Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 573	$ 506	$ 1,150	$ 1,009
Interest cost	2,435	2,703	4,882	5,395
Expected return on plan assets	(3,352)	(2,873)	(6,714)	(5,736)
Amortization of: Net actuarial loss (gain)	(56)	(115)	(113)	(226)
Amortization of: Prior service cost	195	180	392	360
Net periodic retirement pension (benefit) cost	(205)	401	(403)	802
Contributions paid	490	746	874	1,339
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	180	225	359	451
Amortization of: Net actuarial loss (gain)	(111)	(139)	(221)	(278)
Net periodic retirement pension (benefit) cost	69	86	138	173
Contributions paid - other postretirement plans	408	413	794	825
United States [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	230	194	459	388
Interest cost	1,718	1,900	3,437	3,799
Expected return on plan assets	(2,748)	(2,271)	(5,496)	(4,542)
Amortization of: Net actuarial loss (gain)	42	56	85	113
Amortization of: Prior service cost	190	175	381	349
Net periodic retirement pension (benefit) cost	(568)	54	(1,134)	107
Other Countries [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	343	312	691	621
Interest cost	717	803	1,445	1,596
Expected return on plan assets	(604)	(602)	(1,218)	(1,194)
Amortization of: Net actuarial loss (gain)	(98)	(171)	(198)	(339)
Amortization of: Prior service cost	5	5	11	11
Net periodic retirement pension (benefit) cost	363	347	731	695
Contributions paid	$ 490	$ 746	$ 874	$ 1,339