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Business Combinations (Details) (USD $)
3 Months Ended 12 Months Ended
Apr. 26, 2014
Jan. 25, 2014
Oct. 26, 2013
Jul. 27, 2013
Apr. 27, 2013
Jan. 26, 2013
Oct. 27, 2012
Jul. 28, 2012
Apr. 26, 2014
Apr. 27, 2013
Apr. 28, 2012
May 08, 2013
Business Acquisition [Line Items]                        
Percentage acquired                       100.00%
Goodwill acquired                 $ 1,250,000      
Net sales 136,240,000 115,369,000 161,639,000 138,722,000 124,482,000 111,050,000 149,871,000 132,919,000 551,970,000 518,322,000 489,526,000  
General and administrative                 27,984,000 27,404,000 27,422,000  
International
                       
Business Acquisition [Line Items]                        
Goodwill acquired                 1,250,000      
Net sales                 85,578,000 75,766,000 72,062,000  
OPEN
                       
Business Acquisition [Line Items]                        
Goodwill acquired   1,250,000                    
Property and equipment acquired   2,658,000                    
Inventory acquired   2,038,000                    
Other current assets acquired   833,000                    
Liabilities acquired   1,230,000                    
Long-term debt acquired   4,155,000                    
Deferred payments   2,300,000                    
Deferred payments period   5 years                    
OPEN | International
                       
Business Acquisition [Line Items]                        
Net sales                 4,200,000      
General and administrative                 44,000 146,000    
OPEN | Trade Names
                       
Business Acquisition [Line Items]                        
Finite-lived intangible assets acquired   1,160,000                    
Acquired intangible assets useful life   20 years                    
OPEN | Customer Lists
                       
Business Acquisition [Line Items]                        
Finite-lived intangible assets acquired   $ 582,000                    
Acquired intangible assets useful life   9 years