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Note 1 - Significant Accounting Policies (Details Textual)
$ in Thousands
12 Months Ended
Apr. 28, 2018
USD ($)
shares
Apr. 29, 2017
USD ($)
shares
Apr. 30, 2016
USD ($)
shares
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements | shares 323,000 206,000 219,000
Self Insurance Reserve, Noncurrent, Covered by Insurance $ 5,000 $ 5,400  
Inventory, Finished Goods, Gross, Total 37,600 35,000  
Inventory, Raw Materials, Gross, Total 23,300 18,400  
Marketing Expense 49,700 44,900 $ 38,800
Income Tax Expense (Benefit), Total $ 55,715 55,780 31,507
Number of Operating Segments 1    
Shipping and Handling Costs $ 63,300 50,000 $ 44,600
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    
April 29, 2017 [Member] | Reclassification from Current Deferred Taxes to Noncurrent Deferred Taxes [Member]      
Prior Period Reclassification Adjustment $ 3,900    
Reclassification of Excess Tax Benefits from Financing to Operating Activities [Member] | April 29, 2017 [Member]      
Prior Period Reclassification Adjustment 495    
Reclassification of Excess Tax Benefits from Financing to Operating Activities [Member] | April 30, 2016 [Member]      
Prior Period Reclassification Adjustment (1,500)    
Accounting Standards Update 2016-09 [Member]      
Income Tax Expense (Benefit), Total (886)    
Other Noncurrent Liabilities [Member]      
Self Insurance Reserve and Coverage by Insurance, Noncurrent $ 6,500 $ 6,900