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Note 1 - Significant Accounting Policies (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2016
May 02, 2015
May 03, 2014
Other Noncurrent Liabilities [Member]      
Self Insurance Reserve and Coverage by Insurance, Noncurrent $ 5.8 $ 5.9  
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    
Shipping, Handling and Transportation Costs $ 44.6 $ 44.4 $ 44.4
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements 219,000 206,000 188,000
Self Insurance Reserve, Noncurrent, Covered by Insurance $ 4.8 $ 4.7  
Inventory, Finished Goods, Gross 29.1 24.9  
Inventory, Raw Materials, Gross 18.8 18.0  
Marketing Expense $ 38.8 $ 42.4 $ 50.2