Stock-Based Compensation Stock Option Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Shares
Options granted (in shares)			0
Stock options
Intrinsic value of options
Intrinsic value of options exercised	$ 0	$ 7,369	$ 4,785
Intrinsic value of options outstanding	$ 8,732	$ 4,822
Restated 2006 Plan \| Stock options
Shares
Outstanding at the beginning of the year (in shares)	66,164	166,164	280,526
Options exercised (in shares)		(100,000)	(114,362)
Outstanding at the end of the year (in shares)	66,164	66,164	166,164
Options exercisable (in shares)	66,164
Weighted Average Exercise Price
Outstanding at the beginning of the year (in dollars per share)	$ 27.82	$ 24.78	$ 24.57
Options exercised (in dollars per share)		22.77	24.28
Outstanding at the end of the year (in dollars per share)	27.82	$ 27.82	$ 24.78
Options exercisable (in dollars per share)	$ 27.82

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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