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Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
Jan. 31, 2016
Apr. 30, 2015
Finite-Lived Intangible Assets [Line Items]    
Finite lived intangible assets, Gross Carrying Amount $ 80,385 $ 81,270
Finite lived intangible assets, Accumulated Amortization (15,738) (7,950)
Finite lived intangible assets, Net Carrying Amount 64,647 73,320
Intangible assets, Gross Carrying Amount 80,752 81,718
Intangible assets, Net Carrying Amount 65,014 73,768
Patents in progress    
Finite-Lived Intangible Assets [Line Items]    
Indefinite lived intangible assets, Net Carrying Amount 367 448
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Finite lived intangible assets, Gross Carrying Amount 27,860 28,260
Finite lived intangible assets, Accumulated Amortization (5,198) (1,633)
Finite lived intangible assets, Net Carrying Amount 22,662 26,627
Developed technology    
Finite-Lived Intangible Assets [Line Items]    
Finite lived intangible assets, Gross Carrying Amount 16,430 16,630
Finite lived intangible assets, Accumulated Amortization (2,369) (1,014)
Finite lived intangible assets, Net Carrying Amount 14,061 15,616
Patents, trademarks, and trade names    
Finite-Lived Intangible Assets [Line Items]    
Finite lived intangible assets, Gross Carrying Amount 36,095 36,380
Finite lived intangible assets, Accumulated Amortization (8,171) (5,303)
Finite lived intangible assets, Net Carrying Amount $ 27,924 $ 31,077