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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, 2021
Jun. 30, 2020
Jun. 30, 2019
Assumptions:      
Net pension expense $ 6,616 $ 5,802 $ 4,624
Pension Plan      
Assumptions:      
Service cost 2,501 2,138 1,887
Interest cost 1,338 1,164 1,431
Amortization of actuarial (gains) and losses 817 895 264
Net pension expense 4,656 4,197 3,582
Pension Plan | CDT      
Assumptions:      
Service cost 473 572 550
Interest cost 505 459 642
Amortization of actuarial (gains) and losses 705 939 696
Net pension expense 1,683 1,970 1,888
Pension Plan | GXS GER      
Assumptions:      
Service cost 206 319 566
Interest cost 364 337 489
Amortization of actuarial (gains) and losses 113 244 130
Net pension expense 683 900 1,185
Pension Plan | GXS PHP      
Assumptions:      
Service cost 1,822 1,247 771
Interest cost 469 368 300
Amortization of actuarial (gains) and losses (1) (288) (562)
Net pension expense $ 2,290 $ 1,327 $ 509