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Note 1 - Significant Accounting Policies (Details Textual)
$ in Thousands
12 Months Ended
Apr. 27, 2019
USD ($)
shares
Apr. 28, 2018
USD ($)
shares
Apr. 29, 2017
USD ($)
shares
Apr. 30, 2016
USD ($)
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements | shares 284,000 323,000 206,000  
Self Insurance Reserve and Coverage by Insurance, Noncurrent $ 5,700 $ 6,500    
Self Insurance Reserve, Noncurrent, Covered by Insurance 4,300 5,000    
Inventory, Finished Goods, Gross, Total 48,700 37,600    
Inventory, Raw Materials, Gross, Total 22,000 23,300    
Marketing Expense 55,300 49,700 $ 44,900  
Shipping and Handling Costs 72,400 63,300 50,000  
Net Cash Provided by (Used in) Financing Activities, Total (134,791) (69,318) (69,485)  
Deferred Tax Liabilities, Net, Noncurrent $ 15,987 $ 14,502    
Number of Operating Segments 1      
Accounting Standards Update 2016-09 [Member]        
Net Cash Provided by (Used in) Financing Activities, Total     (495) $ (1,500)
Accounting Standards Update 2015-17 [Member]        
Deferred Tax Liabilities, Net, Noncurrent     $ 3,900  
Building and Building Improvements [Member] | Minimum [Member]        
Property, Plant and Equipment, Useful Life 5 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