Income Taxes (Components of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Current:
Federal	$ 41,195	$ 21,869	$ 15,109
State	2,641	2,310	853
Foreign	39,719	27,577	34,354
Deferred:
Federal	(38,136)	(13,216)	(8,369)
State	(10,006)	(8,623)	(2,658)
Foreign	7,987	(1,717)	(2,139)
Income tax expense	$ 43,400	$ 28,200	$ 37,150