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Stock-Based Compensation - Performance Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Apr. 27, 2019
Apr. 28, 2018
Apr. 29, 2017
Stock-Based Compensation      
Equity based compensation expenses $ 11,320 $ 9,879 $ 10,551
Performance Awards      
Stock-Based Compensation      
Percentage of payout dependent on financial performance 80.00%    
Percentage of payout dependent on total shareholder return 20.00%    
Performance Awards | Minimum      
Stock-Based Compensation      
Performance award opportunity as a percentage of target award 50.00%    
Performance Awards | Maximum      
Stock-Based Compensation      
Performance award opportunity as a percentage of target award 200.00%    
Performance awards, performance period 3 years    
Performance-Based Shares      
Stock-Based Compensation      
Unrecognized compensation cost $ 5,300    
Period for recognition of unrecognized compensation costs 1 year 4 months 24 days    
Equity based compensation expenses $ 4,220 $ 2,394 3,068
Number of Shares      
Non-vested at beginning of period (in shares) 541    
Granted (in shares) 292    
Vested (in shares) (139)    
Canceled (in shares) (171)    
Non-vested at end of period (in shares) 523 541  
Weighted Average Grant Date Fair Value      
Non-vested at beginning of period (in dollars per share) $ 25.52    
Granted (in dollars per share) 31.71    
Vested (in dollars per share) 25.73    
Canceled (in dollars per share) 27.05    
Non-vested at end of period (in dollars per share) $ 28.43 $ 25.52  
Performance-Based Shares | Fiscal 2015 Grant      
Stock-Based Compensation      
Equity based compensation expenses     675
Performance-Based Shares | Fiscal 2016 Grant      
Stock-Based Compensation      
Equity based compensation expenses   $ 1,052 1,284
Performance-Based Shares | Fiscal 2017 Grant      
Stock-Based Compensation      
Equity based compensation expenses $ 1,044 455 $ 1,109
Performance-Based Shares | Fiscal 2018 Grant      
Stock-Based Compensation      
Equity based compensation expenses 1,402 $ 887  
Performance-Based Shares | Fiscal 2019 Grant      
Stock-Based Compensation      
Equity based compensation expenses $ 1,774    
Performance-Based Shares, vesting based on performance goals | Fiscal 2017 Grant      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share)     $ 24.79
Performance-Based Shares, vesting based on performance goals | Fiscal 2018 Grant      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share)   $ 25.93  
Performance-Based Shares, vesting based on performance goals | Fiscal 2019 Grant      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share) $ 31.71    
Performance Based Shares, vesting based on market conditions | Fiscal 2017 Grant      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share)     $ 33.32
Performance Based Shares, vesting based on market conditions | Fiscal 2018 Grant      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share)   $ 36.24  
Performance Based Shares, vesting based on market conditions | Fiscal 2019 Grant      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share) $ 46.39