Provision for Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2013
Income Tax Disclosure [Abstract]
Deferred tax assets, valuation allowance	$ 16,756	$ 15,502
Deferred tax assets, valuation allowance, increase	1,300	200
Operating loss carryforwards	41,300	48,000
Operating loss, limitations on use	432			$ 12,000
Unrecognized tax benefits	$ 181	$ 181	$ 181