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Retirement Plans - Schedule of Asset Allocations and Weighted-Average Target Allocations (Details) | Sep. 30, 2023 | Sep. 30, 2022
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U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, actual plan asset allocations | 100.00% | 100.00%
Defined benefit plan, target plan asset allocations | 100.00% |
U.S. Plans | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, actual plan asset allocations | 39.00% | 39.00%
U.S. Plans | Equity securities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, target plan asset allocations | 35.00% |
U.S. Plans | Equity securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, target plan asset allocations | 45.00% |
U.S. Plans | Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, actual plan asset allocations | 51.00% | 54.00%
U.S. Plans | Debt securities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, target plan asset allocations | 50.00% |
U.S. Plans | Debt securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, target plan asset allocations | 60.00% |
U.S. Plans | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, actual plan asset allocations | 10.00% | 7.00%
U.S. Plans | Other | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, target plan asset allocations | 0.00% |
U.S. Plans | Other | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, target plan asset allocations | 10.00% |
Non-U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, actual plan asset allocations | 100.00% | 100.00%
Defined benefit plan, target plan asset allocations | 100.00% |
Non-U.S. Plans | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, actual plan asset allocations | 8.00% | 11.00%
Non-U.S. Plans | Equity securities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, target plan asset allocations | 5.00% |
Non-U.S. Plans | Equity securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, target plan asset allocations | 15.00% |
Non-U.S. Plans | Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, actual plan asset allocations | 75.00% | 73.00%
Non-U.S. Plans | Debt securities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, target plan asset allocations | 70.00% |
Non-U.S. Plans | Debt securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, target plan asset allocations | 80.00% |
Non-U.S. Plans | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, actual plan asset allocations | 17.00% | 16.00%
Non-U.S. Plans | Other | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, target plan asset allocations | 10.00% |
Non-U.S. Plans | Other | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, target plan asset allocations | 20.00% |

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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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