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Stockholders' Equity - Share Based Payment Award Performance Shares Valuation Assumptions (Detail) - PSUs | 12 Months Ended
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Apr. 30, 2021 CorrelationCoefficient $ / shares | Apr. 30, 2020 CorrelationCoefficient $ / shares | Apr. 30, 2019 CorrelationCoefficient $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Correlation coefficient | CorrelationCoefficient | [1] |  | 0.11 | 0.14
Risk-free interest rate, minimum | [2] | 0.16% |  |
Risk-free interest rate | [2] |  | 0.35% | 2.23%
Risk-free interest rate, maximum | [2] | 0.22% |  |
Dividend yield | [3] | 0.95% | 0.00% | 0.00%
Smith & Wesson Brands, Inc. |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grant date fair market value |  |  | $ 7.80 | $ 9.85
Volatility, minimum | [4] | 59.09% |  |
Volatility | [4] |  | 54.02% | 45.19%
Volatility, maximum | [4] | 61.34% |  |
Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Correlation coefficient | CorrelationCoefficient | [1] | 0.1242 |  |
Minimum | Smith & Wesson Brands, Inc. |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grant date fair market value |  | $ 16.99 |  |
Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Correlation coefficient | CorrelationCoefficient | [1] | 0.1302 |  |
Maximum | Smith & Wesson Brands, Inc. |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grant date fair market value |  | $ 17.27 |  |
Russell 2000 Index |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grant date fair market value |  |  | $ 1,138.78 | $ 1,591.21
Volatility, minimum | [4] | 27.62% |  |
Volatility | [4] |  | 24.66% | 15.65%
Volatility, maximum | [4] | 29.27% |  |
Russell 2000 Index | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grant date fair market value |  | $ 1,526.46 |  |
Russell 2000 Index | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grant date fair market value |  | $ 1,571.21 |  |
[1] | The correlation coefficient utilizes the same historical price data used to develop the volatility assumptions.
[2] | The risk-free interest rate is based on the yield of a zero-coupon U.S. Treasury bill, commensurate with the three-year performance period.
[3] | We did not pay dividends in fiscal 2020 and 2019.
[4] | Expected volatility is calculated over the most recent period that represents the remaining term of the performance period as of the valuation date, or three years.

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- Definition Share based compensation arrangement by share based payment award fair value assumptions correlation coefficient. + References No definition available. + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum 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. + References No definition available. + Details
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- Definition The estimated measure of the minimum 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. + References No definition available. + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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