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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, 2018
Jun. 30, 2017
Jun. 30, 2016
Assumptions:      
Net pension expense $ 3,738 $ 3,893 $ 4,577
Pension Plan      
Assumptions:      
Service cost 1,805 1,913 2,409
Interest cost 1,337 1,059 1,467
Amortization of actuarial (gains) and losses 372 747 448
Net pension expense 3,514 3,719 4,324
Pension Plan | CDT defined benefit plan      
Assumptions:      
Service cost 501 467 422
Interest cost 607 456 610
Amortization of actuarial (gains) and losses 541 627 425
Net pension expense 1,649 1,550 1,457
Pension Plan | GXS GER defined benefit plan      
Assumptions:      
Service cost 472 395 359
Interest cost 489 377 543
Amortization of actuarial (gains) and losses 72 168 23
Net pension expense 1,033 940 925
Pension Plan | GXS PHP defined benefit plan      
Assumptions:      
Service cost 832 1,051 1,628
Interest cost 241 226 314
Amortization of actuarial (gains) and losses (241) (48) 0
Net pension expense $ 832 $ 1,229 $ 1,942