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Stock-Based Compensation - Performance Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Apr. 25, 2020
Apr. 27, 2019
Apr. 28, 2018
Weighted Average Grant Date Fair Value      
Equity based compensation expenses $ 7,389 $ 11,320 $ 9,879
Performance based units      
Stock-Based Compensation      
Percentage of payout dependent on financial performance 80.00%    
Percentage of payout dependent on total shareholder return 20.00%    
Performance based units | Minimum      
Stock-Based Compensation      
Performance award opportunity as a percentage of target award 50.00%    
Performance based units | Maximum      
Stock-Based Compensation      
Performance award opportunity as a percentage of target award 200.00%    
Performance awards, performance period 3 years    
Performance-Based Shares      
Number of Shares      
Non-vested at beginning of period (in shares) 523    
Granted (in shares) 311    
Vested (in shares) (87)    
Canceled (in shares) (213)    
Non-vested at end of period (in shares) 534 523  
Weighted Average Grant Date Fair Value      
Non-vested at beginning of period (in dollars per share) $ 28.43    
Granted (in dollars per share) 28.68    
Vested (in dollars per share) 24.79    
Canceled (in dollars per share) 28.45    
Non-vested at end of period (in dollars per share) $ 29.21 $ 28.43  
Unrecognized compensation cost $ 3,700    
Period for recognition of unrecognized compensation costs 1 year 3 months 18 days    
Equity based compensation expenses $ 2,558 $ 4,222 2,394
Performance-Based Shares | Fiscal 2016 Grant      
Weighted Average Grant Date Fair Value      
Equity based compensation expenses     1,052
Performance-Based Shares | Fiscal 2017 Grant      
Weighted Average Grant Date Fair Value      
Equity based compensation expenses   1,044 455
Performance-Based Shares | Fiscal 2018 Grant      
Weighted Average Grant Date Fair Value      
Equity based compensation expenses 611 1,402 $ 887
Performance-Based Shares | Fiscal 2019 Grant      
Weighted Average Grant Date Fair Value      
Equity based compensation expenses 996 $ 1,776  
Performance-Based Shares | Fiscal 2020 Grant      
Weighted Average Grant Date Fair Value      
Equity based compensation expenses $ 951    
Performance-Based Shares, vesting based on performance goals | Fiscal 2020 Grant      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share) $ 28.68 $ 31.71 $ 25.93
Performance Based Shares, vesting based on market conditions | Fiscal 2020 Grant      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share) $ 38.75 $ 46.39 $ 36.24