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Preliminary Allocation of Total Purchase Price (Detail) - USD ($)
$ in Thousands
Aug. 23, 2016
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Business Acquisition [Line Items]        
Goodwill   $ 19,549 $ 18,749 $ 18,749
MID Retail, Inc.        
Business Acquisition [Line Items]        
Cash $ 46      
Accounts receivable, net 510      
Other current assets 66      
Property and equipment, net 16      
Goodwill 800      
Total Assets Acquired 4,638      
Current liabilities (135)      
Long-term liabilities (16)      
Total liabilities assumed (151)      
Net assets acquired 4,487      
MID Retail, Inc. | Current Technology        
Business Acquisition [Line Items]        
Intangible assets $ 2,900      
Useful Life 3 years      
MID Retail, Inc. | Non-compete        
Business Acquisition [Line Items]        
Intangible assets $ 100      
MID Retail, Inc. | Non-compete | Minimum        
Business Acquisition [Line Items]        
Useful Life 1 year      
MID Retail, Inc. | Non-compete | Maximum        
Business Acquisition [Line Items]        
Useful Life 3 years      
MID Retail, Inc. | Trade Names        
Business Acquisition [Line Items]        
Intangible assets $ 200      
Useful Life 3 years