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Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Oct. 31, 2019	Apr. 30, 2019
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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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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