Leases - Summary of Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Thousands	Apr. 30, 2022	Apr. 30, 2021
Finance Leases:
Property and equipment, at cost	$ 5,770	$ 4,801
Accumulated depreciation	(3,085)	(2,590)
Property and equipment, net	$ 2,685	$ 2,211
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property and equipment, net	Property and equipment, net
Other accrued liabilities	$ 1,049	$ 1,010
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other accrued liabilities	Other accrued liabilities
Other liabilities	$ 1,657	$ 1,301
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Total finance lease liabilities	$ 2,706	$ 2,311
Weighted average remaining lease terms:
Operating leases	5 years 1 month 6 days	5 years
Finance leases	3 years 3 months 18 days	2 years 8 months 12 days
Weighted average discount rate:
Operating leases	4.30%	4.80%
Finance leases	3.20%	4.20%