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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, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2018
Assumptions:          
Net pension expense     $ 3,412 $ 2,834  
Pension Plan          
Assumptions:          
Service cost $ 462 $ 463 1,359 1,393 $ 1,805
Interest cost 357 347 1,068 1,005 1,337
Amortization of actuarial (gains) and losses 63 101 201 282  
Net pension expense 882 911 2,628 2,680  
Pension Plan | CDT defined benefit plan          
Assumptions:          
Service cost 136 130 413 379 501
Interest cost 159 158 483 459 607
Amortization of actuarial (gains) and losses 173 141 524 409  
Net pension expense 468 429 1,420 1,247  
Pension Plan | GXS GER defined benefit plan          
Assumptions:          
Service cost 141 123 426 357 472
Interest cost 121 127 368 370 489
Amortization of actuarial (gains) and losses 32 19 98 55  
Net pension expense 294 269 892 782  
Pension Plan | GXS PHP defined benefit plan          
Assumptions:          
Service cost 185 210 520 657 832
Interest cost 77 62 217 176 $ 241
Amortization of actuarial (gains) and losses (142) (59) (421) (182)  
Net pension expense $ 120 $ 213 $ 316 $ 651