Stock-Based Compensation- Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
Jul. 31, 2023	Jul. 31, 2022
Share-Based Payment Arrangement [Abstract]
Stock-based compensation expense	$ 1,554	$ 1,306
Income tax excess benefit	$ 0	$ 34
Stock options exercised (in shares)	22,253	43,000
Total intrinsic value of options exercised	$ 40	$ 200
Unrecognized compensation cost related to unvested stock option	15,300
Unrecognized compensation cost related to RSU awards	$ 700
Weighted average period for unrecognized compensation cost	1 year 9 months 21 days

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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

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