Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 556	$ 997	$ 1,099	$ 2,007
Interest cost	2,603	1,743	5,177	3,489
Expected return on plan assets	(2,648)	(3,354)	(5,273)	(6,712)
Amortization of: Net actuarial loss (gain)	(80)	210	(155)	421
Amortization of: Prior service cost	181	251	360	502
Net periodic retirement pension cost	612	(153)	1,208	(293)
Contributions paid	736	811	1,298	1,499
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	226	145	452	289
Amortization of: Net actuarial loss (gain)	(124)	(23)	(248)	(47)
Net periodic retirement pension cost	102	122	204	242
Contributions paid - other postretirement plans	444	457	885	928
United States [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	224	388	447	777
Interest cost	1,825	1,321	3,649	2,641
Expected return on plan assets	(2,075)	(2,714)	(4,149)	(5,427)
Amortization of: Net actuarial loss (gain)	73	64	146	129
Amortization of: Prior service cost	175	245	349	490
Net periodic retirement pension cost	222	(696)	442	(1,390)
Other Countries [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	332	609	652	1,230
Interest cost	778	422	1,528	848
Expected return on plan assets	(573)	(640)	(1,124)	(1,285)
Amortization of: Net actuarial loss (gain)	(153)	146	(301)	292
Amortization of: Prior service cost	6	6	11	12
Net periodic retirement pension cost	390	543	766	1,097
Contributions paid	$ 736	$ 811	$ 1,298	$ 1,499