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Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | Oct. 31, 2019 | Apr. 30, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | $ 173,651 | $ 173,314
Total definite-lived intangible assets, Accumulated Amortization | (91,315) | (81,700)
Total definite-lived intangible assets, Net Carrying Amount | 82,336 | 91,614
Indefinite-lived intangible assets, Net Carrying Amount | 226 | 226
Total Intangible assets, Gross Carrying Amount | 173,877 | 173,540
Total Intangible assets, Net Carrying Amount | 82,562 | 91,840
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 92,560 | 92,560
Total definite-lived intangible assets, Accumulated Amortization | (47,312) | (41,643)
Total definite-lived intangible assets, Net Carrying Amount | 45,248 | 50,917
Developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 21,230 | 21,230
Total definite-lived intangible assets, Accumulated Amortization | (11,454) | (10,428)
Total definite-lived intangible assets, Net Carrying Amount | 9,776 | 10,802
Patents, trademarks, and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 57,747 | 57,477
Total definite-lived intangible assets, Accumulated Amortization | (31,399) | (28,479)
Total definite-lived intangible assets, Net Carrying Amount | 26,348 | 28,998
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 | 172,687 | 172,417
Total definite-lived intangible assets, Accumulated Amortization | (91,315) | (81,700)
Total definite-lived intangible assets, Net Carrying Amount | 81,372 | 90,717
Patents in progress |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 964 | 897
Total definite-lived intangible assets, Net Carrying Amount | $ 964 | $ 897

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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