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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, 2020 | Sep. 30, 2019 | Jun. 30, 2020
Assumptions: |  |  |
Net pension expense | $ 1,505 | $ 1,436 |
Interest cost, location | us-gaap:NonoperatingIncomeExpense |  |
Amortization of actuarial (gains) losses, location | us-gaap:NonoperatingIncomeExpense |  |
Pension Plan |  |  |
Assumptions: |  |  |
Service cost | $ 598 | 520 | $ 2,138
Interest cost | 306 | 283 | 1,164
Amortization of actuarial (gains) and losses | 201 | 224 |
Net pension expense | 1,105 | 1,027 |
Pension Plan | CDT |  |  |
Assumptions: |  |  |
Service cost | 116 | 142 | 572
Interest cost | 124 | 114 | 459
Amortization of actuarial (gains) and losses | 173 | 234 |
Net pension expense | 413 | 490 |
Pension Plan | GXS GER |  |  |
Assumptions: |  |  |
Service cost | 51 | 79 | 319
Interest cost | 89 | 84 | 337
Amortization of actuarial (gains) and losses | 28 | 61 |
Net pension expense | 168 | 224 |
Pension Plan | GXS PHP |  |  |
Assumptions: |  |  |
Service cost | 431 | 299 | 1,247
Interest cost | 93 | 85 | $ 368
Amortization of actuarial (gains) and losses | 0 | (71) |
Net pension expense | $ 524 | $ 313 |

X
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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