Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2023	Jan. 31, 2022
Share-Based Payment Arrangement [Abstract]
Option to purchase common stock (in shares)			1,519,000	1,438,500
Stock-based compensation expense	$ 1,300	$ 1,100	$ 3,944	$ 2,910
Income tax excess benefit	4	$ 327	$ 67	$ 1,900
Stock options exercised (in shares)			140,800	678,129
Total intrinsic value of options exercised			$ 600	$ 9,100
Unrecognized compensation cost related to unvested stock option	$ 14,600		$ 14,600
Weighted average period for unrecognized compensation cost			1 year 10 months 17 days