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Employee Retirement Plans - Pension Plans Assets (Details) - Pension Benefits - U.S. | Sep. 30, 2023 | Sep. 30, 2022
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Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 100.00% | 100.00%
Target Asset Allocation | 100.00% | 100.00%
Target allocation range | 5.00% |
Equity investments |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 61.40% | 61.20%
Target Asset Allocation | 61.60% | 58.70%
U.S. equities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 25.80% | 26.50%
Target Asset Allocation | 27.60% | 24.70%
Non-U.S. equities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 21.70% | 20.90%
Target Asset Allocation | 23.30% | 20.90%
Global equities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 13.90% | 13.80%
Target Asset Allocation | 10.70% | 13.10%
Fixed income funds & cash equivalents |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 35.50% | 35.50%
Target Asset Allocation | 35.00% | 35.00%
Alternative investments |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 3.10% | 3.30%
Target Asset Allocation | 3.40% | 6.30%

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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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