Document and Entity Information	9 Months Ended
	Feb. 28, 2013	Apr. 01, 2013
Document and Entity Information
Entity Registrant Name	Mistras Group, Inc.
Entity Central Index Key	0001436126
Document Type	10-Q
Document Period End Date	Feb. 28, 2013
Amendment Flag	false
Current Fiscal Year End Date	--05-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		28,194,980
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3