Stock-Based Compensation (Narrative) (Details) $ in Thousands	12 Months Ended
	Apr. 30, 2024 USD ($) performance_period plan shares	Apr. 30, 2023 USD ($)	Apr. 30, 2022 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense, before income taxes	$ 10,682	$ 7,396	$ 4,708
Number of stock incentive plans | plan	3
Shares available for awards | shares	749,850
Performance period	1 year
Period to achieve cultural goals	3 years
Total unrecognized compensation expense related to unvested stock options granted	$ 3,100
Expected to be recognized over a weighted average period	2 years 3 months 18 days
Accrued compensation and related expenses	$ 61,212	$ 49,953
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance periods | performance_period	3
Total unrecognized compensation expense related to unvested stock options granted	$ 17,700
Expected to be recognized over a weighted average period	1 year 8 months 12 days
Restricted Stock Units (RSUs) [Member] | Employee Only
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years	3 years
Restricted Stock Units (RSUs) [Member] | Non Employee Directors only
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years	2 years
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years	3 years
Share-Based Compensation Arrangement By Share-Based Payment Award, Contractual Term	10 years
Employee Service-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years	1 year
Share-based Goods and Nonemployee Services Transaction, Shares Issuable Per Restricted Stock Unit Granted | shares	1