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PENSION PLANS AND OTHER POST RETIREMENT BENEFITS - Components of Net Pension Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Assumptions:      
Net pension expense $ 1,486 $ 1,505  
Pension Plan      
Assumptions:      
Service cost 565 598 $ 2,501
Interest cost 325 306 1,338
Amortization of actuarial (gains) and losses 108 201  
Net pension expense 998 1,105  
Pension Plan | CDT      
Assumptions:      
Service cost 94 116 473
Interest cost 112 124 505
Amortization of actuarial (gains) and losses 125 173  
Net pension expense 331 413  
Pension Plan | GXS GER      
Assumptions:      
Service cost 43 51 206
Interest cost 80 89 364
Amortization of actuarial (gains) and losses 6 28  
Net pension expense 129 168  
Pension Plan | GXS PHP      
Assumptions:      
Service cost 428 431 1,822
Interest cost 133 93 $ 469
Amortization of actuarial (gains) and losses (23) 0  
Net pension expense $ 538 $ 524