Note 1 - Significant Accounting Policies (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 25, 2025	Jan. 27, 2024	Jan. 25, 2025	Jan. 27, 2024	Apr. 27, 2024	Apr. 29, 2023
Money Market Funds, at Carrying Value	$ 77.2		$ 77.2		$ 240.7
Accounts Receivable, Allowance for Credit Loss	1.3		1.3		0.9
Accounts Receivable, after Allowance for Credit Loss		$ 101.7		$ 101.7		$ 104.9
Inventory, Finished Goods, Gross	46.1		46.1		50.3
Inventory, Raw Materials, Gross	38.9		38.9		$ 34.3
Shipping and Handling Costs	17.5	17.7	55.5	58.3
Marketing Expense	$ 10.1	$ 11.0	$ 33.2	$ 35.1
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements (in shares)	74,000	186,000	82,000	229,000