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Pension Benefit Obligations - Underlying assumptions (Details)
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
United States      
Weighted-average assumptions to determine benefit obligation:      
Discount rate (as a percent) 5.40% 2.46% 2.20%
Weighted-average assumptions to determine net periodic benefit cost:      
Discount rate (as a percent) 2.46% 2.20% 2.92%
Expected long-term rate of return on plan assets (as a percent) 6.25% 6.80% 7.30%
International.      
Weighted-average assumptions to determine benefit obligation:      
Discount rate (as a percent) 5.27% 1.98% 1.67%
Salary increase rate (as a percent) 3.48% 3.13% 2.68%
Weighted-average assumptions to determine net periodic benefit cost:      
Discount rate (as a percent) 1.98% 1.67% 1.81%
Salary increase rate (as a percent) 3.13% 2.68% 2.52%
Expected long-term rate of return on plan assets (as a percent) 3.93% 3.95% 4.03%