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Note K - Stock-based Compensation Plans (Details Textual) - USD ($)
12 Months Ended
Aug. 29, 2018
Aug. 05, 2015
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Aug. 28, 2018
Share-based Payment Arrangement, Expense     $ 4,700,000 $ 3,700,000 $ 1,600,000  
Share-based Payment Arrangement, Expense, after Tax     3,600,000 2,800,000 $ 1,100,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     $ 7,700,000 $ 29,900,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)     225,000 145,000 25,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options Exercised Through Net Settlements (in shares)     57,500      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Reduction in Shares Issued to Satisfy the Exercise Price and Applicable Withholding Taxes (in shares)     28,307      
Share-based Compensation Arrangement by Share-based Payment Award, Options Exercised Through Net Settlements, Net of Shares to Satisfy the Exercise Price and Applicable Withholding Taxes (in shares)     29,193      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in shares)     155,250      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value     $ 2,600,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term (Year)     3 years 255 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price (in dollars per share)     $ 36.38      
Share-based Payment Arrangement, Option [Member]            
Share-based Payment Arrangement, Expense     $ 3,600,000 $ 2,700,000 $ 1,200,000  
Share-based Payment Arrangement, Expense, after Tax     $ 2,900,000 2,000,000 773,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)     225,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value     $ 9,300,000 3,000,000 336,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 8,700,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     1 year 328 days      
Share-based Payment Arrangement, Option [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     3 years      
Share-based Payment Arrangement, Option [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     5 years      
Restated Option Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) 200,000 300,000        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 2,000,000 1,800,000        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)     75,000      
Restated Option Plan [Member] | Share-based Payment Arrangement, Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   10 years        
Stock Incentive Plan [Member]            
Share-based Payment Arrangement, Expense     $ 1,100,000 1,000,000 430,000  
Share-based Payment Arrangement, Expense, after Tax     839,000 760,000 288,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 450,000         350,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 6,300,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     6 years 109 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value     $ 9,200,000 $ 8,300,000 $ 8,200,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     12,328 3,000 166,500  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)     $ 102.03 $ 53.30 $ 45.86  
Stock Incentive Plan [Member] | First Issuance of Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     3,000   132,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)     $ 99.05   $ 48.70  
Stock Incentive Plan [Member] | Second Issuance of Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     4,224   34,500  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)     $ 109.06   $ 35  
Stock Incentive Plan [Member] | Third Issuance of Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     5,104      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)     $ 97.97      
Stock Incentive Plan [Member] | Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       3,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)       $ 53.30    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)     94,199