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Pension and Retirement Plans - Assumptions used for net periodic benefit cost (Details) - Pension
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate: 2.50% 3.00%
International    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate: 2.00% 1.60%
Expected return on plan assets: 4.00% 3.80%
Rate of compensation increase: 0.00% 0.00%