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Stockholders' Equity - Share Based Payment Award Performance Shares Valuation Assumptions (Detail) - PSUs
12 Months Ended
Apr. 30, 2018
CorrelationCoefficient
$ / shares
Apr. 30, 2017
CorrelationCoefficient
$ / shares
Apr. 30, 2016
CorrelationCoefficient
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Correlation coefficient | CorrelationCoefficient [1] 0.19 0.22 0.32
Risk-free interest rate [2] 2.61% 1.44% 0.93%
Dividend yield [3] 0.00% 0.00% 0.00%
American Outdoor Brands Corporation      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date fair market value $ 11.11 $ 21.89 $ 21.93
Volatility [4] 42.27% 41.67% 39.93%
Russell 2000 Index      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date fair market value $ 1,557.89 $ 1,417.13 $ 1,140.40
Volatility [4] 16.26% 16.77% 16.75%
[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 do not expect to pay dividends in the foreseeable future.
[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.