Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance as of May 1	$ 5,333	$ 4,048
Increases for tax positions related to the current year	2,035	1,285
Balance as of April 30	$ 7,368	$ 5,333