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Stockholders' Equity - Share Based Payment Award Performance Shares Valuation Assumptions (Detail) - PSUs
12 Months Ended
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.