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Employee Retirement Plans - Schedule of Pension Plans (Details) - U.S. - Pension Benefits | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
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 | 45.60% | 52.40%
Target Asset Allocation | 46.00% | 53.20%
Fixed income funds & cash equivalents |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 52.30% | 44.90%
Target Asset Allocation | 51.80% | 43.40%
Alternative investments |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 2.10% | 2.70%
Target Asset Allocation | 2.20% | 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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