Presentation and Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenues	$ 123,659	$ 127,553	$ 111,408
Domestic
Disaggregation of Revenue [Line Items]
Total revenues	99,720	107,099
International
Disaggregation of Revenue [Line Items]
Total revenues	$ 23,939	$ 20,454