Income Taxes (Schedule Of Provision For (Benefit From) Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Federal	$ 2,417	$ 3,907	$ 12,792
State	571	599	2,062
Foreign	28,467	23,823	31,010
Current provision for income taxes	31,455	28,329	45,864
Federal	965	(20,809)	(13,200)
State	515	(566)	(2,085)
Foreign	(45,662)	(27,986)	(4,661)
Deferred provision for (benefit from) income taxes	(44,182)	(49,361)	(19,946)
Total provision for income taxes	$ (12,727)	$ (21,032)	$ 25,918