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Pension Plans and Other Post Retirement Benefits - Components of Net Pension Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Jun. 30, 2017
Assumptions:          
Net pension expense     $ 2,834 $ 2,953  
Pension Plan          
Assumptions:          
Service cost $ 463 $ 408 1,393 1,477 $ 1,913
Interest cost 347 257 1,005 790 1,059
Amortization of actuarial (gains) and losses 101 185 282 554  
Net pension expense 911 850 2,680 2,821  
Pension Plan | CDT          
Assumptions:          
Service cost 130 115 379 347 467
Interest cost 158 113 459 339 456
Amortization of actuarial (gains) and losses 141 155 409 465  
Net pension expense 429 383 1,247 1,151  
Pension Plan | GXS Germany          
Assumptions:          
Service cost 123 97 357 292 395
Interest cost 127 93 370 279 377
Amortization of actuarial (gains) and losses 19 42 55 125  
Net pension expense 269 232 782 696  
Pension Plan | GXS Philippines          
Assumptions:          
Service cost 210 196 657 838 1,051
Interest cost 62 51 176 172 $ 226
Amortization of actuarial (gains) and losses (59) (12) (182) (36)  
Net pension expense $ 213 $ 235 $ 651 $ 974