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Note K - Stock-based Compensation Plans (Details Textual) - USD ($)
12 Months Ended
Aug. 26, 2020
Aug. 29, 2018
Aug. 05, 2015
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Aug. 28, 2018
Share-based Payment Arrangement, Expense       $ 6,000,000.0 $ 4,700,000 $ 3,700,000  
Share-based Payment Arrangement, Expense, after Tax       4,600,000 3,600,000 $ 2,800,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       $ 44,400,000 $ 7,700,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       30,000 225,000 145,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options Exercised Through Net Settlements (in shares)       32,500      
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)       13,761      
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)       7,354      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in shares)       276,400      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value       $ 25,000,000.0      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term (Year)       5 years 7 months 6 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)       $ 60.26      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)       245,000      
Share-based Payment Arrangement, Option [Member]              
Share-based Payment Arrangement, Expense       $ 3,900,000 $ 3,600,000 $ 2,700,000  
Share-based Payment Arrangement, Expense, after Tax       3,000,000.0 2,900,000 2,000,000.0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value       2,000,000.0 9,300,000 3,000,000.0  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 4,800,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       1 year 9 months 18 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) 200,000 200,000 300,000        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 2,200,000 2,000,000 1,800,000        
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 1,100,000 1,000,000.0  
Share-based Payment Arrangement, Expense, after Tax       878,000 839,000 760,000  
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       $ 5,900,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       5 years 3 months 18 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value       $ 9,900,000 $ 9,200,000 $ 8,300,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       7,690 12,328 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)       $ 98.43 $ 102.03 $ 53.30  
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)       2,000 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)       $ 65.95 $ 99.05    
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)       5,690 4,224    
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)       $ 109.84 $ 109.06    
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)       87,009