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Employee Retirement Plans - Pension Plans Assets (Details) - U.S. - Pension Benefits | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 100.00% | 100.00%
Target Asset Allocation | 100.00% | 100.00%
Permitted target allocation range | 5.00% |
Equity investments |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 52.40% | 61.40%
Target Asset Allocation | 53.20% | 61.60%
Fixed income funds & cash equivalents |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 44.90% | 35.50%
Target Asset Allocation | 43.40% | 35.00%
Alternative investments |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 2.70% | 3.10%
Target Asset Allocation | 3.40% | 3.40%

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- Definition Defined Benefit Plan, Plan Assets, Target Allocation Range, Percentage + References No definition available. + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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