Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 506	$ 556	$ 1,009	$ 1,099
Interest cost	2,703	2,603	5,395	5,177
Expected return on plan assets	(2,873)	(2,648)	(5,736)	(5,273)
Amortization of: Net actuarial loss (gain)	(115)	(80)	(226)	(155)
Amortization of: Prior service cost	180	181	360	360
Net periodic retirement pension cost	401	612	802	1,208
Contributions paid	746	736	1,339	1,298
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	225	226	451	452
Amortization of: Net actuarial loss (gain)	139	(124)	278	248
Net periodic retirement pension cost	86	102	173	204
Contributions paid - other postretirement plans	413	444	825	885
United States [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	194	224	388	447
Interest cost	1,900	1,825	3,799	3,649
Expected return on plan assets	(2,271)	(2,075)	(4,542)	(4,149)
Amortization of: Net actuarial loss (gain)	56	73	113	146
Amortization of: Prior service cost	175	175	349	349
Net periodic retirement pension cost	54	222	107	442
Other Countries [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	312	332	621	652
Interest cost	803	778	1,596	1,528
Expected return on plan assets	(602)	(573)	(1,194)	(1,124)
Amortization of: Net actuarial loss (gain)	(171)	(153)	(339)	(301)
Amortization of: Prior service cost	5	6	11	11
Net periodic retirement pension cost	347	390	695	766
Contributions paid	$ 746	$ 736	$ 1,339	$ 1,298