Number Of Performance Periods

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- Definition

Number Of Stock Based Compensation Plans

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- Definition

Performance Period

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- Definition

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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No definition available.

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- Definition

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

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- Definition

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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- Definition

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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- Definition

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

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- Definition

Amount of cash inflow from exercise of option under share-based payment arrangement.

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- Definition

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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- Definition

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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- Definition

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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock-Based Compensation (Narrative) (Details) $ in Thousands	12 Months Ended
	Apr. 30, 2020 USD ($) plan performance_period award shares	Apr. 30, 2019 USD ($)	Apr. 30, 2018 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	$ 3,989	$ 3,040	$ 3,097
Number of stock incentive plans \| plan	2
Shares available for awards \| shares	716,027
Contractual terms, years	0 years
Cash received from options exercised	$ 300	500	1,300
Accrued compensation and related expenses	$ 49,064	54,906
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years	3 years
Stock Options [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual terms, years	10 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, years	3 years
Total unrecognized compensation expense related to unvested stock options granted	$ 7,900
Expected to be recognized over a weighted average period	1 year 7 months 6 days
Number of performance periods \| performance_period	3
Performance period	1 year
Period to achieve cultural goals	3 years
Employee And Non Employee Director Service Based Restricted Stock Units [Member]
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	6,483
Service-Based Restricted Stock Tracking Units (RSTUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved for grants \| shares	3,482
Restricted Stock Tracking Units (RSTUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense, before income taxes	$ 0	500	$ 400
Vesting period, years	3 years
Accrued compensation and related expenses	$ 400	$ 700