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RETIREMENT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Pension Plan |  |  |  |
Net periodic benefit cost: |  |  |  |
Interest cost | $ 102 | $ 101 | $ 205 | $ 203
Expected return on plan assets | (191) | (166) | (383) | (333)
Amortization of net actuarial gain | 0 | 0 | 0 | 0
Net periodic benefit (income) cost | (89) | (65) | (178) | (130)
Other disclosures |  |  |  |
Estimated future Pension Plan contributions | 0 |  | 0 |
SERP |  |  |  |
Net periodic benefit cost: |  |  |  |
Interest cost | 24 | 22 | 48 | 44
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of net actuarial gain | (22) | (20) | (43) | (40)
Net periodic benefit (income) cost | $ 2 | $ 2 | $ 5 | $ 4

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