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RETIREMENT PLANS (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Retirement plans |  |  |  |  |  |
Curtailment gain, net of taxes of $0 |  | $ 0 |  | $ 0 | $ 1,699 | $ 0
Other disclosures |  |  |  |  |  |
Net actuarial gains arising during the period |  | 0 |  | 0 | 880 | 0
Reduction in unrecognized benefit costs previously included in AOCI |  | (20) |  | (9) | (100) | (42)
Pension Plan |  |  |  |  |  |
Net periodic benefit cost: |  |  |  |  |  |
Service cost |  | 0 |  | 41 | 50 | 141
Interest cost |  | 73 |  | 92 | 228 | 279
Expected return on plan assets |  | (173) |  | (165) | (508) | (486)
Amortization of prior service cost (credit) |  | 0 |  | 2 | 1 | 5
Amortization of net actuarial loss |  | 0 |  | (3) | 35 | 1
Curtailment cost (income) |  |  |  |  | 53 | 0
Net periodic benefit (income) cost |  | (100) |  | (33) | (141) | (60)
Other disclosures |  |  |  |  |  |
Estimated future Pension Plan contributions |  | 0 |  |  | 0 |
SERP |  |  |  |  |  |
Net periodic benefit cost: |  |  |  |  |  |
Service cost |  | 0 |  | 6 | 3 | 24
Interest cost |  | 16 |  | 16 | 49 | 58
Amortization of prior service cost (credit) |  | 0 |  | (2) | (1) | (4)
Amortization of net actuarial loss |  | 0 |  | (1) | 5 | 1
Curtailment cost (income) |  |  |  |  | (53) | 0
Net periodic benefit (income) cost |  | 16 |  | 19 | 3 | 79
Postretirement Medical |  |  |  |  |  |
Net periodic benefit cost: |  |  |  |  |  |
Service cost |  | 0 |  | 0 | 0 | 0
Interest cost |  | 20 |  | 25 | 60 | 75
Amortization of prior service cost (credit) |  | 0 |  | 0 | 0 | 0
Amortization of net actuarial loss |  | 20 |  | 13 | 60 | 39
Curtailment cost (income) |  |  |  |  | 0 | 0
Net periodic benefit (income) cost |  | $ 40 |  | $ 38 | $ 120 | $ 114
Pension Plan And SERP |  |  |  |  |  |
Retirement plans |  |  |  |  |  |
Curtailment gain, net of taxes of $0 | $ 1,699 |  |  |  |  |
Other disclosures |  |  |  |  |  |
Net actuarial gains arising during the period |  |  | $ 880 |  |  |
Reduction in unrecognized benefit costs previously included in AOCI | $ 1,699 |  |  |  |  |

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