Income Taxes (Summary Of Valuation Allowance) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowance beginning of year	$ 279,683	$ 235,500	$ 198,200
Net release of valuation allowance	(2,800)	(9,100)	(3,100)
Net increase in deferred tax assets for foreign jurisdictions with a full valuation allowance	(134,900)	53,300	39,800
Establish valuation allowance in foreign jurisdictions	0	0	600
Valuation allowance end of year	$ 141,950	$ 279,683	$ 235,500