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Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 875 $ 569
Interest cost 2,076 1,830
Expected return on plan assets (3,658) (3,590)
Amortization of: Net actuarial loss 225 222
Amortization of: Prior service (benefit) cost 177 177
Net periodic retirement (benefit) cost (305) (792)
Contributions paid - pensions 554 312
Other Postretirement Benefit Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 1 2
Interest cost 288 292
Amortization of: Net actuarial loss 14 24
Amortization of: Prior service (benefit) cost (1) (40)
Curtailment (gain) loss   (330)
Net periodic retirement (benefit) cost 302 (52)
Contributions paid - other postretirement plans 373 226
United States [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 363 411
Interest cost 1,596 1,501
Expected return on plan assets (2,996) (2,904)
Amortization of: Net actuarial loss 154 150
Amortization of: Prior service (benefit) cost 177 177
Net periodic retirement (benefit) cost (706) (665)
Foreign Plan [Member] | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 512 158
Interest cost 480 329
Expected return on plan assets (662) (686)
Amortization of: Net actuarial loss 71 72
Net periodic retirement (benefit) cost 401 (127)
Contributions paid - pensions $ 554 $ 312