Income Tax Expense - Principal Components Of Income Tax Expense (Benefit) From Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Tax Expense
Federal, Current	$ 14,097	$ 9,174	$ 21,448
Federal, Deferred	1,020	(22,943)	628
State and local, Current	3,189	2,121	1,795
State and local, Deferred	204	2,972	(49)
Foreign, Current	2,493	2,233	4,450
Foreign, Deferred	174	2,330	(1,822)
Total	$ 21,177	$ (4,113)	$ 26,450