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Note 1 - Significant Accounting Policies (Details Textual)
$ in Millions
12 Months Ended
Apr. 29, 2017
USD ($)
shares
Apr. 30, 2016
USD ($)
shares
May 02, 2015
USD ($)
shares
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements | shares 206,000 219,000 206,000
Self Insurance Reserve, Noncurrent, Covered by Insurance $ 5.4 $ 4.8  
Inventory, Finished Goods, Gross 35.0 29.1  
Inventory, Raw Materials, Gross 18.4 18.8  
Marketing Expense 44.9 38.8 $ 42.4
Shipping, Handling and Transportation Costs $ 50.0 44.6 $ 44.4
Number of Operating Segments 1    
Building and Building Improvements [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life 7 years    
Building and Building Improvements [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life 30 years    
Machinery and Equipment [Member] | Minimum [Member]      
Property, Plant and Equipment, Useful Life 3 years    
Machinery and Equipment [Member] | Maximum [Member]      
Property, Plant and Equipment, Useful Life 15 years    
Other Noncurrent Liabilities [Member]      
Self Insurance Reserve and Coverage by Insurance, Noncurrent $ 6.9 $ 5.8