Income Taxes (Schedule Of Significant Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Apr. 30, 2019
Deferred tax assets:
Accounts receivable	$ 1,730	$ 1,852
Product liability	862	2,133
Employee benefits	5,189	6,192
Operating leases	33,258
Other	4,330	3,272
Gross deferred tax assets, before valuation allowance	50,364	17,888
Valuation allowance	(4,415)	(3,630)
Gross deferred tax assets, after valuation allowance	45,949	14,258
Deferred tax liabilities:
Pension benefits	0	119
Inventory	125	76
Depreciation	24,147	23,721
Intangibles	40,677	53,259
Operating leases	32,325
Other	695	1,059
Total	97,969	78,234
Net deferred tax liability	52,020	63,976
State [Member]
Deferred tax assets:
Tax credit carryforwards	$ 4,995	$ 4,439