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Presentation and Summary of Significant Accounting Policies - Acquisition-Related Intangible Assets (Detail) - Acquired Finite Lived Intangible Assets - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-Related Intangible Assets $ 8,140 $ 6,862
Accumulated amortization (3,020) (3,463)
Finite-Lived Intangible Assets, Net, Total 5,120 3,399
Current Technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-Related Intangible Assets $ 6,000 4,872
Weighted average amortization useful life 3 years  
Customer Relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-Related Intangible Assets $ 1,700 1,400
Weighted average amortization useful life 8 years  
Non-compete    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-Related Intangible Assets $ 100 390
Weighted average amortization useful life 3 years  
Trademarks    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquisition-Related Intangible Assets $ 340 $ 200
Weighted average amortization useful life 3 years