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Retirement Benefits (Schedule of Expected Benefit Payments) (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
Defined Benefit Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 11,143
2022 11,627
2023 12,761
2024 13,124
2025 13,439
2026 – 2030 72,840
Other Postretirement Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 3,113
2022 3,078
2023 3,017
2024 2,949
2025 2,867
2026 – 2030 12,690
United States [Member] | Defined Benefit Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 7,650
2022 8,280
2023 8,809
2024 9,283
2025 9,647
2026 – 2030 51,942
Foreign Plan | Defined Benefit Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 3,493
2022 3,347
2023 3,952
2024 3,841
2025 3,792
2026 – 2030 $ 20,898