Unrecognized Tax Benefits - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Apr. 30, 2021
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 11,357		$ 9,316
Unrecognized tax benefits that would impact effective tax rate	8,972
Accrued interest and penalties related to unrecognized tax benefits	488		$ 370
Net interest and penalties included in income tax expense	118	$ 106
Expected decrease in unrecognized tax benefits	$ 2,000