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Shareholders' Equity - Summary of Combined Stock Option Activity and Related Information for Stock Options Granted (Details) - Share-based Payment Arrangement, Option - 2010 Plan and 2007 Plan - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
May 01, 2021
May 02, 2020
Apr. 27, 2019
Apr. 28, 2018
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding [Roll Forward]        
Outstanding - beginning balance (in shares) 106,668 106,668 114,168  
Exercised (in shares) (24,500) 0 0  
Cancelled (in shares) (9,168) 0 (7,500)  
Outstanding - ending balance (in shares) 73,000 106,668 106,668 114,168
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]        
Weighted average exercise price, Outstanding - beginning balance (in dollars per share) $ 35.76 $ 35.76 $ 35.85  
Weighted average exercise price, Exercised (in dollars per share) 31.61 0 0  
Weighted average exercise price, Cancelled (in dollars per share) 37.01 0 37.01  
Weighted average exercise price, Outstanding - ending balance (in dollars per share) $ 37.01 $ 35.76 $ 35.76 $ 35.85
Weighted-average life of outstanding options 3 years 2 months 12 days 4 years 5 years 6 years 1 month 6 days
Intrinsic value of outstanding options $ 0.6 $ 0.1 $ 0.1 $ 0.6
Weighted-average life of outstanding options 3 years 2 months 12 days 4 years 5 years 6 years 1 month 6 days
Intrinsic value of outstanding options $ 0.6 $ 0.1 $ 0.1 $ 0.6