Retirement Benefits (Schedule of Changes in Plan Assets and Benefit Obligations Recorded in Other Comprehensive (Earnings) Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Net loss (gain) arising during the period	$ (7,826)	$ (9,401)	$ (6,318)
Prior service cost	1,121	0	0
Amortization of: Net (loss) gain	1,049	823	(720)
Prior service (cost) benefit	(721)	(720)	(1,004)
Foreign currency exchange rate changes on minimum retirement benefit liabilities	110	247	1,158
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning of year	3,944	13,300
Net loss (gain) arising during the period	(8,382)	(8,719)
Prior service cost	1,121
Amortization of: Net (loss) gain	453	328
Prior service (cost) benefit	(721)	(720)
Foreign currency exchange rate changes on minimum retirement benefit liabilities	(110)	(245)
End of year	(3,695)	3,944	13,300
Defined Benefit Pension Plan [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning of year	11,304	18,297
Net loss (gain) arising during the period	(11,050)	(6,003)
Prior service cost	1,121
Amortization of: Net (loss) gain	(226)	(292)
Prior service (cost) benefit	(698)	(698)
End of year	451	11,304	18,297
Defined Benefit Pension Plan [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Beginning of year	(7,360)	(4,997)
Net loss (gain) arising during the period	2,668	(2,716)
Amortization of: Net (loss) gain	679	620
Prior service (cost) benefit	(23)	(22)
Foreign currency exchange rate changes on minimum retirement benefit liabilities	(110)	(245)
End of year	(4,146)	(7,360)	(4,997)
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning of year	(6,412)	(6,225)
Net loss (gain) arising during the period	597	(682)
Amortization of: Net (loss) gain	555	495
End of year	$ (5,260)	$ (6,412)	$ (6,225)