Retirement Benefits (Schedule of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,019	$ 2,226	$ 3,893
Interest cost	10,811	10,434	6,893
Expected return on plan assets	(11,490)	(10,597)	(13,287)
Amortization of: Net loss (gain)	(453)	(328)	814
Amortization of: Net prior service cost	721	720	1,004
Net periodic cost (benefit)	1,608	2,455	(683)
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		1	1
Interest cost	902	904	577
Amortization of: Net loss (gain)	(555)	(495)	(94)
Net periodic cost (benefit)	347	410	484
United States [Member] | Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	775	893	1,554
Interest cost	7,598	7,297	5,281
Expected return on plan assets	(9,084)	(8,297)	(10,853)
Amortization of: Net loss (gain)	226	292	259
Amortization of: Net prior service cost	698	698	981
Net periodic cost (benefit)	213	883	(2,778)
Foreign Plan | Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,244	1,333	2,339
Interest cost	3,213	3,137	1,612
Expected return on plan assets	(2,406)	(2,300)	(2,434)
Amortization of: Net loss (gain)	(679)	(620)	555
Amortization of: Net prior service cost	23	22	23
Net periodic cost (benefit)	$ 1,395	$ 1,572	$ 2,095