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Shareholders' Equity and Share-Based Compensation (Details Textual)
$ / shares in Units, $ in Thousands
 12 Months Ended
Apr. 27, 2024
USD ($)
$ / shares
shares
Apr. 29, 2023
USD ($)
shares
Apr. 30, 2022
USD ($)
shares
May 01, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, shares authorized and undesignated (in shares) 120,000,000      
Common stock, shares authorized (in shares) 115,000,000 115,000,000    
Preferred stock, shares authorized (in shares) 50,000 50,000    
Common stock, shares undesignated (in shares) 4,950,000      
Number of preferred share purchase right 1      
Common share rights exercise, period 10 days      
Sale of stock, percentage of ownership after transaction 20.00%      
Common share rights exercise, period 10 years      
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares) 1,631,000      
Share-based payment arrangement, nonvested award, cost not yet recognized, amount | $ $ 1,977      
Share-based payment arrangement, nonvested award, cost not yet recognized 2 years 7 months 6 days      
Exercisable shares (in shares) 1,034,000      
Option, exercise price range, upper range limit (in dollars per share) | $ / shares $ 9.29      
Exercised, aggregate intrinsic value | $ $ 708 $ 7 $ 2  
Fair value of stock potions vested | $ $ 453 $ 467 $ 465  
Stock issued during period, shares, employee stock purchase plans (in shares) 355,000 424,000 310,000  
Share-based compensation expense | $ $ 2,827      
Proceeds from stock options exercised | $ 1,302 $ 21 $ 8  
Share-based payment arrangement, expense, tax benefit | $ $ 22 23 47  
Employee Stock Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, award vesting period 1 year      
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares) 5,500,000      
Maximum employee subscription rate 15.00%      
Discount from market price, offering date 85.00%      
Common stock, capital shares reserved for future issuance (in shares) 1,220,000      
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, expiration period       10 years
Share-based compensation arrangement by share-based payment award, award vesting period       5 years
Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payment arrangement, nonvested award, cost not yet recognized 2 years 9 months 3 days      
Fair value of restricted stock vested | $ $ 1,536 $ 1,160 $ 1,203  
Restricted stock | Independent Directors        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, award vesting period       1 year
Restricted stock | Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation arrangement by share-based payment award, award vesting period       5 years
In money options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercisable shares (in shares) 593      
Preferred Share Purchase Right        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of securities called by each warrant or right (in shares) 0.001      
Initial exercise price (in dollars per share) | $ / shares $ 20