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RETIREMENT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Change in Plan Assets: |  |  |  |
Fair value of plan assets at beginning of year | $ 10,192 |  | $ 10,192 |
Fair value of plan assets at end of year |  | $ 11,051 | 11,051 | $ 10,192
Amounts recognized in the Consolidated Balance Sheets: |  |  |  |
Noncurrent assets |  | 771 | 771 | 0
Noncurrent liabilities |  | (4,829) | (4,829) | (5,785)
Other disclosures |  |  |  |
Curtailment gain, net of taxes of $0 |  |  | 1,726 | 0
Net periodic benefit cost for the year: |  |  |  |
Expected return on plan assets |  |  |  |
Curtailment cost (income) |  |  |  |
Pension Plan |  |  |  |
Retirement plans |  |  |  |
Period of employee's highest average earnings on which benefits are based |  |  | 5 years |
Change in Projected Benefit Obligation: |  |  |  |
Benefit obligation at beginning of year | 10,971 |  | $ 10,971 | 9,164
Service cost |  |  | 50 | 189
Interest cost |  |  | 304 | 372
Actuarial loss (gain) |  |  | 504 | 1,426
Benefits paid |  |  | (153) | (180)
Curtailments |  |  | (1,396) | 0
Benefit obligation at end of year |  | 10,280 | 10,280 | 10,971
Change in Plan Assets: |  |  |  |
Fair value of plan assets at beginning of year | $ 10,192 |  | 10,192 | 10,012
Actual return on plan assets |  |  | 1,012 | 245
Employer contributions |  |  | 0 | 115
Benefits paid |  |  | (153) | (180)
Fair value of plan assets at end of year |  | 11,051 | 11,051 | 10,192
Funded status |  | 771 | 771 | (779)
Amounts recognized in the Consolidated Balance Sheets: |  |  |  |
Noncurrent assets |  | 771 | 771 | 0
Noncurrent liabilities |  | 0 | 0 | (779)
Net amount |  | 771 | 771 | (779)
Amounts recognized in accumulated other comprehensive loss (income) before income taxes: |  |  |  |
Net actuarial loss |  | 1,681 | 1,681 | 2,939
Prior service cost (credit) |  | 0 | 0 | 54
Accumulated other comprehensive loss |  | 1,681 | 1,681 | $ 2,993
Other disclosures |  |  |  |
Expected contributions |  | $ 0 | $ 0 |
Assumptions used to determine fiscal year-end benefit obligations: |  |  |  |
Discount rate |  | 2.54% | 2.54% | 3.06%
Rate of compensation increase |  |  |  | 4.00%
Assumptions used to determine net benefit costs (years ended): |  |  |  |
Discount rate | 3.06% | 3.15% |  | 4.15%
Expected return on plan assets |  |  | 6.50% | 6.50%
Rate of compensation increase |  |  | 4.00% | 4.00%
Net periodic benefit cost for the year: |  |  |  |
Service cost |  |  | $ 50 | $ 189
Interest cost |  |  | 304 | 372
Expected return on plan assets |  |  | (680) | (648)
Amortization of prior service cost (credit) |  |  | 1 | 6
Amortization of net actuarial loss |  |  | 35 | 2
Curtailment cost (income) |  |  | 53 | 0
Net periodic benefit (income) cost |  |  | (237) | (79)
Amounts that are estimated to be amortized from accumulated other comprehensive loss into net periodic benefit cost in the next fiscal year |  |  |  |
Prior service cost (credit) |  | $ 0 | 0 |
Net actuarial loss (gain) |  | 39 | 39 |
Total amount |  | 39 | 39 |
Accumulated benefit obligation |  | 10,280 | 10,280 | 9,600
Expected Benefit Payments: |  |  |  |
Fiscal year ending September 30, 2021 |  | 272 | 272 |
Fiscal year ending September 30, 2022 |  | 391 | 391 |
Fiscal year ending September 30, 2023 |  | 455 | 455 |
Fiscal year ending September 30, 2024 |  | 517 | 517 |
Fiscal year ending September 30, 2025 |  | 508 | 508 |
Fiscal years ending September 30, 2026 through 2030 |  | 2,653 | 2,653 |
SERP |  |  |  |
Change in Projected Benefit Obligation: |  |  |  |
Benefit obligation at beginning of year | $ 2,385 |  | 2,385 | 2,039
Service cost |  |  | 3 | 32
Interest cost |  |  | 63 | 78
Actuarial loss (gain) |  |  | (90) | 236
Benefits paid |  |  | 0 | 0
Curtailments |  |  | (330) | 0
Benefit obligation at end of year |  | 2,031 | 2,031 | 2,385
Change in Plan Assets: |  |  |  |
Employer contributions |  |  | 0 | 0
Benefits paid |  |  | 0 | 0
Funded status |  | (2,031) | (2,031) | (2,385)
Amounts recognized in the Consolidated Balance Sheets: |  |  |  |
Current liabilities |  | (32) | (32) | (2)
Noncurrent liabilities |  | (1,999) | (1,999) | (2,383)
Net amount |  | (2,031) | (2,031) | (2,385)
Amounts recognized in accumulated other comprehensive loss (income) before income taxes: |  |  |  |
Net actuarial loss |  | 72 | 72 | 497
Prior service cost (credit) |  | 0 | 0 | (54)
Accumulated other comprehensive loss |  | $ 72 | $ 72 | $ 443
Assumptions used to determine fiscal year-end benefit obligations: |  |  |  |
Discount rate |  | 2.54% | 2.54% | 3.06%
Rate of compensation increase |  |  |  | 4.00%
Assumptions used to determine net benefit costs (years ended): |  |  |  |
Discount rate | 3.06% | 3.15% |  | 4.15%
Rate of compensation increase |  |  | 4.00% | 4.00%
