Income Tax Expense - Principal Components Of Income Tax Expense (Benefit) From Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Federal:
Current	$ 24,192	$ 7,248	$ 14,807
Deferred	(5,816)	9,752	(1,598)
State and local:
Current	3,563	1,635	2,257
Deferred	(1,038)	1,774	(786)
Foreign:
Current	5,694	4,645	2,922
Deferred	(193)	(939)	(427)
Total	$ 26,402	$ 24,115	$ 17,175