Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2015	Aug. 31, 2015	Dec. 31, 2014
Entity Information [Line Items]
Entity Registrant Name	MATRIX SERVICE CO
Entity Central Index Key	0000866273
Document Type	10-K
Document Period End Date	Jun. 30, 2015
Amendment Flag	false
Document Fiscal Year Focus	2015
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			$ 589
Entity Common Stock, Shares Outstanding		26,381,791