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Employee Benefit Plans - (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jan. 29, 2011
Apr. 26, 2014
Apr. 27, 2013
Apr. 28, 2012
Compensation and Retirement Disclosure [Abstract]        
Percentage of matching contribution 25.00% 50.00%    
Maximum annual contribution percentage   6.00%    
Award requisite service period   1 year    
Minimum age attained for award   21 years    
Minimum hours worked   1000 hours    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Contributions   $ 1,859 $ 1,713 $ 1,618
Officers and Former Director
        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Contributions   23 23 23
Contribution plan, accrued interest   $ 522 $ 629  
Lump sum distribution period, option one   5 years    
Lump sum distribution period, option two   10 years