Income Taxes (Schedule Of Reconciliations Of The U.S. Federal Statutory Tax Rate) (Details)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
U.S. Federal statutory rate	21.00%	21.00%	21.00%
State and local taxes, net of federal tax benefit	0.70%	0.60%	1.00%
Non-U.S. rate differential	2.00%	1.70%	1.80%
Non-U.S. tax holidays	(0.80%)	(1.10%)	(1.10%)
Research and development tax credits	(0.60%)	(1.80%)	(0.30%)
Foreign derived intangible income	(1.40%)	(1.20%)	(1.10%)
Non-U.S. subsidiary restructuring	(0.50%)	(4.40%)	(2.60%)
Other	(0.30%)	0.00%	(0.10%)
Effective income tax rate	20.10%	14.80%	18.60%