Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Taxes [Abstract]
U.S. Federal statutory rate	35.00%	35.00%	35.00%
State and local taxes net of Federal tax benefit	2.10%	1.30%	2.40%
Effect of foreign affiliates	(2.80%)	(4.40%)	1.10%
Earnings of unconsolidated affiliates	(2.00%)	(3.20%)	1.90%
R&D credit	(1.00%)	(0.40%)	(0.00%)
Domestic production activity deduction	(0.00%)	(0.80%)	0.70%
Partnership income	1.60%	1.90%	(1.30%)
Provision to return adjustments	0.10%	(0.90%)	(0.40%)
Meals and entertainment	0.30%	0.50%	(0.30%)
Change in deferred rate	0.00%	0.00%	0.10%
Uncertain tax positions	(1.70%)	(1.60%)	(0.30%)
Valuation allowance	1.50%	0.00%	0.00%
Other	1.80%	2.00%	0.10%
Effective income tax rate	34.90%	29.40%	39.00%