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Stockholders' Equity - Share Based Payment Award Performance Shares Valuation Assumptions (Detail)
12 Months Ended
Apr. 30, 2017
CorrelationCoefficient
$ / shares
Apr. 30, 2016
CorrelationCoefficient
$ / shares
Apr. 30, 2015
CorrelationCoefficient
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Correlation coefficient | CorrelationCoefficient [1] 0.22 0.32 0.32
Risk-free interest rate [2] 1.44% 0.93% 0.91%
Dividend yield [3] 0.00% 0.00% 0.00%
American Outdoor Brands Corporation | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date fair market value $ 21.89 $ 21.93 $ 14.90
Volatility [4] 41.67% 39.93% 44.51%
Russell 2000 Index      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date fair market value $ 1,417.13 $ 1,140.40 $ 1,246.95
Volatility [4] 16.77% 16.75% 15.76%
[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.