{"cik":1436126,"taxonomy":"us-gaap","tag":"LongTermDebt","label":"Long-term Debt","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","entityName":"Mistras Group, Inc.","units":{"USD":[{"end":"2012-05-31","val":40229000,"accn":"0001104659-12-068453","fy":2013,"fp":"Q1","form":"10-Q","filed":"2012-10-10"},{"end":"2012-05-31","val":40229000,"accn":"0001104659-13-001511","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-01-09"},{"end":"2012-05-31","val":40229000,"accn":"0001104659-13-028029","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-04-09"},{"end":"2012-05-31","val":40229000,"accn":"0001104659-13-064031","fy":2013,"fp":"FY","form":"10-K","filed":"2013-08-14","frame":"CY2012Q2I"},{"end":"2012-08-31","val":23676000,"accn":"0001104659-12-068453","fy":2013,"fp":"Q1","form":"10-Q","filed":"2012-10-10","frame":"CY2012Q3I"},{"end":"2012-11-30","val":59665000,"accn":"0001104659-13-001511","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-01-09","frame":"CY2012Q4I"},{"end":"2013-02-28","val":72940000,"accn":"0001104659-13-028029","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-04-09","frame":"CY2013Q1I"},{"end":"2013-05-31","val":60267000,"accn":"0001104659-13-064031","fy":2013,"fp":"FY","form":"10-K","filed":"2013-08-14"},{"end":"2013-05-31","val":60267000,"accn":"0001104659-13-074895","fy":2014,"fp":"Q1","form":"10-Q","filed":"2013-10-09"},{"end":"2013-05-31","val":60267000,"accn":"0001104659-14-001415","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-01-09"},{"end":"2013-05-31","val":60267000,"accn":"0001104659-14-026699","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-04-09"},{"end":"2013-05-31","val":60267000,"accn":"0001104659-14-058909","fy":2014,"fp":"FY","form":"10-K","filed":"2014-08-08","frame":"CY2013Q2I"},{"end":"2013-08-31","val":52900000,"accn":"0001104659-13-074895","fy":2014,"fp":"Q1","form":"10-Q","filed":"2013-10-09","frame":"CY2013Q3I"},{"end":"2013-11-30","val":78698000,"accn":"0001104659-14-001415","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-01-09","frame":"CY2013Q4I"},{"end":"2014-02-28","val":81425000,"accn":"0001104659-14-026699","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-04-09","frame":"CY2014Q1I"},{"end":"2014-05-31","val":76648000,"accn":"0001104659-14-058909","fy":2014,"fp":"FY","form":"10-K","filed":"2014-08-08"},{"end":"2014-05-31","val":76648000,"accn":"0001104659-14-071044","fy":2015,"fp":"Q1","form":"10-Q","filed":"2014-10-09"},{"end":"2014-05-31","val":76648000,"accn":"0001436126-15-000004","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-01-09"},{"end":"2014-05-31","val":76648000,"accn":"0001436126-15-000010","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-04-09"},{"end":"2014-05-31","val":76648000,"accn":"0001436126-15-000018","fy":2015,"fp":"FY","form":"10-K","filed":"2015-08-12","frame":"CY2014Q2I"},{"end":"2014-08-31","val":136107000,"accn":"0001104659-14-071044","fy":2015,"fp":"Q1","form":"10-Q","filed":"2014-10-09","frame":"CY2014Q3I"},{"end":"2014-11-30","val":155068000,"accn":"0001436126-15-000004","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-01-09","frame":"CY2014Q4I"},{"end":"2015-02-28","val":126228000,"accn":"0001436126-15-000010","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-04-09","frame":"CY2015Q1I"},{"end":"2015-05-31","val":113459000,"accn":"0001436126-15-000018","fy":2015,"fp":"FY","form":"10-K","filed":"2015-08-12"},{"end":"2015-05-31","val":113459000,"accn":"0001436126-15-000026","fy":2016,"fp":"Q1","form":"10-Q","filed":"2015-10-13"},{"end":"2015-05-31","val":113459000,"accn":"0001436126-16-000037","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-01-08"},{"end":"2015-05-31","val":113459000,"accn":"0001436126-16-000049","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-04-07"},{"end":"2015-05-31","val":113459000,"accn":"0001436126-16-000062","fy":2016,"fp":"FY","form":"10-K","filed":"2016-08-15"},{"end":"2015-05-31","val":113459000