Leases - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Leases [Abstract]
Operating lease cost	$ 934,000	$ 965,000	$ 2,800,000	$ 2,200,000
Short-term operating lease costs	$ 57,000	$ 32,000	$ 158,000	217,000
Operating lease, weighted average lease term	16 years 2 months 12 days		16 years 2 months 12 days
Operating lease, weighted average discount rate	5.40%		5.40%
Cash paid for amounts included in measurement of liabilities and operating cash flows			$ 1,400,000	$ 1,100,000