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Pension Plans and Other Post Retirement Benefits - Components of Net Pension Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Assumptions:      
Net pension expense $ 4,624 $ 3,738 $ 3,893
Pension Plan      
Assumptions:      
Service cost 1,887 1,805  
Interest cost 1,431 1,337  
Amortization of actuarial (gains) and losses 264 372  
Net pension expense 3,582 3,514  
Pension Plan | CDT defined benefit plan      
Assumptions:      
Service cost 550 501  
Interest cost 642 607  
Amortization of actuarial (gains) and losses 696 541  
Net pension expense 1,888 1,649  
Pension Plan | GXS GER defined benefit plan      
Assumptions:      
Service cost 566 472  
Interest cost 489 489  
Amortization of actuarial (gains) and losses 130 72  
Net pension expense 1,185 1,033  
Pension Plan | GXS PHP defined benefit plan      
Assumptions:      
Service cost 771 832  
Interest cost 300 241  
Amortization of actuarial (gains) and losses (562) (241)  
Net pension expense $ 509 $ 832