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Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
Jul. 31, 2015
Apr. 30, 2015
Finite-Lived Intangible Assets [Line Items]    
Finite lived intangible assets, Gross Carrying Amount $ 80,094 $ 81,270
Finite lived intangible assets, Accumulated Amortization (10,099) (7,950)
Finite lived intangible assets, Net Carrying Amount 69,995 73,320
Intangible assets, Gross Carrying Amount 80,635 81,718
Intangible assets, Net Carrying Amount 70,536 73,768
Patents in progress    
Finite-Lived Intangible Assets [Line Items]    
Finite lived intangible assets, Net Carrying Amount 541 448
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 (2,813) (1,633)
Finite lived intangible assets, Net Carrying Amount 25,047 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 (1,327) (1,014)
Finite lived intangible assets, Net Carrying Amount 15,103 15,616
Patents, trademarks, and tradenames    
Finite-Lived Intangible Assets [Line Items]    
Finite lived intangible assets, Gross Carrying Amount 35,804 36,380
Finite lived intangible assets, Accumulated Amortization (5,959) (5,303)
Finite lived intangible assets, Net Carrying Amount $ 29,845 $ 31,077