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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
Sep. 30, 2018
Jun. 30, 2018
Assumptions:    
Total benefit obligation $ 67,003 $ 67,981
Current portion of benefit obligation 2,273 2,262
Non-current portion of benefit obligation 64,730 65,719
Pension Plan | CDT defined benefit plan    
Assumptions:    
Total benefit obligation 32,668 32,651
Current portion of benefit obligation 673 655
Non-current portion of benefit obligation 31,995 31,996
Pension Plan | GXS GER defined benefit plan    
Assumptions:    
Total benefit obligation 25,206 25,382
Current portion of benefit obligation 1,039 1,027
Non-current portion of benefit obligation 24,167 24,355
Pension Plan | GXS PHP defined benefit plan    
Assumptions:    
Total benefit obligation 3,431 3,853
Current portion of benefit obligation 138 138
Non-current portion of benefit obligation 3,293 3,715
Other plans    
Assumptions:    
Total benefit obligation 5,698 6,095
Current portion of benefit obligation 423 442
Non-current portion of benefit obligation $ 5,275 $ 5,653