Income Tax Expense (Schedule Of Actual Income Tax Expense (Benefit) From Continuing Operations) (Details)	12 Months Ended
Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2016
Federal corporate statutory rate	24.50%	35.00%	35.00%	35.00%
State and local, net of Federal benefits	3.00%		2.40%	2.00%
Foreign	0.60%		(0.10%)	(1.00%)
Research credit	(1.60%)		(1.10%)	(2.50%)
Domestic production deduction	(1.10%)		(2.70%)	(2.80%)
Change in uncertain tax positions	(0.10%)		0.00%	0.00%
Executive compensation	(0.10%)		(0.10%)	0.90%
Valuation allowance	3.00%		(0.30%)	1.80%
Tax reform – impact on U.S. deferred tax assets and liabilities	(37.20%)		0.00%	0.00%
Tax reform – transition tax	1.50%		0.00%	0.00%
Tax reform – taxes related to foreign unremitted earnings	2.80%		0.00%	0.00%
Other, net	0.00%		(0.10%)	(0.50%)
Effective income tax rate	(4.70%)		33.00%	32.90%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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