Presentation and Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenues	$ 102,515	$ 108,252	$ 106,521
Domestic
Disaggregation of Revenue [Line Items]
Total revenues	80,893	84,361
International
Disaggregation of Revenue [Line Items]
Total revenues	$ 21,622	$ 23,891