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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | Apr. 30, 2017 | Apr. 30, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | $ 179,759 | $ 81,499
Total definite-lived intangible assets, Accumulated Amortization | (38,668) | (18,575)
Total definite-lived intangible assets, Net Carrying Amount | 141,091 | 62,924
Indefinite-lived intangible assets, Net Carrying Amount | 226 |
Total Intangible assets, Gross Carrying Amount | 179,985 | 81,499
Total Intangible assets, Net Carrying Amount | 141,317 | 62,924
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 105,260 | 28,560
Total definite-lived intangible assets, Accumulated Amortization | (16,463) | (6,423)
Total definite-lived intangible assets, Net Carrying Amount | 88,797 | 22,137
Developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 19,430 | 16,430
Total definite-lived intangible assets, Accumulated Amortization | (5,436) | (2,890)
Total definite-lived intangible assets, Net Carrying Amount | 13,994 | 13,540
Patents, trademarks, and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 53,308 | 36,076
Total definite-lived intangible assets, Accumulated Amortization | (15,619) | (9,262)
Total definite-lived intangible assets, Net Carrying Amount | 37,689 | 26,814
Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 1,150 |
Total definite-lived intangible assets, Accumulated Amortization | (1,150) |
Definite-lived intangible assets excluding patents in progress |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 179,148 | 81,066
Total definite-lived intangible assets, Accumulated Amortization | (38,668) | (18,575)
Total definite-lived intangible assets, Net Carrying Amount | 140,480 | 62,491
Patents in progress |  |
Finite-Lived Intangible Assets [Line Items] |  |
Total definite-lived intangible assets, Gross Carrying Amount | 611 | 433
Total definite-lived intangible assets, Net Carrying Amount | $ 611 | $ 433

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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/presentationRef -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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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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