Goodwill and Intangible Assets, Net - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Apr. 30, 2021
Intangible Assets Excluding Goodwill [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	$ 162,516	$ 162,324
Total definite-lived intangible assets, Accumulated Amortization	(112,625)	(109,111)
Total definite-lived intangible assets, Net Carrying Amount	49,891	53,213
Indefinite-lived intangible assets, Net Carrying Amount	430	430
Total Intangible assets, Gross Carrying Amount	162,946	162,754
Total Intangible assets, Net Carrying Amount	50,321	53,643
Customer Relationships
Intangible Assets Excluding Goodwill [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	89,980	89,980
Total definite-lived intangible assets, Accumulated Amortization	(62,248)	(60,347)
Total definite-lived intangible assets, Net Carrying Amount	27,732	29,633
Developed Technology
Intangible Assets Excluding Goodwill [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	21,588	21,588
Total definite-lived intangible assets, Accumulated Amortization	(14,903)	(14,456)
Total definite-lived intangible assets, Net Carrying Amount	6,685	7,132
Patents, Trademarks, and Trade Names
Intangible Assets Excluding Goodwill [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	50,024	50,007
Total definite-lived intangible assets, Accumulated Amortization	(35,474)	(34,308)
Total definite-lived intangible assets, Net Carrying Amount	14,550	15,699
Definite-lived Intangible Assets Excluding Patents in Progress
Intangible Assets Excluding Goodwill [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	161,592	161,575
Total definite-lived intangible assets, Accumulated Amortization	(112,625)	(109,111)
Total definite-lived intangible assets, Net Carrying Amount	48,967	52,464
Patents in Progress
Intangible Assets Excluding Goodwill [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	924	749
Total definite-lived intangible assets, Net Carrying Amount	$ 924	$ 749