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Stock-Based Awards (Details) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended
Jul. 26, 2014
Jul. 27, 2013
Jul. 28, 2012
Jul. 25, 2014
Jul. 26, 2014
Stock Options
Jul. 26, 2014
Stock Options
Jul. 26, 2014
Restricted Share Units (RSUs)
Jul. 26, 2014
Restricted Share Units (RSUs)
Jul. 27, 2013
Restricted Share Units (RSUs)
Jul. 28, 2012
Restricted Share Units (RSUs)
Jul. 25, 2014
Restricted Share Units (RSUs)
Jul. 26, 2014
Performance Restricted Share Units
Oct. 26, 2013
Performance Restricted Share Units
Jul. 26, 2014
Performance Restricted Share Units
Jul. 27, 2013
Performance Restricted Share Units
Jul. 28, 2012
Performance Restricted Share Units
Jul. 26, 2014
Supplemental Shares
Performance Restricted Share Units
Jul. 26, 2014
Target Shares
Performance Restricted Share Units
Stock Options, Outstanding [Roll Forward]                                    
Outstanding beginning period           2,769,132                        
Granted           89,956                        
Options Exercised           (803,796)                        
Forfeited or canceled           (10,399)                        
Outstanding ending period         2,044,893 2,044,893                        
Exercisable options beginning period         1,575,300 1,575,300                        
Stock Options, Outstanding, Weighted Average Exercise Price [Roll Forward]                                    
Outstanding beginning period           $ 18.27                        
Granted           $ 27.50                        
Options Exercised           $ 18.12                        
Forfeited or canceled           $ 27.00                        
Outstanding ending period         $ 18.68 $ 18.68                        
Exercisable options beginning period         $ 18.81 $ 18.81                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]                                    
Outstanding weighted average remaining contractual life 4 years 9 months                                  
Exercisable weighted average remaining contractual life 3 years 10 months 24 days                                  
Outstanding aggregate intrinsic value $ 23,545,000                                  
Exercisable aggregate intrinsic value 18,566,000                                  
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding [Roll Forward]                                    
Outstanding beginning period               463,318         1,315,138 1,315,138       749,751
Granted               101,615           429,485     56,020  
Share Units Vested               (158,441)           (265,025)        
Forfeited or cancelled               (7,561)           (289,414)        
Outstanding ending period             398,931.000 398,931.000 463,318     1,190,184.000   1,190,184.000 1,315,138   440,433 749,751
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value [Roll Forward]                                    
Outstanding beginning period               $ 17.78         $ 18.44 $ 18.44        
Granted               $ 27.54 $ 18.52 $ 19.49       $ 27.66 $ 18.08 $ 19.47    
Share Units Vested               $ 16.53           $ 18.35        
Forfeited or cancelled               $ 19.27           $ 18.64        
Outstanding ending period             $ 20.61 $ 20.61 $ 17.78     $ 21.73   $ 21.73 $ 18.44      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]                                    
Aggregate intrinsic value             11,509,000 11,509,000       34,337,000   34,337,000        
Options exercises and stock vesting 7,100,000 3,400,000 2,800,000                              
Unrecognized compensation expense related to stock options         3,500,000 3,500,000                        
Unrecognized compensation expense related to RSUs             6,500,000 6,500,000       11,300,000   11,300,000        
Total compensation cost not yet recognized, period for recognition         2 years 2 months 13 days   2 years 7 months 7 days         1 year 6 months            
Compensation expense                       3,500,000   3,500,000        
Share price       $ 28.85             $ 28.85              
Total intrinsic value of stock options exercised 8,400,000 6,000,000 6,400,000                              
Cash from exercise of stock options 14,600,000 5,300,000 6,500,000                              
RSUs outstanding                       373,465            
Forfeited or cancelled                         265,000          
Total fair value of restricted share units vested               $ 11,700,000 $ 4,200,000 $ 1,900,000                
Share-based Compensation by Share-based Payment Award, Equity Awards Other than Options, Target Shares Expected to be Canceled                           48,275        
Share-based Compensation by Share-based Payment Award, Equity Awards Other than Options, Supplemental Shares Expected to be Canceled                           248,909