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Employee 401(k) Savings and Deferred Compensation Plans - Narrative (Details) - USD ($)
 12 Months Ended
Apr. 27, 2019
Apr. 28, 2018
Apr. 29, 2017
Retirement Benefits [Abstract]      
Employer matching contribution, percent 3.00%    
Employer 401(k) contribution $ 1,500,000 $ 1,400,000 $ 1,400,000
Deferred Compensation Plan, maximum deferral percentage, annual base salary 75.00%    
Deferred Compensation Plan, maximum deferral percentage, annual cash incentive 100.00%    
Deferred Compensation Plan, aggregate minimum deferral $ 3,000    
Deferred Compensation Plan, minimum deferral period 3 years    
Deferred Compensation Plan, vesting percentage 100.00%    
Deferred Compensation Plan, employer discretionary contribution amount $ 0 0 $ 0
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Deferred compensation 6,100,000 6,700,000  
Asset Held in Trust      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Cash surrender value of life insurance 6,900,000 6,700,000  
Key Individual Life Insurance      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Cash surrender value of life insurance $ 8,600,000 $ 8,200,000