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RETIREMENT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Pension Plan |  |  |  |
Net periodic benefit cost: |  |  |  |
Interest cost | $ 102 | $ 73 | $ 305 | $ 218
Expected return on plan assets | (167) | (156) | (500) | (467)
Amortization of net actuarial gain | 0 | 0 | 0 | 0
Net periodic benefit (income) cost | (65) | (83) | (195) | (249)
Other disclosures |  |  |  |
Estimated future Pension Plan contributions | 0 |  | 0 |
SERP |  |  |  |
Net periodic benefit cost: |  |  |  |
Interest cost | 22 | 15 | 66 | 45
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of net actuarial gain | (20) | 0 | (60) | 0
Net periodic benefit (income) cost | $ 2 | $ 15 | $ 6 | $ 45

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