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RETIREMENT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2021 | Jun. 30, 2020
Other disclosures |  |  |  |  |
Net actuarial gains arising during the period | $ 0 | $ 0 |  | $ 0 | $ 880
Reduction in unrecognized benefit costs previously included in AOCI | (26) | (20) |  | (92) | (100)
Curtailment gain and gain on termination of post-retirement medical plan in OCI | 541 |  |  | 541 | 1,699
Gain on termination of post-retirement medical plan | 2,341 | 0 |  | 2,341 | 0
Pension Plan |  |  |  |  |
Net periodic benefit cost: |  |  |  |  |
Service cost |  |  |  | 0 | 50
Interest cost | 64 | 73 |  | 193 | 228
Expected return on plan assets | (136) | (173) |  | (410) | (508)
Amortization of prior service cost (credit) |  |  |  | 0 | 1
Amortization of net actuarial loss | 10 | 0 |  | 30 | 35
Curtailment cost (income) |  |  |  | 0 | 53
Net periodic benefit (income) cost | (62) | (100) |  | (187) | (141)
Other disclosures |  |  |  |  |
Estimated future Pension Plan contributions | 0 |  |  | 0 |
SERP |  |  |  |  |
Net periodic benefit cost: |  |  |  |  |
Service cost |  |  |  | 0 | 3
Interest cost | 13 | 16 |  | 39 | 49
Amortization of prior service cost (credit) |  |  |  | 0 | (1)
Amortization of net actuarial loss | 0 | 0 |  | 0 | 5
Curtailment cost (income) |  |  |  | 0 | (53)
Net periodic benefit (income) cost | 13 | 16 |  | 39 | 3
Post-retirement Medical |  |  |  |  |
Net periodic benefit cost: |  |  |  |  |
Service cost |  |  |  | 0 | 0
Interest cost | 12 | 20 |  | 48 | 60
Amortization of prior service cost (credit) |  |  |  | 0 | 0
Amortization of net actuarial loss | 16 | 20 |  | 62 | 60
Curtailment cost (income) |  |  |  | 0 | 0
Net periodic benefit (income) cost | 28 | 40 |  | 110 | 120
Other disclosures |  |  |  |  |
Curtailment gain and gain on termination of post-retirement medical plan in OCI | 541 | 0 |  | 541 | 0
Gain on termination of post-retirement medical plan | 2,341 |  |  | 2,341 |
Pension Plan And SERP |  |  |  |  |
Other disclosures |  |  |  |  |
Net actuarial gains arising during the period |  |  | $ 880 |  |
Reduction in unrecognized benefit costs previously included in AOCI |  |  | 1,699 |  |
Curtailment gain and gain on termination of post-retirement medical plan in OCI | $ 0 | $ 0 | $ 1,699 | $ 0 | $ 1,699

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