Income Taxes (Schedule Of Provision For (Benefit From) Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Federal	$ 3,907	$ 12,792	$ 7,081
State	599	2,062	1,512
Foreign	23,823	31,010	13,586
Current provision for income taxes	28,329	45,864	22,179
Federal	(20,809)	(13,200)	(38,224)
State	(566)	(2,085)	(4,718)
Foreign	(27,986)	(4,661)	3,228
Deferred provision for (benefit from) income taxes	(49,361)	(19,946)	(39,714)
Total provision for income taxes	$ (21,032)	$ 25,918	$ (17,535)