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Shareholders' Equity - Summary of Stock Option Activity and Related Information for Stock Options Granted, Options Outstanding and Exercisable (Details) - Stock Options
 12 Months Ended
Apr. 28, 2018
$ / shares
shares
2010 Stock Plan | $37.01  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) | shares 72,000
Options outstanding - exercise price (in dollars per share) | $ / shares $ 37.01
Options outstanding - avg remaining life 6 years 3 months 12 days
Options exercisable (in shares) | shares 72,000
Options exercisable - exercise price (in dollars per share) | $ / shares $ 37.01
Options exercisable - avg. remaining life 6 years 3 months 12 days
2007 Stock Plan  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) | shares 42,168
Options outstanding - exercise price (in dollars per share) | $ / shares $ 33.87
Options exercisable (in shares) | shares 42,168
Options exercisable - exercise price (in dollars per share) | $ / shares $ 33.87
2007 Stock Plan | $10.55  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) | shares 5,000
Options outstanding - exercise price (in dollars per share) | $ / shares $ 10.55
Options outstanding - avg remaining life 2 years 2 months 27 days
Options exercisable (in shares) | shares 5,000
Options exercisable - exercise price (in dollars per share) | $ / shares $ 10.55
Options exercisable - avg. remaining life 2 years 2 months 27 days
2007 Stock Plan | $17.27  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (in shares) | shares 37,168
Options outstanding - exercise price (in dollars per share) | $ / shares $ 37.01
Options outstanding - avg remaining life 6 years 3 months 12 days
Options exercisable (in shares) | shares 37,168
Options exercisable - exercise price (in dollars per share) | $ / shares $ 37.01
Options exercisable - avg. remaining life 6 years 3 months 12 days