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Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 2,349 $ 2,019 $ 2,226
Interest cost 9,858 10,811 10,434
Expected return on plan assets (13,488) (11,490) (10,597)
Amortization of: Net loss (gain) (242) (453) (328)
Amortization of: Net prior service cost 785 721 720
Net periodic (benefit) cost (738) 1,608 2,455
Other Postretirement Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost     1
Interest cost 717 902 904
Amortization of: Net loss (gain) (441) (555) (495)
Net periodic (benefit) cost 276 347 410
United States [Member] | Defined Benefit Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 917 775 893
Interest cost 6,875 7,598 7,297
Expected return on plan assets (10,992) (9,084) (8,297)
Amortization of: Net loss (gain) 171 226 292
Amortization of: Net prior service cost 762 698 698
Net periodic (benefit) cost (2,267) 213 883
Foreign Plan | Defined Benefit Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1,432 1,244 1,333
Interest cost 2,983 3,213 3,137
Expected return on plan assets (2,496) (2,406) (2,300)
Amortization of: Net loss (gain) (413) (679) (620)
Amortization of: Net prior service cost 23 23 22
Net periodic (benefit) cost $ 1,529 $ 1,395 $ 1,572