,"accn":"0001436126-17-000024","fy":2016,"fp":"FY","form":"10-KT","filed":"2017-03-20","frame":"CY2015Q2I"},{"end":"2015-08-31","val":105795000,"accn":"0001436126-15-000026","fy":2016,"fp":"Q1","form":"10-Q","filed":"2015-10-13","frame":"CY2015Q3I"},{"end":"2015-11-30","val":101718000,"accn":"0001436126-16-000037","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-01-08","frame":"CY2015Q4I"},{"end":"2016-02-29","val":87366000,"accn":"0001436126-16-000049","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-04-07","frame":"CY2016Q1I"},{"end":"2016-05-31","val":85009000,"accn":"0001436126-16-000062","fy":2016,"fp":"FY","form":"10-K","filed":"2016-08-15"},{"end":"2016-05-31","val":85009000,"accn":"0001436126-16-000069","fy":2017,"fp":"Q1","form":"10-Q","filed":"2016-10-07"},{"end":"2016-05-31","val":85009000,"accn":"0001436126-17-000011","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-01-11"},{"end":"2016-05-31","val":85009000,"accn":"0001436126-17-000024","fy":2016,"fp":"FY","form":"10-KT","filed":"2017-03-20","frame":"CY2016Q2I"},{"end":"2016-08-31","val":70430000,"accn":"0001436126-16-000069","fy":2017,"fp":"Q1","form":"10-Q","filed":"2016-10-07","frame":"CY2016Q3I"},{"end":"2016-11-30","val":93360000,"accn":"0001436126-17-000011","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-01-11"},{"end":"2016-12-31","val":87296000,"accn":"0001436126-17-000024","fy":2016,"fp":"FY","form":"10-KT","filed":"2017-03-20"},{"end":"2016-12-31","val":87296000,"accn":"0001436126-17-000034","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-09"},{"end":"2016-12-31","val":87296000,"accn":"0001436126-17-000049","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-09"},{"end":"2016-12-31","val":87296000,"accn":"0001436126-17-000054","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":87296000,"accn":"0001436126-18-000017","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-14","frame":"CY2016Q4I"},{"end":"2017-03-31","val":97808000,"accn":"0001436126-17-000034","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-09","frame":"CY2017Q1I"},{"end":"2017-06-30","val":101660000,"accn":"0001436126-17-000049","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-09","frame":"CY2017Q2I"},{"end":"2017-09-30","val":104293000,"accn":"0001436126-17-000054","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":166878000,"accn":"0001436126-18-000017","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-14"},{"end":"2017-12-31","val":166878000,"accn":"0001436126-18-000027","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08"},{"end":"2017-12-31","val":166878000,"accn":"0001436126-18-000038","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-07"},{"end":"2017-12-31","val":166878000,"accn":"0001436126-18-000047","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-06"},{"end":"2017-12-31","val":166878000,"accn":"0001436126-19-000014","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-18","frame":"CY2017Q4I"},{"end":"2018-03-31","val":174461000,"accn":"0001436126-18-000027","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-08","frame":"CY2018Q1I"},{"end":"2018-06-30","val":152249000,"accn":"0001436126-18-000038","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-07","frame":"CY2018Q2I"},{"end":"2018-09-30","val":150151000,"accn":"0001436126-18-000047","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-06","frame":"CY2018Q3I"},{"end":"2018-12-31","val":290620000,"accn":"0001436126-19-000014","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-18"},{"end":"2018-12-31","val":290620000,"accn":"0001436126-19-000020","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-08"},{"end":"2018-12-31","val":290620000,"accn":"0001436126-19-000033","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-06"},{"end":"2018-12-31","val":290620000,"accn":"0001436126-19-000038","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-06"},{"end":"2018-12-31","val":290620000,