Income Taxes (Schedule Of Provision For (Benefit From) Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Federal	$ 13,130	$ 3,009	$ 2,423
State	(945)	2,003	340
Foreign	33,867	28,213	17,881
Current provision for income taxes	46,052	33,225	20,644
Federal	22,911	(12,594)	4,911
State	1,759	(445)	877
Foreign	(22,962)	(43,517)	(34,077)
Deferred provision for (benefit from) income taxes	1,708	(56,556)	(28,289)
Benefit for income taxes	$ 47,760	$ (23,331)	$ (7,645)