Income Taxes (Summary Of Valuation Allowance) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowance beginning of year	$ 141,950	$ 279,700	$ 235,500
Net release of valuation allowance	(1,800)	(2,800)	(9,100)
Net increase in deferred tax assets for foreign jurisdictions with a full valuation allowance	37,500	(134,900)	53,300
Valuation allowance end of year	$ 177,663	$ 141,950	$ 279,700