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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 |

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