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Note K - Stock-based Compensation Plans (Details Textual) - USD ($)
12 Months Ended 13 Months Ended
Aug. 26, 2020
Aug. 29, 2018
Aug. 05, 2015
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2022
Aug. 28, 2018
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value       $ 8,400,000 $ 44,400,000   $ 8,400,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       30,000 30,000 225,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value       $ 2,100,000 $ 2,000,000.0 $ 9,300,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options Exercised Through Net Settlements (in shares)             80,000  
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)             53,425  
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)             26,575  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in shares)       261,400     261,400  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value       $ 5,300,000     $ 5,300,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term (Year)             5 years 6 months  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price (in dollars per share)       $ 74.84     $ 74.84  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)       215,000     215,000  
Share-Based Payment Arrangement, Option [Member]                
Share-Based Payment Arrangement, Expense       $ 4,500,000 3,900,000 3,600,000    
Share-Based Payment Arrangement, Expense, after Tax       3,400,000 3,000,000.0 2,900,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 2,500,000     $ 2,500,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       10 months 24 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 Payment Arrangement, Expense       $ 5,500,000 6,000,000.0 4,700,000    
Share-Based Payment Arrangement, Expense, after Tax       4,200,000 4,600,000 3,600,000    
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       981,000 1,100,000 1,100,000    
Share-Based Payment Arrangement, Expense, after Tax       749,000 878,000 839,000    
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       $ 5,300,000     $ 5,300,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       4 years 6 months        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value       $ 10,100,000 $ 9,900,000 $ 9,200,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       11,287 7,690 12,328    
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)       $ 121.17 $ 98.43 $ 102.03    
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)       5,750 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)       $ 102.40 $ 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)       4,500 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)       $ 150.83 $ 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)       1,037   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)       $ 96.49   $ 97.97    
Stock Incentive Plan [Member] | Restricted Stock [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)       91,413     91,413