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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | Apr. 30, 2018 | Apr. 30, 2017
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Finite-Lived Intangible Assets [Line Items] |  |  |
Total definite-lived intangible assets, Gross Carrying Amount |  | $ 172,213 | $ 179,759
Total definite-lived intangible assets, Accumulated Amortization |  | (59,679) | (38,668)
Total definite-lived intangible assets, Net Carrying Amount |  | 112,534 | 141,091
Indefinite-lived intangible assets, Net Carrying Amount |  | 226 | 226
Total Intangible assets, Gross Carrying Amount |  | 172,439 | 179,985
Total Intangible assets, Net Carrying Amount |  | 112,760 | 141,317
Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Total definite-lived intangible assets, Gross Carrying Amount | [1] | 92,360 | 105,260
Total definite-lived intangible assets, Accumulated Amortization | [1] | (28,252) | (16,463)
Total definite-lived intangible assets, Net Carrying Amount | [1] | 64,108 | 88,797
Developed technology |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Total definite-lived intangible assets, Gross Carrying Amount |  | 21,130 | 19,430
Total definite-lived intangible assets, Accumulated Amortization |  | (8,178) | (5,436)
Total definite-lived intangible assets, Net Carrying Amount |  | 12,952 | 13,994
Patents, trademarks, and trade names |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Total definite-lived intangible assets, Gross Carrying Amount |  | 56,718 | 53,308
Total definite-lived intangible assets, Accumulated Amortization |  | (22,099) | (15,619)
Total definite-lived intangible assets, Net Carrying Amount |  | 34,619 | 37,689
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 |  | 171,358 | 179,148
Total definite-lived intangible assets, Accumulated Amortization |  | (59,679) | (38,668)
Total definite-lived intangible assets, Net Carrying Amount |  | 111,679 | 140,480
Patents in progress |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Total definite-lived intangible assets, Gross Carrying Amount |  | 855 | 611
Total definite-lived intangible assets, Net Carrying Amount |  | $ 855 | $ 611
[1] | Changes to the gross carrying amount of customer relationships is related to purchase accounting adjustments. For more information regarding the changes in valuation of customer relations, see Note 2 — Acquisitions to our consolidated financial statements.

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