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Pension and Retirement Plans - Assumptions used for projected benefit obligation (Details) - Pension:
Sep. 30, 2024
Sep. 30, 2023
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate: 4.86% 5.62%
International    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate: 5.00% 5.40%
Expected return on plan assets: 4.70% 5.10%