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Stock-Based Compensation - Performance Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Apr. 30, 2016
Apr. 25, 2015
Apr. 26, 2014
Stock-Based Compensation      
Equity based compensation expenses $ 9,647 $ 11,377 $ 14,475
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 $ 3,376 2,245 5,458
Unrecognized compensation cost $ 4,600    
Period for recognition of unrecognized compensation costs 1 year 4 months 24 days    
Performance-Based Shares | Fiscal 2012 Grant      
Stock-Based Compensation      
Equity based compensation expenses     3,603
Performance-Based Shares | Fiscal 2013 Grant      
Stock-Based Compensation      
Equity based compensation expenses   568 $ 849
Performance-Based Shares | Fiscal 2014 Grant      
Stock-Based Compensation      
Number of shares or units granted     191
Number of shares or units earned 159    
Equity based compensation expenses $ 926 $ 769 $ 1,006
Performance-Based Shares | Fiscal 2015 Grant      
Stock-Based Compensation      
Number of shares or units granted   192  
Number of shares or units earned 64    
Equity based compensation expenses $ 840 $ 908  
Performance-Based Shares | Fiscal 2016 Grant      
Stock-Based Compensation      
Number of shares or units granted 182    
Number of shares or units earned 80    
Equity based compensation expenses $ 1,610    
Performance-Based Shares | Vesting Based on Performance | Fiscal 2014 Grant      
Stock-Based Compensation      
Fair value on date of grant (in dollars per share)     $ 18.58
Performance-Based Shares | Vesting Based on Performance | Fiscal 2015 Grant      
Stock-Based Compensation      
Fair value on date of grant (in dollars per share)   $ 22.91  
Performance-Based Shares | Vesting Based on Performance | Fiscal 2016 Grant      
Stock-Based Compensation      
Fair value on date of grant (in dollars per share) $ 25.73    
Performance-Based Shares | Vesting Based on Market | Fiscal 2014 Grant      
Stock-Based Compensation      
Fair value on date of grant (in dollars per share)     $ 26.08
Performance-Based Shares | Vesting Based on Market | Fiscal 2015 Grant      
Stock-Based Compensation      
Fair value on date of grant (in dollars per share)   $ 29.64  
Performance-Based Shares | Vesting Based on Market | Fiscal 2016 Grant      
Stock-Based Compensation      
Fair value on date of grant (in dollars per share) $ 34.40    
Performance-Based Units      
Stock-Based Compensation      
Equity based compensation expenses $ 0 $ 2,000 $ 2,200
Performance-Based Units | Fiscal 2014 Grant      
Stock-Based Compensation      
Number of shares or units granted     35
Number of shares or units earned 24    
Performance-Based Units | Vesting Based on Performance | Fiscal 2014 Grant      
Stock-Based Compensation      
Fair value (in dollars per unit) $ 25.77    
Performance-Based Units | Vesting Based on Market | Fiscal 2014 Grant      
Stock-Based Compensation      
Fair value (in dollars per unit) $ 46.64