Number Of Performance Periods

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Number Of Stock Based Compensation Plans

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Performance Period

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Period To Achieve Cultural Goals

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- Definition

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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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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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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Amount of cash inflow from exercise of 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, 2021 USD ($) performance_period plan award shares	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans \| award	2
Stock-based compensation expense, before income taxes	$ 4,598	$ 3,989	$ 3,040
Number of stock incentive plans \| plan	2
Shares available for awards \| shares	632,666
Cash received from options exercised	$ 0	300	500
Performance period	1 year
Period to achieve cultural goals	3 years
Accrued compensation and related expenses	$ 58,577	49,064
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years	3 years
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	$ 11,100
Expected to be recognized over a weighted average period	1 year 9 months 18 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	11,456
Service-Based Restricted Stock Tracking Units (RSTUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved for grants \| shares	6,229
Restricted Stock Tracking Units (RSTUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense, before income taxes	$ 900	0	$ 500
Vesting period, years	3 years
Accrued compensation and related expenses	$ 1,000	$ 400