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Retirement Benefits (Schedule of Expected Benefit Payments) (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Defined Benefit Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 10,801
2021 11,186
2022 11,622
2023 12,729
2024 13,080
2025 - 2029 70,633
Other Postretirement Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 3,237
2021 3,220
2022 3,183
2023 3,125
2024 3,061
2025 - 2029 13,891
United States [Member] | Defined Benefit Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 7,170
2021 7,823
2022 8,383
2023 8,924
2024 9,385
2025 - 2029 51,139
Other Countries [Member] | Defined Benefit Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 3,631
2021 3,363
2022 3,239
2023 3,805
2024 3,695
2025 - 2029 $ 19,494