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Retirement Benefits (Schedule of Expected Benefit Payments) (Details) - Defined Benefit Pension Plan [Member]
$ in Thousands
Sep. 30, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 8,476
2019 9,489
2020 9,704
2021 10,461
2022 10,781
2023 - 2027 60,877
UNITED STATES  
Defined Benefit Plan Disclosure [Line Items]  
2018 6,251
2019 6,911
2020 7,521
2021 8,065
2022 8,524
2023 - 2027 48,075
Foreign Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 2,225
2019 2,578
2020 2,183
2021 2,396
2022 2,257
2023 - 2027 $ 12,802