Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 567	$ 962	$ 1,666	$ 2,969
Interest cost	2,629	1,715	7,806	5,204
Expected return on plan assets	(2,660)	(3,309)	(7,933)	(10,021)
Amortization of: Net actuarial loss (gain)	(88)	201	(243)	622
Amortization of: Prior service cost	179	252	539	754
Net periodic retirement pension cost (benefit)	627	(179)	1,835	(472)
Contributions paid	470	434	1,763	1,933
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	1	1
Interest cost	226	144	678	433
Amortization of: Net actuarial loss (gain)	(124)	(24)	(372)	(71)
Net periodic retirement pension cost (benefit)	103	121	307	363
Contributions paid - other postretirement plans	415	451	1,300	1,379
United States [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	223	389	670	1,166
Interest cost	1,824	1,320	5,473	3,961
Expected return on plan assets	(2,074)	(2,713)	(6,223)	(8,140)
Amortization of: Net actuarial loss (gain)	73	65	219	194
Amortization of: Prior service cost	174	246	523	736
Net periodic retirement pension cost (benefit)	220	(693)	662	(2,083)
Other Countries [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	344	573	996	1,803
Interest cost	805	395	2,333	1,243
Expected return on plan assets	(586)	(596)	(1,710)	(1,881)
Amortization of: Net actuarial loss (gain)	(161)	136	(462)	428
Amortization of: Prior service cost	5	6	16	18
Net periodic retirement pension cost (benefit)	407	514	1,173	1,611
Contributions paid	$ 470	$ 434	$ 1,763	$ 1,933