Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2	$ 4
Interest cost	292	311
Amortization of: Net (gains) losses	24	50
Amortization of: Prior service (benefit) cost	(40)	(40)
Curtailment (gain) loss	(330)
Net periodic retirement (benefit) cost	(52)	325
Contributions paid - other postretirement plans	226	615
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	569	611
Interest cost	1,830	1,735
Expected return on plan assets	(3,590)	(3,273)
Amortization of: Net (gains) losses	222	591
Amortization of: Prior service (benefit) cost	177	96
Net periodic retirement (benefit) cost	(792)	(240)
Contributions paid - pensions	312	365
Defined Benefit Pension Plan [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Service cost	411	419
Interest cost	1,501	1,439
Expected return on plan assets	(2,904)	(2,632)
Amortization of: Net (gains) losses	150	464
Amortization of: Prior service (benefit) cost	177	96
Net periodic retirement (benefit) cost	(665)	(214)
Defined Benefit Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	158	192
Interest cost	329	296
Expected return on plan assets	(686)	(641)
Amortization of: Net (gains) losses	72	127
Net periodic retirement (benefit) cost	(127)	(26)
Contributions paid - pensions	$ 312	$ 365