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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | Jul. 31, 2018 | Apr. 30, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | $ 172,398 | $ 172,213
Total definite-lived intangible assets, Accumulated Amortization | (65,170) | (59,679)
Total definite-lived intangible assets, Net Carrying Amount | 107,228 | 112,534
Indefinite-lived intangible assets, Net Carrying Amount | 226 | 226
Total Intangible assets, Gross Carrying Amount | 172,624 | 172,439
Total Intangible assets, Net Carrying Amount | 107,454 | 112,760
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 92,360 | 92,360
Total definite-lived intangible assets, Accumulated Amortization | (30,719) | (28,252)
Total definite-lived intangible assets, Net Carrying Amount | 61,641 | 64,108
Developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 21,130 | 21,130
Total definite-lived intangible assets, Accumulated Amortization | (9,461) | (8,178)
Total definite-lived intangible assets, Net Carrying Amount | 11,669 | 12,952
Patents, trademarks, and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 56,879 | 56,718
Total definite-lived intangible assets, Accumulated Amortization | (23,840) | (22,099)
Total definite-lived intangible assets, Net Carrying Amount | 33,039 | 34,619
Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 1,150 | 1,150
Total definite-lived intangible assets, Accumulated Amortization | (1,150) | (1,150)
Definite-lived intangible assets excluding patents in progress |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 171,519 | 171,358
Total definite-lived intangible assets, Accumulated Amortization | (65,170) | (59,679)
Total definite-lived intangible assets, Net Carrying Amount | 106,349 | 111,679
Patents in progress |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 879 | 855
Total definite-lived intangible assets, Net Carrying Amount | $ 879 | $ 855

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