Income Taxes (Schedule Of Provision For (Benefit From) Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Federal	$ 3,009	$ 2,423	$ 2,417
State	2,003	340	571
Foreign	28,213	17,881	28,467
Current provision for income taxes	33,225	20,644	31,455
Federal	(12,594)	4,911	965
State	(445)	877	515
Foreign	(43,517)	(34,077)	(45,662)
Deferred provision for (benefit from) income taxes	(56,556)	(28,289)	(44,182)
Benefit from income taxes	$ (23,331)	$ (7,645)	$ (12,727)