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Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Jan. 31, 2020	Apr. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	$ 174,318	$ 173,314
Total definite-lived intangible assets, Accumulated Amortization	(96,302)	(81,700)
Total definite-lived intangible assets, Net Carrying Amount	78,016	91,614
Indefinite-lived intangible assets, Net Carrying Amount	330	226
Total Intangible assets, Gross Carrying Amount	174,648	173,540
Total Intangible assets, Net Carrying Amount	78,346	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	(50,325)	(41,643)
Total definite-lived intangible assets, Net Carrying Amount	42,235	50,917
Developed technology
Finite-Lived Intangible Assets [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	21,788	21,230
Total definite-lived intangible assets, Accumulated Amortization	(11,968)	(10,428)
Total definite-lived intangible assets, Net Carrying Amount	9,820	10,802
Patents, trademarks, and trade names
Finite-Lived Intangible Assets [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	57,775	57,477
Total definite-lived intangible assets, Accumulated Amortization	(32,859)	(28,479)
Total definite-lived intangible assets, Net Carrying Amount	24,916	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	173,273	172,417
Total definite-lived intangible assets, Accumulated Amortization	(96,302)	(81,700)
Total definite-lived intangible assets, Net Carrying Amount	76,971	90,717
Patents in progress
Finite-Lived Intangible Assets [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	1,045	897
Total definite-lived intangible assets, Net Carrying Amount	$ 1,045	$ 897

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