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Acquisition-Related Intangible Assets (Detail) - Acquired Finite Lived Intangible Assets - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-Related Intangible Assets $ 6,862 $ 3,662
Accumulated amortization (3,463) (1,804)
Finite-Lived Intangible Assets, Net, Total 3,399 1,858
Current Technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-Related Intangible Assets $ 4,872 1,972
Weighted average amortization useful life 3 years  
Customer Relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-Related Intangible Assets $ 1,400 1,400
Weighted average amortization useful life 8 years  
Non-compete    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-Related Intangible Assets $ 390 290
Weighted average amortization useful life 3 years  
Trademarks    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-Related Intangible Assets $ 200 $ 0
Weighted average amortization useful life 3 years