Leases - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021	Apr. 30, 2021
Leases [Abstract]
Right of use assets	$ 8,006		$ 8,006		$ 9,279
Operating cash paid to settle lease liabilities			$ 1,515	$ 1,299
Remaining lease term (in years)			8 years
Option to extend, term (in years)			5 years
Option to terminate, term (in years)			1 year
Operating lease, expense	754	$ 718	$ 2,309	2,032
Operating lease, short term, expense	$ 245	$ 267	$ 794	$ 733
Weighted average remaining lease term, operating lease (in years)	5 years 7 months 6 days		5 years 7 months 6 days
Weighted average discount rate, operating lease	4.10%		4.10%
Weighted average remaining lease term, finance lease (in years)	4 years 7 months 6 days		4 years 7 months 6 days
Weighted average discount rate, finance lease	6.80%		6.80%