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Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | Jan. 31, 2016 | Apr. 30, 2015
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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

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