Provision for (Benefit from) Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2013
Income Tax Disclosure [Abstract]
Deferred tax assets, valuation allowance	$ 18,106	$ 16,756
Deferred tax assets, valuation allowance, increase	1,400	1,300
Operating loss carryforwards	38,600	41,300
Operating loss, limitations on use	432			$ 12,000
Unrecognized tax benefits	$ 181	$ 181	$ 181