Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Income Tax Disclosure [Line Items]
Effective income tax rate	19.10%	7.60%	8.60%
Tax benefits realized from the recognition of stock option deductions	$ 83	$ 2,067	$ 763
Foreign net operating loss carryforwards	2,860	3,873
Research and development state tax credits	586	522	640
United Kingdom and New Zealand
Income Tax Disclosure [Line Items]
Foreign net operating loss carryforwards	2,500
State and Local Jurisdiction
Income Tax Disclosure [Line Items]
Operating loss carryforwards	400
Research and development state tax credits	470	$ 561	$ 555
Foreign Tax Authority
Income Tax Disclosure [Line Items]
Operating loss carryforwards	$ 12,600