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RETIREMENT PLANS (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 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) |  | (16) | (80) | (33)
Pension Plan |  |  |  |  |  |
Net periodic benefit cost: |  |  |  |  |  |
Service cost |  | 0 |  | 50 | 50 | 100
Interest cost |  | 72 |  | 94 | 155 | 187
Expected return on plan assets |  | (172) |  | (160) | (335) | (321)
Amortization of prior service cost (credit) |  | 0 |  | 2 | 1 | 3
Amortization of net actuarial loss |  | 0 |  | 1 | 35 | 4
Curtailment cost (income) |  |  |  |  | 53 | 0
Net periodic benefit (income) cost |  | (100) |  | (13) | (41) | (27)
Other disclosures |  |  |  |  |  |
Estimated future Pension Plan contributions |  | 0 |  |  | 0 |
SERP |  |  |  |  |  |
Net periodic benefit cost: |  |  |  |  |  |
Service cost |  | 0 |  | 9 | 3 | 18
Interest cost |  | 15 |  | 21 | 33 | 42
Amortization of prior service cost (credit) |  | 0 |  | (1) | (1) | (2)
Amortization of net actuarial loss |  | 0 |  | 1 | 5 | 2
Curtailment cost (income) |  |  |  |  | (53) | 0
Net periodic benefit (income) cost |  | 15 |  | 30 | (13) | 60
Postretirement Medical |  |  |  |  |  |
Net periodic benefit cost: |  |  |  |  |  |
Service cost |  | 0 |  | 0 | 0 | 0
Interest cost |  | 20 |  | 25 | 40 | 50
Amortization of prior service cost (credit) |  | 0 |  | 0 | 0 | 0
Amortization of net actuarial loss |  | 20 |  | 13 | 40 | 26
Curtailment cost (income) |  |  |  |  | 0 | 0
Net periodic benefit (income) cost |  | $ 40 |  | $ 38 | $ 80 | $ 76
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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