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Retirement Plans - Schedule of Weighted-Average Assumptions used in Valuations of Pension Benefits (Details) | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
U.S. Plans |  |  |
Net pension expense |  |  |
Discount rate used to determine service cost | 5.66% | 3.16% | 3.16%
Discount rate used to determine interest cost | 5.49% | 2.31% | 2.10%
Expected return on plan assets | 6.00% | 6.00% | 6.50%
Rate of compensation increase | 4.00% | 4.00% | 3.25%
Benefit obligations |  |  |
Discount rate | 6.03% | 5.64% | 2.92%
Rate of compensation increase | 4.00% | 4.00% | 3.25%
Non-U.S. Plans |  |  |
Net pension expense |  |  |
Discount rate used to determine service cost | 4.90% | 2.20% | 1.90%
Discount rate used to determine interest cost | 4.90% | 2.20% | 1.90%
Expected return on plan assets | 4.40% | 4.40% | 5.60%
Rate of compensation increase | 4.00% | 3.70% | 3.60%
Benefit obligations |  |  |
Discount rate | 5.20% | 4.90% | 2.20%
Rate of compensation increase | 3.90% | 4.00% | 3.70%

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- Definition Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Interest Rate + References No definition available. + Details
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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 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 1 -Subparagraph (k)(2) -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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