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Retirement Benefits (Schedule of Expected Benefit Payments) (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
Defined Benefit Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2022 $ 11,743
2023 12,829
2024 13,159
2025 13,477
2026 13,747
2027 – 2031 74,984
Other Postretirement Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2022 2,799
2023 2,754
2024 2,699
2025 2,634
2026 2,554
2027 – 2031 11,089
United States [Member] | Defined Benefit Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2022 8,393
2023 8,922
2024 9,349
2025 9,700
2026 9,988
2027 – 2031 52,659
Foreign Plan | Defined Benefit Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2022 3,350
2023 3,907
2024 3,810
2025 3,777
2026 3,759
2027 – 2031 $ 22,325