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Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 4,524 $ 3,487 $ 2,767
Interest cost 6,868 8,290 7,530
Expected return on plan assets (15,173) (14,624) (14,394)
Amortization of: Net losses 2,476 900 889
Amortization of: Prior service cost (benefit) 959 709 709
Net periodic (benefit) cost (346) (1,238) (2,499)
Other Postretirement Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 2 5 7
Interest cost 782 1,154 1,165
Amortization of: Net losses 47 55 94
Amortization of: Prior service cost (benefit) 3 (5) (158)
Curtailment gain     (330)
Net periodic (benefit) cost 834 1,209 778
United States [Member] | Defined Benefit Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1,659 1,451 1,643
Interest cost 5,590 6,384 6,004
Expected return on plan assets (12,346) (11,986) (11,614)
Amortization of: Net losses 1,430 617 598
Amortization of: Prior service cost (benefit) 936 709 709
Net periodic (benefit) cost (2,731) (2,825) (2,660)
Foreign Plan | Defined Benefit Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 2,865 2,036 1,124
Interest cost 1,278 1,906 1,526
Expected return on plan assets (2,827) (2,638) (2,780)
Amortization of: Net losses 1,046 283 291
Amortization of: Prior service cost (benefit) 23    
Net periodic (benefit) cost $ 2,385 $ 1,587 $ 161