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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, 2017
Jun. 30, 2016
Jun. 30, 2015
Assumptions:      
Service cost $ 1,913 $ 2,409  
Interest cost 1,059 1,467  
Net pension expense 3,893 4,577 $ 4,796
Pension Plan      
Assumptions:      
Service cost 1,913 2,409 2,330
Interest cost 1,059 1,467 1,649
Amortization of actuarial (gains) and losses 747 448 403
Net pension expense 3,719 4,324 4,382
Pension Plan | CDT      
Assumptions:      
Service cost 467 422 452
Interest cost 456 610 735
Amortization of actuarial (gains) and losses 627 425 403
Net pension expense 1,550 1,457 1,590
Pension Plan | GXS Germany      
Assumptions:      
Service cost 395 359 360
Interest cost 377 543 625
Amortization of actuarial (gains) and losses 168 23 0
Net pension expense 940 925 985
Pension Plan | GXS Philippines      
Assumptions:      
Service cost 1,051 1,628 1,518
Interest cost 226 314 289
Amortization of actuarial (gains) and losses (48) 0 0
Net pension expense $ 1,229 $ 1,942 $ 1,807