Note 7 - Derivative Financial Instruments (Details Textual) - USD ($) $ in Millions	Apr. 29, 2023	Apr. 30, 2022
Accrued Liabilities [Member]
Statement [Line Items]
Derivative Liability, Current	$ 4.6
Prepaid Expenses and Other Current Assets [Member]
Statement [Line Items]
Derivative Asset, Current		$ 8.8
Aluminum Swap Contracts [Member]
Statement [Line Items]
Derivative, Notional Amount	60.9
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months	$ 4.6