Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 872	$ 693	$ 2,621	$ 1,838
Interest cost	2,073	1,887	6,230	5,562
Expected return on plan assets	(3,659)	(3,607)	(10,986)	(10,817)
Amortization of: Net actuarial loss	225	224	678	670
Amortization of: Prior service (benefit) cost	177	177	532	532
Net periodic retirement pension (benefit) cost	(312)	(626)	(925)	(2,215)
Contributions paid	319	227	1,382	658
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	4	5
Interest cost	288	291	865	874
Amortization of: Net actuarial loss	13	24	41	72
Amortization of: Prior service (benefit) cost	(1)	(40)	(4)	(119)
Curtailment gain				(330)
Net periodic retirement pension (benefit) cost	301	276	906	502
Contributions paid - other postretirement plans	512	595	1,589	1,830
United States | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	363	410	1,088	1,232
Interest cost	1,596	1,501	4,788	4,503
Expected return on plan assets	(2,996)	(2,904)	(8,989)	(8,711)
Amortization of: Net actuarial loss	154	150	463	449
Amortization of: Prior service (benefit) cost	177	177	532	532
Net periodic retirement pension (benefit) cost	(706)	(666)	(2,118)	(1,995)
Other Countries [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	509	283	1,533	606
Interest cost	477	386	1,442	1,059
Expected return on plan assets	(663)	(703)	(1,997)	(2,106)
Amortization of: Net actuarial loss	71	74	215	221
Net periodic retirement pension (benefit) cost	394	40	1,193	(220)
Contributions paid	$ 319	$ 227	$ 1,382	$ 658