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Note 1 - Significant Accounting Policies (Details Textual)
Pure in Thousands, $ in Millions
12 Months Ended
May 02, 2020
USD ($)
shares
Apr. 27, 2019
USD ($)
shares
Apr. 28, 2018
USD ($)
shares
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements (in shares) | shares 200,000 284,000 323,000
Self Insurance Reserve and Coverage by Insurance, Noncurrent $ 5.5 $ 5.7  
Self Insurance Reserve, Noncurrent, Covered by Insurance 4.3    
Inventory, Finished Goods, Gross, Total 39.1 48.7  
Inventory, Raw Materials, Gross, Total 24.4 22.0  
Marketing Expense 54.8 55.3 $ 49.7
Shipping and Handling Costs $ 69.8 $ 72.4 $ 63.3
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