Income Taxes (Summary Of Valuation Allowance) (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowance beginning of year		$ 235,503	$ 198,200	$ 177,500
Net release of valuation allowance	[1]	(9,100)	(3,100)	(18,700)
Net increase in deferred tax assets for foreign jurisdictions with a full valuation allowance		53,300	39,800	39,400
Establish valuation allowance in foreign jurisdictions		0	600	0
Valuation allowance end of year		$ 279,683	$ 235,503	$ 198,200

[1] In 2017 and 2016, this is attributable to the release in foreign jurisdictions. In 2015, this is attributable to a reduction in deferred tax assets associated with our U.S. pension plan