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RETIREMENT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Pension Plan |  |  |  |
Net periodic benefit cost: |  |  |  |
Interest cost | $ 103 | $ 102 | $ 308 | $ 305
Expected return on plan assets | (192) | (167) | (575) | (500)
Amortization of net actuarial gain | 0 | 0 | 0 | 0
Net periodic benefit (income) cost | (89) | (65) | (267) | (195)
Other disclosures |  |  |  |
Estimated future Pension Plan contributions | 0 |  | 0 |
SERP |  |  |  |
Net periodic benefit cost: |  |  |  |
Interest cost | 24 | 22 | 72 | 66
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of net actuarial gain | (21) | (20) | (64) | (60)
Net periodic benefit (income) cost | $ 3 | $ 2 | $ 8 | $ 6

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