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Stock-Based Compensation - Performance Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Apr. 29, 2017
Apr. 30, 2016
Apr. 25, 2015
Stock-Based Compensation      
Equity based compensation expenses $ 10,551 $ 9,647 $ 11,377
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      
Equity based compensation expenses $ 3,068 $ 3,376 2,245
Unrecognized compensation cost $ 4,100    
Period for recognition of unrecognized compensation costs 1 year 3 months 18 days    
Number of Shares      
Non-vested at beginning of period (in shares) 612    
Granted (in shares) 361    
Vested (in shares) (159)    
Canceled (in shares) (255)    
Non-vested at end of period (in shares) 559 612  
Weighted Average Grant Date Fair Value      
Non-vested at beginning of period (in dollars per share) $ 23.10    
Granted (in dollars per share/unit) 24.79    
Vested (in dollars per share) 18.58    
Canceled (in dollars per share) 24.34    
Non-vested at end of period (in dollars per share) $ 24.87 $ 23.10  
Performance-Based Shares | Fiscal 2013 Grant      
Stock-Based Compensation      
Equity based compensation expenses     568
Performance-Based Shares | Fiscal 2014 Grant      
Stock-Based Compensation      
Equity based compensation expenses   $ 926 769
Performance-Based Shares | Fiscal 2015 Grant      
Stock-Based Compensation      
Equity based compensation expenses $ 675 840 $ 908
Performance-Based Shares | Fiscal 2016 Grant      
Stock-Based Compensation      
Equity based compensation expenses 1,284 $ 1,610  
Performance-Based Shares | Fiscal 2017 Grant      
Stock-Based Compensation      
Equity based compensation expenses $ 1,109    
Performance-Based Shares, vesting based on performance goals | Fiscal 2015 Grant      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share/unit)     $ 22.91
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 market conditions | Fiscal 2015 Grant      
Weighted Average Grant Date Fair Value      
Granted (in dollars per share/unit)     $ 29.64
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 Units      
Stock-Based Compensation      
Equity based compensation expenses   $ 0 $ 2,000