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Allocation of Total Purchase Price (Detail) - USD ($)
$ in Thousands
May. 30, 2014
Aug. 14, 2013
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Business Acquisition [Line Items]          
Goodwill     $ 18,749 $ 13,819 $ 12,601
Taylor Manufacturing Systems, USA, LLC          
Business Acquisition [Line Items]          
Current assets   $ 130      
Goodwill   1,218      
Total Assets Acquired   1,820      
Current liabilities   (213)      
Long Term liabilities   (366)      
Net Assets Acquired   1,241      
Taylor Manufacturing Systems, USA, LLC | Current Technology          
Business Acquisition [Line Items]          
Intangible assets   $ 472      
Useful Life   4 years      
MID Retail, Inc.          
Business Acquisition [Line Items]          
Cash $ 1,277        
Accounts receivable, net 546        
Current assets 35        
Property and equipment, net 32        
Other assets 505        
Goodwill 4,930        
Total Assets Acquired 10,515        
Current liabilities (825)        
Long Term liabilities (505)        
Total liabilities assumed (1,330)        
Net Assets Acquired 9,185        
MID Retail, Inc. | Current Technology          
Business Acquisition [Line Items]          
Intangible assets $ 1,500        
Useful Life 3 years        
MID Retail, Inc. | Non-compete          
Business Acquisition [Line Items]          
Intangible assets $ 290        
Useful Life 3 years        
MID Retail, Inc. | Customer Relationships          
Business Acquisition [Line Items]          
Intangible assets $ 1,400        
Useful Life 8 years