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Note 9 - Stock-based Compensation (Details Textual) - USD ($)
12 Months Ended
Apr. 27, 2019
Apr. 28, 2018
Apr. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 9,000 500 0
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 8 years 8 years  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 21.70% 23.80%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 2.60% 2.40%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 1.60% 1.60%  
Share-based Payment Arrangement, Expense $ 251,000 $ 161,000 $ 208,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value 127,000 140,000 362,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 2,200,000 3,000,000 1,500,000
Proceeds from Stock Options Exercised 456,000 560,000 365,000
Share-based Payment Arrangement, Expense, Tax Benefit $ 443,000 $ 886,000 $ 495,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 63.71    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 591,000,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 4 years 219 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3 years 109 days 4 years 146 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value $ 14,900,000 $ 27,300,000  
Employee Stock Ownership Plan (ESOP), Shares in ESOP, Total 1,536,000    
Employee Stock Purchase Plan, Eligibility Requirement, Length of Employment 2 years    
Stock Issued During Period, Shares, Employee Stock Purchase Plans 0    
Omnibus Plan [Member]      
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Authorized Per Individual 1,680,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years    
Omnibus Plan [Member] | Stock Options or Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 4,800,000    
Omnibus Plan [Member] | SARS Dividend Equivalents and Other Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 4,800,000    
Special Stock Option Plan [Member] | Determined by Board of Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,800,000    
Special Stock Option Plan [Member] | Determined By Chairman Member      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 50,000    
KEEP Program [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 240,000    
Share Based Compensation Arrangement by Share Based Payment Award Number of Shares Authorized Per Individual 6,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 6 years    
Share Based Compensation Arrangement by Share Based Payment Award Percentage of Purchased Shares Matched 50.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants, Period 2 years    
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent 60.00%