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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, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2020
Assumptions:          
Net pension expense     $ 4,670 $ 4,323  
Pension Plan          
Assumptions:          
Service cost $ 572 $ 523 1,754 1,577 $ 2,138
Interest cost 319 286 949 856 1,164
Amortization of actuarial (gains) and losses 203 223 614 671  
Net pension expense 1,094 1,032 3,317 3,104  
Pension Plan | CDT          
Assumptions:          
Service cost 117 140 354 426 572
Interest cost 125 112 378 341 459
Amortization of actuarial (gains) and losses 175 234 529 703  
Net pension expense 417 486 1,261 1,470  
Pension Plan | GXS GER          
Assumptions:          
Service cost 51 78 155 237 319
Interest cost 90 82 272 250 337
Amortization of actuarial (gains) and losses 28 61 85 183  
Net pension expense 169 221 512 670  
Pension Plan | GXS PHP          
Assumptions:          
Service cost 404 305 1,245 914 1,247
Interest cost 104 92 299 265 $ 368
Amortization of actuarial (gains) and losses 0 (72) 0 (215)  
Net pension expense $ 508 $ 325 $ 1,544 $ 964