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Pension Plans and Other Post Retirement Benefits - Schedule of Defined Benefit Plans and Long-Term Employee Benefit Obligations (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Assumptions:    
Total benefit obligation $ 67,473 $ 67,981
Current portion of benefit obligation 2,208 2,262
Non-current portion of benefit obligation 65,265 65,719
Pension Plan | CDT defined benefit plan    
Assumptions:    
Total benefit obligation 32,326 32,651
Current portion of benefit obligation 661 655
Non-current portion of benefit obligation 31,665 31,996
Pension Plan | GXS GER defined benefit plan    
Assumptions:    
Total benefit obligation 25,285 25,382
Current portion of benefit obligation 1,003 1,027
Non-current portion of benefit obligation 24,282 24,355
Pension Plan | GXS PHP defined benefit plan    
Assumptions:    
Total benefit obligation 4,067 3,853
Current portion of benefit obligation 117 138
Non-current portion of benefit obligation 3,950 3,715
Other plans    
Assumptions:    
Total benefit obligation 5,795 6,095
Current portion of benefit obligation 427 442
Non-current portion of benefit obligation $ 5,368 $ 5,653