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Stock-Based Compensation, Restricted Shares and RSUs (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jul. 26, 2014
Restricted Stock
Oct. 25, 2014
Restricted Stock
Oct. 25, 2014
Restricted Stock Units (RSUs)
Employees
Oct. 25, 2014
Restricted Stock Units (RSUs)
Non-Employee Directors
Oct. 25, 2014
Restricted Stock Units (RSUs)
Non-Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)   102,811   33,250 33,000
Fair value on date of grant (in dollars per share) $ 23.63     $ 21.81  
Fair value (in dollars per share)     $ 21.83    
Award common share equivalent (in shares)     1    
Percentage vesting each year from date of grant   25.00% 25.00%    
Period from grant date for first vesting   1 year 1 year    
Vesting period   4 years 4 years