Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Share-Based Payment Arrangement [Abstract]
Option to purchase common stock (in shares)			1,424,000	1,308,500
Stock-based compensation expense	$ 1,300	$ 1,000	$ 2,649	$ 1,817
Income tax excess benefit	29	$ 439	$ 63	$ 1,616
Stock options exercised (in shares)			97,800	545,242
Total intrinsic value of options exercised			$ 500	$ 7,600
Unrecognized compensation cost related to unvested stock option	$ 15,700		$ 15,700
Weighted average period for unrecognized compensation cost			1 year 11 months 15 days

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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 tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of noncash expense for share-based payment arrangement.

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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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Number of share options (or share units) exercised during the current period.

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