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Stock-Based Compensation - Performance Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Apr. 30, 2016
Stock-Based Compensation      
Equity based compensation expenses $ 9,879 $ 10,551 $ 9,647
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 $ 2,900    
Period for recognition of unrecognized compensation costs 1 year 4 months 24 days    
Equity based compensation expenses $ 2,394 $ 3,068 3,376
Number of Shares      
Non-vested at beginning of period (in shares) 559    
Granted (in shares) 356    
Vested (in shares) (89)    
Canceled (in shares) (285)    
Non-vested at end of period (in shares) 541 559  
Weighted Average Grant Date Fair Value      
Non-vested at beginning of period (in dollars per share) $ 24.87    
Granted (in dollars per share/unit) 25.93    
Vested (in dollars per share) 22.91    
Canceled (in dollars per share) 25.54    
Non-vested at end of period (in dollars per share) $ 25.52 $ 24.87  
Performance-Based Shares | Fiscal 2014 Grant      
Stock-Based Compensation      
Equity based compensation expenses     926
Performance-Based Shares | Fiscal 2015 Grant      
Stock-Based Compensation      
Equity based compensation expenses   $ 675 840
Performance-Based Shares | Fiscal 2016 Grant      
Stock-Based Compensation      
Equity based compensation expenses $ 1,052 1,284 $ 1,610
Performance-Based Shares | Fiscal 2017 Grant      
Stock-Based Compensation      
Equity based compensation expenses 455 $ 1,109  
Performance-Based Shares | Fiscal 2018 Grant      
Stock-Based Compensation      
Equity based compensation expenses $ 887    
Performance-Based Shares, vesting based on performance goals | Fiscal 2016 Grant      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share/unit)     $ 25.73
Performance-Based Shares, vesting based on performance goals | Fiscal 2017 Grant      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share/unit)   $ 24.79  
Performance-Based Shares, vesting based on performance goals | Fiscal 2018 Grant      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share/unit) $ 25.93    
Performance Based Shares, vesting based on market conditions | Fiscal 2016 Grant      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share/unit)     $ 34.40
Performance Based Shares, vesting based on market conditions | Fiscal 2017 Grant      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share/unit)   $ 33.32  
Performance Based Shares, vesting based on market conditions | Fiscal 2018 Grant      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share/unit) $ 36.24    
Performance-Based Units      
Stock-Based Compensation      
Equity based compensation expenses     $ 0