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Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,120 $ 872 $ 3,368 $ 2,621
Interest cost 1,711 2,073 5,146 6,230
Expected return on plan assets (3,777) (3,659) (11,490) (10,986)
Amortization of: Net actuarial loss 615 225 1,851 678
Amortization of: Prior service cost (benefit) 239 177 719 532
Net periodic retirement pension (benefit) cost (92) (312) (406) (925)
Contributions paid 335 319 2,067 1,382
Other Postretirement Benefit Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 2 4
Interest cost 195 288 586 865
Amortization of: Net actuarial loss 12 13 35 41
Amortization of: Prior service cost (benefit) 1 (1) 2 (4)
Net periodic retirement pension (benefit) cost 209 301 625 906
Contributions paid - other postretirement plans 851 512 1,372 1,589
United States [Member] | Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 414 363 1,244 1,088
Interest cost 1,398 1,596 4,193 4,788
Expected return on plan assets (3,087) (2,996) (9,260) (8,989)
Amortization of: Net actuarial loss 358 154 1,073 463
Amortization of: Prior service cost (benefit) 234 177 702 532
Net periodic retirement pension (benefit) cost (683) (706) (2,048) (2,118)
Other Countries [Member] | Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 706 509 2,124 1,533
Interest cost 313 477 953 1,442
Expected return on plan assets (690) (663) (2,230) (1,997)
Amortization of: Net actuarial loss 257 71 778 215
Amortization of: Prior service cost (benefit) 5   17  
Net periodic retirement pension (benefit) cost 591 394 1,642 1,193
Contributions paid $ 335 $ 319 $ 2,067 $ 1,382