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Stockholders' Equity - Schedule of Assumptions used in Valuing ESPP Purchases (Detail) - Employee Stock Purchase Plan

12 Months Ended

Apr. 30, 2021

Apr. 30, 2020

Apr. 30, 2019

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Risk-free interest rate

0.08%

1.24%

2.21%

Expected term

^[1]

6 months

6 months

Expected volatility

^[2]

70.93%

63.60%

45.30%

Dividend yield

^[3]

1.17%

0.00%

0.00%

Minimum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Expected term

^[1]

4 months

Maximum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Expected term

^[1]

6 months

[1]	The 2nd purchase period of 2020 was abbreviated because of the timing of the spin-off of our outdoor products and accessories business.
[2]	We believe our expected volatility increased in fiscal 2020 primarily due to market and stock price fluctuations as a result of the COVID-19 pandemic.
[3]	We did not pay dividends in fiscal 2020 and 2019.

X

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Expected term of 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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