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Performance Period

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Period To Achieve Cultural Goals

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Stock-Based Compensation (Narrative) (Details) $ in Thousands	12 Months Ended
	Apr. 30, 2023 USD ($) plan performance_period shares	Apr. 30, 2022 USD ($)	Apr. 30, 2021 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense, before income taxes \| $	$ 7,396	$ 4,708	$ 4,598
Number of stock incentive plans \| plan	2
Shares available for awards \| shares	370,816
Performance period	1 year
Period to achieve cultural goals	3 years
Accrued compensation and related expenses \| $	$ 49,953	$ 44,436
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 \| $	$ 14,100
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
Performance-Based Restricted Stock Tracking Units (RSTUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved for grants \| shares	11,945
Service-Based Restricted Stock Tracking Units (RSTUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved for grants \| shares	6,490
Restricted Stock Tracking Units (RSTUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years	3 years