Provision for (Benefit from) Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2013
Income Tax Disclosure [Abstract]
Deferred tax assets, valuation allowance	$ 14,838	$ 18,106
Deferred tax assets, valuation allowance, increase (decrease)	(3,300)	1,400
Operating loss carryforwards	35,100	38,600
Operating loss, limitations on use	432			$ 12,000
Unrecognized tax benefits	$ 0	$ 181	$ 181