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PENSION AND POSTRETIREMENT PLANS - Schedule of Weighted-Average Assumptions used in Valuations of Pension Benefits (Details) - Pension Plan | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
U.S. Plans |  |  |
Net pension expense |  |  |
Discount rate used to determine service cost | 5.29% | 6.09% | 5.66%
Discount rate used to determine interest cost | 4.67% | 5.94% | 5.49%
Expected return on plan assets | 6.50% | 6.50% | 6.00%
Rate of compensation increase | 4.00% | 4.00% | 4.00%
Benefit obligations |  |  |
Discount rate | 5.27% | 4.97% | 6.03%
Rate of compensation increase | 4.00% | 4.00% | 4.00%
Non-U.S. Plans |  |  |
Net pension expense |  |  |
Discount rate used to determine service cost | 4.70% | 5.20% | 4.90%
Discount rate used to determine interest cost | 4.70% | 5.20% | 4.90%
Expected return on plan assets | 4.60% | 4.70% | 4.40%
Rate of compensation increase | 3.90% | 3.90% | 4.00%
Benefit obligations |  |  |
Discount rate | 5.20% | 4.70% | 5.20%
Rate of compensation increase | 4.10% | 3.90% | 3.90%

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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 5 -Subparagraph (j)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: 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 increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (j)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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