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RETIREMENT PLANS - WEIGHTED AVEARAGE BENEFIT OBLIGATIONS AND NET BENEFIT (INCOME) COST (Details) | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Pension Plan |  |
Assumptions used to determine fiscal year-end benefit obligations: |  |
Discount rate | 5.62% | 5.25%
Assumptions used to determine net benefit costs (years ended): |  |
Discount rate | 5.25% | 2.84%
Expected return on plan assets | 6.00% | 5.00%
SERP |  |
Assumptions used to determine fiscal year-end benefit obligations: |  |
Discount rate | 5.62% | 5.25%
Assumptions used to determine net benefit costs (years ended): |  |
Discount rate | 5.25% | 2.84%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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