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Note 1 - Significant Accounting Policies (Details Textual)
Pure in Thousands, $ in Millions
12 Months Ended
Apr. 27, 2024
USD ($)
shares
Apr. 29, 2023
USD ($)
shares
Apr. 30, 2022
USD ($)
shares
Inventory, Finished Goods, Gross $ 50.3 $ 54.3  
Inventory, Raw Materials, Gross 34.3 39.2  
Self Insurance Reserve and Coverage by Insurance, Noncurrent 5.5 5.5  
Self Insurance Reserve, Noncurrent, Covered by Insurance 4.0 4.1  
Shipping and Handling Costs 77.8 86.8 $ 87.7
Marketing Expense $ 50.0 $ 44.1 $ 47.6
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements (in shares) | shares 201,000 261,000 276,000
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    
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