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Subsequent Events	9 Months Ended
	Sep. 30, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 9, 2023, Sotirios Vahaviolos retired as Executive Chairman of the Board (the “Board”) of Mistras Group, Inc., but remains employed as a Senior Advisor to the Chief Executive Officer. In addition, Dr. Vahaviolos continues to serve as a member of the Board and as Chairman Emeritus. On the same day, the Board elected Manuel N. Stamatakis to serve as Chairman of the Board to succeed Dr. Vahaviolos in that role. On October 9, 2023, the Board also approved the termination without cause of Dennis Bertolotti as the Company’s President and Chief Executive Officer. In connection with his termination as President and Chief Executive Officer, Mr. Bertolotti resigned as a director, effective immediately. The Board appointed Mr. Stamatakis to serve as interim President and Chief Executive Officer until a permanent President and Chief Executive Officer is appointed. The Company expects to record approximately $2.6 million during the fourth quarter of 2023 related to the termination.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//855/tableOfContent

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483399/855-10-50-2

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