v3.26.3
Document and Entity Information
Sep. 17, 2026
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Sep. 17, 2026
Entity File Number 001-34481
Entity Registrant Name Mistras Group, Inc.
Entity Central Index Key 0001436126
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 22-3341267
Entity Address, Address Line One 195 Clarksville Road
Entity Address, City or Town Princeton Junction
Entity Address, State or Province NJ
Entity Address, Postal Zip Code 08550
City Area Code 609
Local Phone Number 716-4000
Title of 12(b) Security Common Stock, $0.01 par value
Trading Symbol MG
Security Exchange Name NYSE
Entity Emerging Growth Company false
Written Communications false
Soliciting Material true
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false