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Stockholders' Equity - Share Based Compensation Stock Options Activity (Detail) - $ / shares	9 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Shares
Options outstanding, beginning of year, Shares	200,667	267,761
Exercised during the period, Shares	(200,667)	(15,000)
Canceled/forfeited during period, Shares		(160,667)
Options outstanding, end of period, Shares	0	92,094
Weighted average remaining contractual life		5 months 12 days
Options exercisable, end of period, Shares		92,094
Weighted average remaining contractual life		5 months 12 days
Weighted-Average Exercise Price
Options outstanding, beginning of year, Weighted-Average Exercise Price	$ 7.67	$ 6.76
Exercised during period, Weighted-Average Exercise Price	$ 7.67	5.79
Canceled/forfeited during period, Weighted-Average Exercise Price		8.89
Options outstanding, end of period, Weighted-Average Exercise Price		3.22
Options exercisable, end of period, Weighted-Average Exercise Price		$ 3.22

X

- Definition

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.

+ References

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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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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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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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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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