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Business Combinations (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
May. 02, 2015
Jan. 31, 2015
Nov. 01, 2014
Aug. 02, 2014
Apr. 26, 2014
Jan. 25, 2014
Oct. 26, 2013
Jul. 27, 2013
May. 02, 2015
Apr. 26, 2014
Apr. 27, 2013
Aug. 11, 2014
May. 08, 2013
Business Acquisition [Line Items]                          
Goodwill acquired                 $ 1,249        
Net sales $ 158,086 $ 118,123 $ 173,115 $ 166,618 $ 136,240 $ 115,369 $ 161,639 $ 138,722 615,942 $ 551,970 $ 518,322    
General and administrative                 30,679 27,984 27,404    
International                          
Business Acquisition [Line Items]                          
Goodwill acquired                 1,249        
Net sales                 102,282 85,578 $ 75,766    
OPEN                          
Business Acquisition [Line Items]                          
Percentage acquired                         100.00%
Goodwill acquired   1,249                      
Property and equipment acquired   2,658                      
Inventory acquired   2,038                      
Other current assets acquired   833                      
Liabilities acquired   1,230                      
Long-term debt acquired   4,155                      
Deferred payments   $ 2,375                      
Deferred payments period   5 years                      
OPEN | International                          
Business Acquisition [Line Items]                          
Net sales                 4,218        
General and administrative                 44 $ 146      
OPEN | Trade Names                          
Business Acquisition [Line Items]                          
Finite-lived intangible assets acquired   $ 1,160                      
Acquired intangible assets useful life   20 years                      
OPEN | Customer Lists                          
Business Acquisition [Line Items]                          
Finite-lived intangible assets acquired   $ 582                      
Acquired intangible assets useful life   9 years                      
Data Display [Member]                          
Business Acquisition [Line Items]                          
Percentage acquired                       100.00%  
Goodwill acquired     1,249                    
Property and equipment acquired                       $ 1,433  
Other Noncurrent Assets acquired                       437  
Inventory acquired                       2,773  
Receivables acquired                       3,380  
Other current assets acquired                       1,869  
Liabilities acquired                       3,616  
Long term debt obligations                       $ 950  
Data Display [Member] | International                          
Business Acquisition [Line Items]                          
Net sales                 8,138        
General and administrative                 $ 434        
Data Display [Member] | Unpatented Technology [Member]                          
Business Acquisition [Line Items]                          
Finite-lived intangible assets acquired     $ 480                    
Acquired intangible assets useful life     20 years                    
Data Display [Member] | Customer Relationships [Member]                          
Business Acquisition [Line Items]                          
Finite-lived intangible assets acquired     $ 84                    
Acquired intangible assets useful life     18 years