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Shareholders' Equity - Summary of Stock Option Activity and Related Information for Stock Options Granted (Details) - Stock Options - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Apr. 27, 2019
Apr. 28, 2018
Apr. 29, 2017
2010 Stock Plan      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding - beginning balance (in shares) 72,000 72,000 197,332
Awarded (in shares) 0 0 0
Exercised (in shares) 0 0 (125,332)
Cancelled (in shares) 0 0 0
Outstanding - ending balance (in shares) 72,000 72,000 72,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Wtd. Avg. Exercise Price, Outstanding - beginning balance (in dollars per share) $ 37.01 $ 37.01 $ 24.55
Wtd. Avg. Exercise Price, Awarded (in dollars per share) 0.00 0.00 0.00
Wtd. Avg. Exercise Price, Exercised (in dollars per share) 0.00 0.00 17.40
Wtd. Avg. Exercise Price, Cancelled (in dollars per share) 0.00 0.00 0.00
Wtd. Avg. Exercise Price, Outstanding - ending balance (in dollars per share) $ 37.01 $ 37.01 $ 37.01
Weighted-average life of outstanding options 5 years 2 months 12 days 6 years 3 months 18 days 7 years 3 months 18 days
Intrinsic value of outstanding options $ 0.0 $ 0.3 $ 0.0
2007 Stock Plan      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding - beginning balance (in shares) 42,168 57,169 79,666
Awarded (in shares) 0 0 0
Exercised (in shares) 0 (13,333) (22,497)
Cancelled (in shares) (7,500) (1,668) 0
Outstanding - ending balance (in shares) 34,668 42,168 57,169
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Wtd. Avg. Exercise Price, Outstanding - beginning balance (in dollars per share) $ 33.87 $ 31.82 $ 28.91
Wtd. Avg. Exercise Price, Awarded (in dollars per share) 0.00 0.00 0.00
Wtd. Avg. Exercise Price, Exercised (in dollars per share) 0.00 24.67 21.52
Wtd. Avg. Exercise Price, Cancelled (in dollars per share) 37.01 37.01 0.00
Wtd. Avg. Exercise Price, Outstanding - ending balance (in dollars per share) $ 33.20 $ 33.87 $ 31.82
Weighted-average life of outstanding options 4 years 7 months 6 days 5 years 9 months 18 days 6 years 9 months 18 days
Intrinsic value of outstanding options $ 0.1 $ 0.3 $ 0.7