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Stock-based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 08, 2018
Jun. 29, 2018
Dec. 01, 2017
Apr. 27, 2019
Apr. 28, 2018
Apr. 29, 2017
Apr. 25, 2015
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expense recognized       $ 19,685 $ 18,400 $ 17,710    
After-tax stock-based compensation expense       15,588 $ 13,037 11,910    
Compensation cost before income taxes related to non-vested awards yet to be recognized       $ 27,998        
Total compensation cost expected to be recognized over a weighted average period       1 year 7 months 6 days        
Number of shares outstanding (in shares)       1,556,000 1,206,000      
Granted (in usd per share)       $ 23.40        
Weighted average remaining contractual lives of options outstanding       7 years 6 months        
Weighted average remaining contractual lives of options exercisable       5 years 8 months 12 days        
Stock options exercised, intrinsic value       $ 2 $ 88 266    
Stock options exercised, cash received       13 324 958    
Stock options exercised, tax benefit       $ 0 $ 3 $ 36    
First Anniversary                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting, percentage     50.00%          
Second Anniversary                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting, percentage     50.00%          
Non-Statutory Stock Options | First Anniversary                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting, percentage   33.00%            
Non-Statutory Stock Options | Second Anniversary                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting, percentage   33.00%            
Non-Statutory Stock Options | Third Anniversary                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting, percentage   33.00%            
Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of performance units vested       111,000        
Shares granted (in shares)       773,000        
Restricted Stock Units | First Anniversary                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting, percentage   50.00%            
Restricted Stock Units | Second Anniversary                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting, percentage   50.00%            
Performance Unit Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of performance units vested       0 0 0    
Shares granted (in shares)       142,000        
Chief Executive Officer | Non-Statutory Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares issued (in share)   99,000            
Granted (in usd per share)   $ 22.67            
Expiration period   10 years            
Chief Executive Officer | Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares issued (in share)   31,000 56,000          
2015 Omnibus Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares of common stock reserved for issuance (in shares)               11,500,000
Equity Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares available for awards (in shares)       7,556,000        
Prior Equity Incentive Plans                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares outstanding (in shares)       796,000        
Employee Stock Option Plans                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expiration period       10 years        
Employee Stock Option Plans | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period       3 years        
Employee Stock Option Plans | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period       5 years        
Restricted Stock And Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Total fair value of restricted stock awards vested in period       $ 5,683 $ 6,939 $ 8,528    
Restricted Stock And Restricted Stock Units | First Anniversary                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Employee stock vesting period       3 years        
Restricted Stock And Restricted Stock Units | Second Anniversary                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Employee stock vesting period       5 years        
Restricted Stock And Restricted Stock Units | Third Anniversary                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Employee stock vesting period       7 years        
Restricted Stock And Restricted Stock Units | Management                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Employee stock vesting period       3 years        
Restricted Stock And Restricted Stock Units | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Minimum restriction period for restricted stock and restricted stock units       1 year        
Performance Unit Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Employee stock vesting period         3 years 3 years 3 years  
Number of performance units vested       0        
Performance Unit Awards | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percentage of shares to be received at vesting       0.00%        
Performance Unit Awards | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percentage of shares to be received at vesting       200.00%        
Employee Stock Purchase Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares of common stock reserved for issuance (in shares)       6,750,000        
Number of shares available for awards (in shares)       289,000        
Percentage of fair market value of the common stock       85.00%        
Capital Accumulation Plan (CAP)                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares of common stock reserved for issuance (in shares)       6,000,000        
Number of shares available for awards (in shares)       235,000        
Minimum restriction period for restricted stock and restricted stock units       3 years        
Percentage of fair market value of the common stock       75.00%        
Number of shares reduced (in shares) 1,500,000              
Shares granted (in shares)       0