Leases - Additional Information (Details) - USD ($)	3 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Apr. 30, 2022
Lessee Lease Description [Line Items]
Operating lease cost	$ 1,000,000.0	$ 901,000
Short-term operating lease costs	$ 47,000	51,000
Operating lease, weighted average lease term	16 years
Operating lease, weighted average discount rate	5.40%
Operating right-of-use lease asset	$ 25,417,000		$ 23,884,000
Operating lease, liability	26,357,000		$ 24,879,000
Cash paid for amounts included in measurement of liabilities and operating cash flows	481,000	$ 443,000
Corporate Office and Warehouse
Lessee Lease Description [Line Items]
Operating right-of-use lease asset	1,900,000
Operating lease, liability	$ 1,900,000