Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 997	$ 1,168	$ 2,007	$ 2,329
Interest cost	1,743	1,582	3,489	3,154
Expected return on plan assets	(3,354)	(4,161)	(6,712)	(8,299)
Amortization of: Net actuarial (gain) loss	210	369	421	732
Amortization of: Prior service cost	251	249	502	497
Net periodic retirement pension (benefit) cost	(153)	(793)	(293)	(1,587)
Contributions paid	811	675	1,499	1,218
Net periodic retirement pension (benefit) cost	(153)	(793)	(293)	(1,587)
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		1		1
Interest cost	145	149	289	299
Amortization of: Net actuarial (gain) loss	(23)	8	(47)	15
Amortization of: Prior service cost		1		1
Net periodic retirement pension (benefit) cost	122	159	242	316
Net periodic retirement pension (benefit) cost	122	159	242	316
Contributions paid - other postretirement plans	457	940	928	978
United States [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	388	432	777	864
Interest cost	1,321	1,239	2,641	2,478
Expected return on plan assets	(2,714)	(3,536)	(5,427)	(7,072)
Amortization of: Net actuarial (gain) loss	64	135	129	270
Amortization of: Prior service cost	245	243	490	485
Net periodic retirement pension (benefit) cost	(696)	(1,487)	(1,390)	(2,975)
Net periodic retirement pension (benefit) cost	(696)	(1,487)	(1,390)	(2,975)
Other Countries [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	609	736	1,230	1,465
Interest cost	422	343	848	676
Expected return on plan assets	(640)	(625)	(1,285)	(1,227)
Amortization of: Net actuarial (gain) loss	146	234	292	462
Amortization of: Prior service cost	6	6	12	12
Net periodic retirement pension (benefit) cost	543	694	1,097	1,388
Contributions paid	811	675	1,499	1,218
Net periodic retirement pension (benefit) cost	$ 543	$ 694	$ 1,097	$ 1,388