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Note I - Stock-based Compensation Plans (Details Textual) - USD ($)
6 Months Ended
Aug. 30, 2022
Aug. 26, 2020
Aug. 29, 2018
Aug. 05, 2015
Oct. 31, 2022
Oct. 31, 2021
Aug. 28, 2018
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)         137,500 30,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value         $ 5,000,000.0 $ 2,100,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value         $ 5,100,000 24,200,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in shares)         268,400    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value         $ 2,900,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term (Year)         5 years 8 months 12 days    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price (in dollars per share)         $ 77.40    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)         77,500    
Share-Based Payment Arrangement, Option [Member]              
Share-Based Payment Arrangement, Expense         $ 2,200,000 3,400,000  
Share-Based Payment Arrangement, Expense, after Tax         1,700,000 2,600,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         $ 5,200,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         1 year 4 months 24 days    
Restated Option Plan [Member]              
Share-Based Payment Arrangement, Expense         $ 2,800,000 3,900,000  
Share-Based Payment Arrangement, Expense, after Tax         2,100,000 3,000,000.0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) 185,000 200,000 200,000 300,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 2,385,000 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         548,000 509,000  
Share-Based Payment Arrangement, Expense, after Tax         418,000 $ 390,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)     450,000       100,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         $ 6,200,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)         172,461    
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)         $ 60.87    
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)         27,132 4,500  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)         70,566    
Stock Incentive Plan [Member] | Restricted Stock [Member]              
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         4 years 4 months 24 days