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RETIREMENT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Other disclosures |  |  |  |
Gain on termination of post-retirement medical plan | $ 0 | $ 2,341 | $ 0 | $ 2,341
Pension Plan |  |  |  |
Net periodic benefit cost: |  |  |  |
Interest cost | 73 | 64 | 218 | 193
Expected return on plan assets | (156) | (136) | (467) | (410)
Amortization of net actuarial loss | 0 | 10 | 0 | 30
Net periodic benefit (income) cost | (83) | (62) | (249) | (187)
Other disclosures |  |  |  |
Estimated future Pension Plan contributions | 0 |  | 0 |
SERP |  |  |  |
Net periodic benefit cost: |  |  |  |
Interest cost | 15 | 13 | 45 | 39
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of net actuarial loss | 0 | 0 | 0 | 0
Net periodic benefit (income) cost | 15 | 13 | 45 | 39
Post-retirement Medical |  |  |  |
Net periodic benefit cost: |  |  |  |
Interest cost | 0 | 12 | 0 | 48
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of net actuarial loss | 0 | 16 | 0 | 62
Net periodic benefit (income) cost | $ 0 | 28 | 0 | 110
Other disclosures |  |  |  |
Gain on termination of post-retirement medical plan |  | $ 2,341 | $ 0 | $ 2,341

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