Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Income Tax Disclosure [Abstract]
Income tax expense	$ 1,149,000	$ 2,244,000	$ 3,282,000	$ 5,746,000
Effective tax rate	23.40%	21.80%	21.80%	25.10%
Discrete tax benefit			$ 363,000	$ 575,000