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Business Combinations - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 30, 2016
Jan. 30, 2016
Oct. 31, 2015
Aug. 01, 2015
May 02, 2015
Jan. 31, 2015
Nov. 01, 2014
Aug. 02, 2014
Apr. 30, 2016
May 02, 2015
Apr. 26, 2014
Mar. 15, 2016
Aug. 11, 2014
May 08, 2013
Business Acquisition [Line Items]                            
Goodwill acquired                 $ 2,715          
Net sales $ 138,463 $ 123,816 $ 157,668 $ 150,221 $ 158,086 $ 118,123 $ 173,115 $ 166,618 570,168 $ 615,942 $ 551,970      
General and administrative                 32,801 30,679 27,984      
International                            
Business Acquisition [Line Items]                            
Goodwill acquired                 213          
Net sales                 94,472 102,282 85,578      
Commerical                            
Business Acquisition [Line Items]                            
Goodwill acquired                 2,502          
Net sales                 148,261 $ 165,793 $ 154,754      
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          
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%  
Property and equipment acquired 1,433               1,433       $ 1,433  
Inventory acquired 2,624               2,624       2,773  
Receivables acquired 3,063               3,063       3,380  
Other current assets acquired 1,892               1,892       1,869  
Liabilities acquired 3,695               3,695       3,616  
Long term debt obligations 950               $ 950       $ 950  
ADFLOW Networks [Member]                            
Business Acquisition [Line Items]                            
Percentage acquired                       100.00%    
Goodwill acquired 2,502                          
Property and equipment acquired                       $ 58    
Inventory acquired                       230    
Receivables acquired                       1,283    
Other current assets acquired                       513    
Liabilities acquired                       935    
Long term debt obligations                       $ 1,545    
Deferred payments $ 1,833                          
Deferred payments period 3 years                          
ADFLOW Networks [Member] | Commerical                            
Business Acquisition [Line Items]                            
Net sales $ 542                          
General and administrative 295                          
ADFLOW Networks [Member] | Customer Relationships [Member]                            
Business Acquisition [Line Items]                            
Finite-lived intangible assets acquired 2,692                          
ADFLOW Networks [Member] | Computer Software, Intangible Asset [Member]                            
Business Acquisition [Line Items]                            
Finite-lived intangible assets acquired $ 3,176