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Stock-Based Awards (Details) (USD $)
3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Oct. 27, 2012
Stock Options
Oct. 27, 2012
Stock Options
Oct. 27, 2012
Restricted Share Units (RSUs)
Oct. 27, 2012
Restricted Share Units (RSUs)
Oct. 27, 2012
Performance Restricted Share Units
Oct. 28, 2012
Performance Restricted Share Units
Oct. 27, 2012
Performance Restricted Share Units
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]                  
Stock-based compensation $ 2,266,000 $ 1,326,000              
Tax benefit recognized (765,000) (372,000)              
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]                  
Unrecognized compensation expense related to stock options     6,400,000 6,400,000          
Unrecognized compensation expense related to RSUs         $ 2,200,000 $ 2,200,000 $ 10,600,000   $ 10,600,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     2 years 1 month 6 days   2 years 6 months   2 years 2 months 12 days    
Stock Options, Outstanding [Roll Forward]                  
Outstanding as of July 28,2012       3,298,747          
Granted       0          
Options Exercised       (21,230)          
Forfeited or cancelled       (98,095)          
Outstanding as of October 27,2012     3,179,422 3,179,422          
Exercisable options as of October 27, 2012     1,787,886 1,787,886          
Stock Options, Outstanding, Weighted Average Exercise Price [Roll Forward]                  
Outstanding as of July 28, 2012       $ 17.08          
Granted       $ 0.00          
Options Exercised       $ 7.81          
Forfeited or cancelled       $ 24.65          
Outstanding as of October 27, 2012     $ 16.91 $ 16.91          
Exercisable options as of October 27, 2012     $ 20.84 $ 20.84          
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding [Roll Forward]                  
Outsanding as of July 28, 2012           222,760     774,264
Granted           1,280     101,568
Share Units Vested           (1,280)     (36,341)
Forfeited or cancelled           (3,000)     (44,011)
Outsanding as of October 27, 2012         219,760 219,760 795,480   795,480
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value [Roll Forward]                  
Outstanding as of July 28, 2012           $ 14.49     $ 18.76
Granted           $ 17.80     $ 13.85
Share Units Vested           $ 17.80     $ 14.53
Forfeited or cancelled           $ 7.98     $ 15.41
Outstanding as of October 27, 2012         $ 14.58 $ 14.58 $ 18.51   $ 18.51
Share-based Compensation by Share-based Payment Award, Equity Awards Other than Options, Target Amount               397,740  
Performance RSUs to be cancelled for performance criteria not met               101,000