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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, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Jun. 30, 2021
Assumptions:          
Net pension expense     $ 4,883 $ 4,670  
Pension Plan          
Assumptions:          
Service cost $ 649 $ 572 1,819 1,754 $ 2,501
Interest cost 344 319 1,015 949 1,338
Amortization of actuarial (gains) losses 101 203 313 614  
Net pension expense 1,094 1,094 3,147 3,317  
Pension Plan | CDT          
Assumptions:          
Service cost 88 117 273 354 473
Interest cost 105 125 326 378 505
Amortization of actuarial (gains) losses 117 175 363 529  
Net pension expense 310 417 962 1,261  
Pension Plan | GXS GER          
Assumptions:          
Service cost 41 51 126 155 206
Interest cost 75 90 232 272 364
Amortization of actuarial (gains) losses 6 28 18 85  
Net pension expense 122 169 376 512  
Pension Plan | GXS PHP          
Assumptions:          
Service cost 520 404 1,420 1,245 1,822
Interest cost 164 104 457 299 $ 469
Amortization of actuarial (gains) losses (22) 0 (68) 0  
Net pension expense $ 662 $ 508 $ 1,809 $ 1,544