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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, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2019
Assumptions:          
Net pension expense     $ 4,323 $ 3,412  
Pension Plan          
Assumptions:          
Service cost $ 523 $ 462 1,577 1,359 $ 1,887
Interest cost 286 357 856 1,068 1,431
Amortization of actuarial (gains) and losses 223 63 671 201  
Net pension expense 1,032 882 3,104 2,628  
Pension Plan | CDT defined benefit plan          
Assumptions:          
Service cost 140 136 426 413 550
Interest cost 112 159 341 483 642
Amortization of actuarial (gains) and losses 234 173 703 524  
Net pension expense 486 468 1,470 1,420  
Pension Plan | GXS GER defined benefit plan          
Assumptions:          
Service cost 78 141 237 426 566
Interest cost 82 121 250 368 489
Amortization of actuarial (gains) and losses 61 32 183 98  
Net pension expense 221 294 670 892  
Pension Plan | GXS PHP defined benefit plan          
Assumptions:          
Service cost 305 185 914 520 771
Interest cost 92 77 265 217 $ 300
Amortization of actuarial (gains) and losses (72) (142) (215) (421)  
Net pension expense $ 325 $ 120 $ 964 $ 316