Income Taxes (Schedule Of Significant Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Apr. 30, 2023	Apr. 30, 2022
Deferred tax assets:
Accounts receivable	$ 2,755	$ 1,941
Inventory	900	0
Product liability	2,031	1,739
Employee benefits	6,824	5,604
Operating leases liabilities	26,884	29,255
Section 174 research and development	5,258	0
Section 263A costs	1,002	386
Other	1,892	1,476
Gross deferred tax assets, before valuation allowance	53,466	45,943
Valuation allowance	(5,573)	(5,122)
Gross deferred tax assets, after valuation allowance	47,893	40,821
Deferred tax liabilities:
Pension benefits	227	194
Inventory	0	1,095
Depreciation	22,464	27,178
Intangibles	6,830	18,085
Operating leases right-of-use assets	24,681	26,980
Interest rate swaps	3,518	3,457
Other	634	703
Gross deferred tax liabilities	58,354	77,692
Net deferred tax liability	10,461	36,871
State [Member]
Deferred tax assets:
Tax credit carryforwards	$ 5,920	$ 5,542