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Note 1 - Significant Accounting Policies (Details Textual)
Pure in Thousands, $ in Millions
12 Months Ended
Apr. 30, 2022
USD ($)
shares
May 01, 2021
USD ($)
shares
May 02, 2020
USD ($)
shares
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements (in shares) | shares 276,000 340,000 400,000
Self Insurance Reserve and Coverage by Insurance, Noncurrent $ 5.9 $ 5.9  
Self Insurance Reserve, Noncurrent, Covered by Insurance 4.6 4.6  
Inventory, Finished Goods, Gross 58.6 43.3  
Inventory, Raw Materials, Gross 44.7 28.2  
Marketing Expense 47.6 43.4 $ 54.8
Shipping and Handling Costs $ 87.7 $ 75.5 $ 69.8
Customer Concentration Risk [Member] | Accounts Receivable [Member]      
Number of Major Customers 0 0  
Customer Concentration Risk [Member] | Revenue Benchmark [Member]      
Number of Major Customers 0 0 0
Building and Building Improvements [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life (Year) 5 years    
Building and Building Improvements [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life (Year) 30 years    
Machinery and Equipment [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life (Year) 3 years    
Machinery and Equipment [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life (Year) 15 years