Goodwill and Intangible Assets, Net - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2022	Apr. 30, 2021
Intangible Assets Excluding Goodwill [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	$ 162,870	$ 162,324
Total definite-lived intangible assets, Accumulated Amortization	(119,546)	(109,111)
Total definite-lived intangible assets, Net Carrying Amount	43,324	53,213
Indefinite-lived intangible assets, Net Carrying Amount	430	430
Total Intangible assets, Gross Carrying Amount	163,300	162,754
Total Intangible assets, Net Carrying Amount	43,754	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	(66,053)	(60,347)
Total definite-lived intangible assets, Net Carrying Amount	23,927	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	(15,681)	(14,456)
Total definite-lived intangible assets, Net Carrying Amount	5,907	7,132
Patents, Trademarks, and Trade Names
Intangible Assets Excluding Goodwill [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	50,138	50,007
Total definite-lived intangible assets, Accumulated Amortization	(37,812)	(34,308)
Total definite-lived intangible assets, Net Carrying Amount	12,326	15,699
Definite-lived Intangible Assets Excluding Patents in Progress
Intangible Assets Excluding Goodwill [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	161,706	161,575
Total definite-lived intangible assets, Accumulated Amortization	(119,546)	(109,111)
Total definite-lived intangible assets, Net Carrying Amount	42,160	52,464
Patents in Progress
Intangible Assets Excluding Goodwill [Line Items]
Total definite-lived intangible assets, Gross Carrying Amount	1,164	749
Total definite-lived intangible assets, Net Carrying Amount	$ 1,164	$ 749