"accn":"0001436126-20-000018","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-27","frame":"CY2018Q4I"},{"end":"2019-03-31","val":287706000,"accn":"0001436126-19-000020","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-08","frame":"CY2019Q1I"},{"end":"2019-06-30","val":270437000,"accn":"0001436126-19-000033","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-06","frame":"CY2019Q2I"},{"end":"2019-09-30","val":267316000,"accn":"0001436126-19-000038","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-06","frame":"CY2019Q3I"},{"end":"2019-12-31","val":254713000,"accn":"0001436126-20-000018","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-27"},{"end":"2019-12-31","val":254713000,"accn":"0001436126-20-000044","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-19"},{"end":"2019-12-31","val":254713000,"accn":"0001436126-20-000064","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-07"},{"end":"2019-12-31","val":254713000,"accn":"0001436126-20-000067","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-06"},{"end":"2019-12-31","val":254713000,"accn":"0001436126-21-000013","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-16","frame":"CY2019Q4I"},{"end":"2020-03-31","val":258026000,"accn":"0001436126-20-000044","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-19","frame":"CY2020Q1I"},{"end":"2020-06-30","val":239396000,"accn":"0001436126-20-000064","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-07","frame":"CY2020Q2I"},{"end":"2020-09-30","val":236506000,"accn":"0001436126-20-000067","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-06","frame":"CY2020Q3I"},{"end":"2020-12-31","val":220216000,"accn":"0001436126-21-000013","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-16"},{"end":"2020-12-31","val":220216000,"accn":"0001436126-21-000024","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-07"},{"end":"2020-12-31","val":220216000,"accn":"0001436126-21-000038","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-04"},{"end":"2020-12-31","val":220216000,"accn":"0001436126-21-000043","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-03"},{"end":"2020-12-31","val":220216000,"accn":"0001436126-22-000013","fy":2021,"fp":"FY","form":"10-K","filed":"2022-03-14","frame":"CY2020Q4I"},{"end":"2021-03-31","val":222306000,"accn":"0001436126-21-000024","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-07","frame":"CY2021Q1I"},{"end":"2021-06-30","val":211167000,"accn":"0001436126-21-000038","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-04","frame":"CY2021Q2I"},{"end":"2021-09-30","val":215854000,"accn":"0001436126-21-000043","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-03","frame":"CY2021Q3I"},{"end":"2021-12-31","val":202565000,"accn":"0001436126-22-000013","fy":2021,"fp":"FY","form":"10-K","filed":"2022-03-14"},{"end":"2021-12-31","val":202565000,"accn":"0001436126-22-000029","fy":2022,"fp":"Q1","form":"10-Q","filed":"2022-05-06"},{"end":"2021-12-31","val":202565000,"accn":"0001436126-22-000044","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-05"},{"end":"2021-12-31","val":202565000,"accn":"0001436126-22-000060","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-07"},{"end":"2021-12-31","val":202565000,"accn":"0001436126-23-000014","fy":2022,"fp":"FY","form":"10-K","filed":"2023-03-15"},{"end":"2021-12-31","val":202565000,"accn":"0001436126-23-000022","fy":2022,"fp":"FY","form":"10-K/A","filed":"2023-05-05","frame":"CY2021Q4I"},{"end":"2022-03-31","val":208814000,"accn":"0001436126-22-000029","fy":2022,"fp":"Q1","form":"10-Q","filed":"2022-05-06","frame":"CY2022Q1I"},{"end":"2022-06-30","val":200389000,"accn":"0001436126-22-000044","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-05","frame":"CY2022Q2I"},{"end":"2022-09-30","val":201212000,"accn":"0001436126-22-000060","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-07","frame":"CY2022Q3I"},{"end":"2022-12-31","val":191251000,"accn":"0001436126-23-000014","fy":2022,"fp":"FY","form":"10-K","filed":"2023-03-15"},{"end":"2022-12-31","val":191251000,"accn":"0001436126-23-000022","fy":2022,"fp":"FY","form":"10-K/A","filed":"2023-05-05"},{"end":"2022-12-31","val":191251000,"accn":"0001436126-23-000024","fy":2023,"fp":"Q1","form":"10-Q","filed":"2023-05-05"},{"end":"2022-12-31","val":191251000,"accn":"0001436126-23-000038","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-07"},{"end":"2022-12-31","val":191251000,"accn":"0001436126-23-000052","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-06"},{"end":"2022-12-31","val":191251000,"accn":"0001436126-24-000025","fy":2023,"fp":"FY","form":"10-K","filed":"2024-03-11","frame":"CY2022Q4I"},{"end":"2023-03-31","val":189344000,"accn":"0001436126-23-000024","fy":2023,"fp":"Q1","form":"10-Q","filed":"2023-05-05","frame":"CY2023Q1I"},{"end":"2023-06-30","val":183671000,"accn":"0001436126-23-000038","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-07","frame":"CY2023Q2I"},{"end":"2023-09-30","val":193868000,"accn":"0001436126-23-000052","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-06","frame":"CY2023Q3I"},{"end":"2023-12-31","val":190399000,"accn":"0001436126-24-000025","fy":2023,"fp":"FY","form":"10-K","filed":"2024-03-11"},{"end":"2023-12-31","val":190399000,"accn":"0001436126-24-000035","fy":2024,"fp":"Q1","form":"10-Q","filed":"2024-05-03"},{"end":"2023-12-31","val":190399000,"accn":"0001436126-24-000052","fy":2024,"fp":"Q2","form":"10-Q","filed":"2024-08-02"},{"end":"2023-12-31","val":190399000,"accn":"0001436126-24-000065","fy":2024,"fp":"Q3","form":"10-Q","filed":"2024-11-04"},{"end":"2023-12-31","val":190399000,"accn":"0001436126-25-000026","fy":2024,"fp":"FY","form":"10-K","filed":"2025-03-11","frame":"CY2023Q4I"},{"end":"2024-03-31","val":198426000,"accn":"0001436126-24-000035","fy":2024,"fp":"Q1","form":"10-Q","filed":"2024-05-03","frame":"CY2024Q1I"},{"end":"2024-06-30","val":199713000,"accn":"0001436126-24-000052","fy":2024,"fp":"Q2","form":"10-Q","filed":"2024-08-02","frame":"CY2024Q2I"},{"end":"2024-09-30","val":189700000,"accn":"0001436126-24-000065","fy":2024,"fp":"Q3","form":"10-Q","filed":"2024-11-04","frame":"CY2024Q3I"},{"end":"2024-12-31","val":169647000,"accn":"0001436126-25-000026","fy":2024,"fp":"FY","form":"10-K","filed":"2025-03-11"},{"end":"2024-12-31","val":169647000,"accn":"0001436126-25-000034","fy":2025,"fp":"Q1","form":"10-Q","filed":"2025-05-09"},{"end":"2024-12-31","val":169647000,"accn":"0001436126-25-000068","fy":2025,"fp":"Q2","form":"10-Q","filed":"2025-08-11"},{"end":"2024-12-31","val":169647000,"accn":"0001628280-25-050063","fy":2025,"fp":"Q3","form":"10-Q","filed":"2025-11-06"},{"end":"2024-12-31","val":169647000,"accn":"0001628280-26-016765","fy":2025,"fp":"FY","form":"10-K","filed":"2026-03-11","frame":"CY2024Q4I"},{"end":"2025-03-31","val":171874000,"accn":"0001436126-25-000034","fy":2025,"fp":"Q1","form":"10-Q","filed":"2025-05-09","frame":"CY2025Q1I"},{"end":"2025-06-30","val":189414000,"accn":"0001436126-25-000068","fy":2025,"fp":"Q2","form":"10-Q","filed":"2025-08-11","frame":"CY2025Q2I"},{"end":"2025-09-30","val":202270000,"accn":"0001628280-25-050063","fy":2025,"fp":"Q3","form":"10-Q","filed":"2025-11-06","frame":"CY2025Q3I"},{"end":"2025-12-31","val":177992000,"accn":"0001628280-26-016765","fy":2025,"fp":"FY","form":"10-K","filed":"2026-03-11"},{"end":"2025-12-31","val":177992000,"accn":"0001628280-26-031968","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-07"},{"end":"2025-12-31","val":177992000,"accn":"0001628280-26-055351","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-10","frame":"CY2025Q4I"},{"end":"2026-03-31","val":181353000,"accn":"0001628280-26-031968","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-07","frame":"CY2026Q1I"},{"end":"2026-06-30","val":172093000,"accn":"0001628280-26-055351","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-10","frame":"CY2026Q2I"}]}}