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Retirement Plans - Weighted Average Assumptions (Details) - Pension plan - Weighted Average
Sep. 30, 2024
Sep. 30, 2023
U.S. Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Discount rate 4.99% 5.87%
Non-U.S. Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Discount rate 4.75% 5.60%
Rate of compensation increase 4.82% 4.53%