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RETIREMENT PLANS (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2021 | Mar. 31, 2020
Other disclosures |  |  |  |  |  |
Net actuarial gains arising during the period |  | $ 0 | $ 0 |  | $ 0 | $ 880
Reduction in unrecognized benefit costs previously included in AOCI |  | (33) | (20) |  | (66) | (80)
Curtailment gain |  | 0 | 0 |  | 0 | 1,699
Pension Plan |  |  |  |  |  |
Net periodic benefit cost: |  |  |  |  |  |
Service cost |  |  |  |  | 0 | 50
Interest cost |  | 64 | 72 |  | 129 | 155
Expected return on plan assets |  | (137) | (172) |  | (274) | (335)
Amortization of prior service cost (credit) |  |  |  |  | 0 | 1
Amortization of net actuarial loss |  | 10 | 0 |  | 20 | 35
Curtailment cost (income) |  |  |  |  | 0 | 53
Net periodic benefit (income) cost |  | (63) | (100) |  | (125) | (41)
Other disclosures |  |  |  |  |  |
Estimated future Pension Plan contributions |  | 0 |  |  | 0 |
SERP |  |  |  |  |  |
Net periodic benefit cost: |  |  |  |  |  |
Service cost |  |  |  |  | 0 | 3
Interest cost |  | 13 | 15 |  | 26 | 33
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 | 15 |  | 26 | (13)
Postretirement Medical |  |  |  |  |  |
Net periodic benefit cost: |  |  |  |  |  |
Service cost |  |  |  |  | 0 | 0
Interest cost |  | 18 | 20 |  | 36 | 40
Amortization of prior service cost (credit) |  |  |  |  | 0 | 0
Amortization of net actuarial loss |  | 23 | 20 |  | 46 | 40
Curtailment cost (income) |  |  |  |  | 0 | 0
Net periodic benefit (income) cost |  | $ 41 | $ 40 |  | $ 82 | $ 80
Postretirement Medical | Subsequent Event |  |  |  |  |  |
Other disclosures |  |  |  |  |  |
Curtailment gain | $ 2,000 |  |  |  |  |
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 |  |  |  | $ 1,699 |  |

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- Definition Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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