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Stock-Based Compensation - Restricted Stock and RSUs (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Apr. 30, 2022
Apr. 24, 2021
Apr. 25, 2020
Maximum      
Stock-Based Compensation      
Vesting period 4 years    
Restricted Stock      
Shares      
Granted (in shares) 121,963    
Restricted Stock | Employees      
Stock-Based Compensation      
Percentage vesting each year from date of grant 25.00%    
Period from grant date for first vesting 1 year    
Vesting period 4 years    
Unrecognized compensation cost $ 6.8    
Period for recognition of unrecognized compensation costs 1 year 8 months 12 days    
Shares      
Non-vested at beginning of period (in shares) 320,000    
Granted (in shares) 122,000    
Vested (in shares) (120,000)    
Canceled (in shares) (35,000)    
Non-vested at end of period (in shares) 287,000 320,000  
Weighted Average Grant Date Fair Value      
Non-vested at beginning of period (in dollars per share) $ 30.14    
Granted (in dollars per share) 38.27    
Vested (in dollars per share) 30.37    
Canceled (in dollars per share) 30.48    
Non-vested at end of period (in dollars per share) 33.45 $ 30.14  
Restricted Stock | Non-Employee Directors      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share) $ 35.34 $ 32.08 $ 31.77
Restricted Stock | Non-Employee Directors | Maximum      
Shares      
Granted (in shares) 100,000 100,000 100,000