Income Taxes (Schedule Of Significant Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Apr. 30, 2019	Apr. 30, 2018
Deferred tax assets:
Accounts receivable	$ 1,852	$ 4,772
Product liability	2,133	2,180
Employee benefits	6,192	6,513
Other	3,272	2,865
Gross deferred tax assets, before valuation allowance	17,888	20,267
Valuation allowance	(3,630)	(2,467)
Gross deferred tax assets, after valuation allowance	14,258	17,800
Deferred tax liabilities:
Pension benefits	119	1,035
Inventory	76	240
Depreciation	23,721	21,076
Intangibles	53,259	65,294
Other	1,059	986
Total	78,234	88,631
Net deferred tax liability	63,976	70,831
State [Member]
Deferred tax assets:
Tax credit carryforwards	$ 4,439	$ 3,937