Net periodic benefit cost for the year: |  |  |  |
Service cost |  |  | $ 3 | $ 32
Interest cost |  |  | 63 | 78
Expected return on plan assets |  |  | 0 | 0
Amortization of prior service cost (credit) |  |  | (1) | (6)
Amortization of net actuarial loss |  |  | 5 | 0
Curtailment cost (income) |  |  | (53) | 0
Net periodic benefit (income) cost |  |  | 17 | 104
Amounts that are estimated to be amortized from accumulated other comprehensive loss into net periodic benefit cost in the next fiscal year |  |  |  |
Prior service cost (credit) |  | $ 0 | 0 |
Net actuarial loss (gain) |  | 0 | 0 |
Total amount |  | 0 | 0 |
Accumulated benefit obligation |  | 2,031 | 2,031 | 2,032
Expected Benefit Payments: |  |  |  |
Fiscal year ending September 30, 2021 |  | 32 | 32 |
Fiscal year ending September 30, 2022 |  | 63 | 63 |
Fiscal year ending September 30, 2023 |  | 90 | 90 |
Fiscal year ending September 30, 2024 |  | 117 | 117 |
Fiscal year ending September 30, 2025 |  | 116 | 116 |
Fiscal years ending September 30, 2026 through 2030 |  | 590 | $ 590 |
Postretirement Medical |  |  |  |
Retirement plans |  |  |  |
Minimum period of service to be attained for being covered under the plan |  |  | 20 years |
Minimum period of service to be attained at the position of Vice President or higher for being covered under the plan |  |  | 10 years |
Change in Projected Benefit Obligation: |  |  |  |
Benefit obligation at beginning of year | $ 2,633 |  | $ 2,633 | 2,382
Service cost |  |  | 0 | 0
Interest cost |  |  | 80 | 99
Actuarial loss (gain) |  |  | 134 | 161
Benefits paid |  |  | (8) | (9)
Benefit obligation at end of year |  | 2,839 | 2,839 | 2,633
Change in Plan Assets: |  |  |  |
Employer contributions |  |  | 8 | 9
Benefits paid |  |  | (8) | (9)
Funded status |  | (2,839) | (2,839) | (2,633)
Amounts recognized in the Consolidated Balance Sheets: |  |  |  |
Current liabilities |  | (9) | (9) | (10)
Noncurrent liabilities |  | (2,830) | (2,830) | (2,623)
Net amount |  | (2,839) | (2,839) | (2,633)
Amounts recognized in accumulated other comprehensive loss (income) before income taxes: |  |  |  |
Net actuarial loss |  | 721 | 721 | 667
Prior service cost (credit) |  | 0 | 0 | 0
Accumulated other comprehensive loss |  | $ 721 | $ 721 | $ 667
Assumptions used to determine fiscal year-end benefit obligations: |  |  |  |
Discount rate |  | 2.54% | 2.54% | 3.06%
Assumptions used to determine net benefit costs (years ended): |  |  |  |
Discount rate |  |  | 3.06% | 4.15%
Net periodic benefit cost for the year: |  |  |  |
Service cost |  |  | $ 0 | $ 0
Interest cost |  |  | 80 | 99
Expected return on plan assets |  |  | 0 | 0
Amortization of prior service cost (credit) |  |  | 0 | 0
Amortization of net actuarial loss |  |  | 80 | 53
Curtailment cost (income) |  |  | 0 | 0
Net periodic benefit (income) cost |  |  | 160 | $ 152
Amounts that are estimated to be amortized from accumulated other comprehensive loss into net periodic benefit cost in the next fiscal year |  |  |  |
Net actuarial loss (gain) |  | $ 94 | 94 |
Total amount |  | 94 | 94 |
Expected Benefit Payments: |  |  |  |
Fiscal year ending September 30, 2021 |  | 9 | 9 |
Fiscal year ending September 30, 2022 |  | 20 | 20 |
Fiscal year ending September 30, 2023 |  | 33 | 33 |
Fiscal year ending September 30, 2024 |  | 50 | 50 |
Fiscal year ending September 30, 2025 |  | 69 | 69 |
Fiscal years ending September 30, 2026 through 2030 |  | $ 391 | $ 391 |
Assumed health care cost trend rates related to the measurement of entity's postretirement medical obligations |  |  |  |
Health care cost trend rates assumed for next year |  | 6.75% | 6.75% | 7.00%
Ultimate cost trend rate |  | 5.00% | 5.00% | 5.00%
Year that the rate reaches the ultimate trend rate |  |  | 2028 | 2028
Health care cost trend rates assumed for current fiscal year |  |  | 7.00% |
Effects of one-percentage-point change in the assumed health care cost trend rates |  |  |  |
Effect on total service and interest cost components, increase |  |  | $ 18 |
Effect on accumulated postretirement benefit obligations, increase |  |  | 620 |
Effect on total service and interest cost components, decrease |  |  | (14) |
Effect on accumulated postretirement benefit obligations, decrease |  |  | (488) |
Pension Plan And Supplemental Employee Retirement Plan |  |  |  |
Other disclosures |  |  |  |
Curtailment gain, net of taxes of $0 |  |  | 1,726 |
Reduction in unrecognized benefit costs previously included in AOCI |  |  | $ 1,726 |

X
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- Definition The assumed health care cost trend rate for the current year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References No definition available. + Details
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