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Shareholders' Equity and Share-Based Compensation - Narrative (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 12 Months Ended
Apr. 26, 2014
Apr. 27, 2013
Apr. 28, 2012
Apr. 26, 2014
Stock Options
Apr. 26, 2014
Restricted Stock
Apr. 27, 2013
Restricted Stock
Apr. 28, 2012
Restricted Stock
Apr. 26, 2014
Restricted Stock and Restricted Stock Units
Apr. 26, 2014
In The Money Options
Apr. 26, 2014
Employee Stock
Apr. 26, 2014
Independent Directors
Stock Options
May 01, 2010
Independent Directors
Stock Options
Apr. 26, 2014
Independent Directors
Restricted Stock
Apr. 26, 2014
Common Stock
Apr. 26, 2014
Undesignated Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares authorized 120,000,000                         115,000,000 5,000,000
Common purchase right per common stock 1                            
Conversion ratio for rights to common stock 0.10                            
Share price $ 100                            
Days following ownership announcement option one 10 days                            
Percentage of ownership 15.00%                            
Days following ownership announcement, option two 10 days                            
Award life       10 years             7 years        
Vesting period       5 years 5 years         1 year 1 year 3 years 1 year    
Shares available for grant 439,000                 2,500,000          
Unrecognized compensation costs               $ 2,333              
Weighted-average period for unrecognized costs 2 years 11 months 5 days       3 years 1 month 11 days                    
Fair value         804 666 511                
Exercise price (usd per share)                 $ 13.06            
Exercisable at end of year, Shares 2,077,000               1,091,000            
Exercised, aggregate intrinsic value 1,534 562 624                        
Fair value of vested options 1,541 1,898 2,497                        
Requisite service period                   6 months          
Employee maximum contribution percentage                   15.00%          
Percentage of purchase price at the lower of the fair market value                   85.00%          
Purchase discount percentage                   15.00%          
Stock issued for ESPP 195,000 214,000 160,000                        
Shares reserved for future issuance                   990,000          
Nonvested unrecognized compensation expense 5,034                            
Proceeds from exercise of stock options 4,954 1,316 547                        
Tax benefit from share based payments $ (126) $ 346 $ 325