017
Feb. 05, 2018
Document Documentand Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Dec. 31, 2017  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q2  
Trading Symbol MTRX  
Entity Registrant Name MATRIX SERVICE CO  
Entity Central Index Key 0000866273  
Current Fiscal Year End Date --06-30  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   26,817,064