Retirement Plans - Schedule of Asset Allocations and Weighted-Average Target Allocations (Details)	Sep. 30, 2023	Sep. 30, 2022
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%