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, 2023	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Net (gain) loss arising during the period	$ 9,401	$ 6,318	$ 27,809
Prior service cost due to plan amendment			611
Amortization of: Net (losses) gains	823	(720)	(1,502)
Prior service (cost) benefit	(720)	(1,004)	(995)
Foreign currency exchange rate changes on minimum retirement benefit liabilities	247	1,158	(855)
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning of year	13,300	19,083
Net (gain) loss arising during the period	(8,719)	(2,814)
Amortization of: Net (losses) gains	328	(814)
Prior service (cost) benefit	(720)	(1,004)
Foreign currency exchange rate changes on minimum retirement benefit liabilities	(245)	(1,151)
End of year	3,944	13,300	19,083
Defined Benefit Pension Plan [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning of year	18,297	(6,361)
Net (gain) loss arising during the period	(6,003)	25,898
Amortization of: Net (losses) gains	(292)	(259)
Prior service (cost) benefit	(698)	(981)
End of year	11,304	18,297	(6,361)
Defined Benefit Pension Plan [Member] | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Beginning of year	(4,997)	25,444
Net (gain) loss arising during the period	(2,716)	(28,712)
Amortization of: Net (losses) gains	620	(555)
Prior service (cost) benefit	(22)	(23)
Foreign currency exchange rate changes on minimum retirement benefit liabilities	(245)	(1,151)
End of year	(7,360)	(4,997)	25,444
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning of year	(6,225)	(2,815)
Net (gain) loss arising during the period	(682)	(3,504)
Amortization of: Net (losses) gains	495	94
End of year	$ (6,412)	$ (6,225)	$ (2,815)