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Stockholders' Equity (Tables) | 12 Months Ended
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Apr. 30, 2017
Equity [Abstract] |
Share Based Compensation Stock Options Activity | The number of shares and weighted average exercise prices of options for the fiscal years ended April 30, 2017, 2016, and 2015 are as follows:
| For the Years Ended April 30,
| 2017 |  |  | 2016 |  |  | 2015
|  |  |  |  | Weighted |  |  |  |  |  |  | Weighted |  |  |  |  |  |  | Weighted
|  |  |  |  | Average |  |  |  |  |  |  | Average |  |  |  |  |  |  | Average
| Shares |  |  | Exercise Price |  |  | Shares |  |  | Exercise Price |  |  | Shares |  |  | Exercise Price
Options outstanding, beginning of year |  | 389,360 |  |  | $ | 6.16 |  |  |  | 1,879,630 |  |  | $ | 6.37 |  |  |  | 2,258,349 |  |  | $ 6.15
Exercised during the period |  | (54,200 | ) |  |  | 3.57 |  |  |  | (1,490,270 | ) |  |  | 6.42 |  |  |  | (365,719 | ) |  | 4.96
Canceled/forfeited during period | — |  |  | — |  |  | — |  |  | — |  |  |  | (13,000 | ) |  | 7.98
Options outstanding, end of year |  | 335,160 |  |  | $ | 6.58 |  |  |  | 389,360 |  |  | $ | 6.16 |  |  |  | 1,879,630 |  |  | $ 6.37
Weighted average remaining contractual life | 4.01 years |  |  |  |  |  |  | 5.04 years |  |  |  |  |  |  | 5.02 years |  |  |  |
Options exercisable, end of year |  | 335,160 |  |  | $ | 6.58 |  |  |  | 389,360 |  |  | $ | 6.16 |  |  |  | 1,878,464 |  |  | $ 6.36
Weighted average remaining contractual life | 4.01 years |  |  |  |  |  |  | 5.04 years |  |  |  |  |  |  | 5.02 years |  |  |
Summary of Stock Compensation Expense | The following table summarizes stock compensation expense by line item for the fiscal years ended April 30, 2017, 2016, and 2015 (in thousands):
|  | For the Years Ended April 30, |
|  |  | 2017 |  |  |  | 2016 |  |  |  | 2015 |
Cost of sales |  | $ | 1,139 |  |  | $ | 564 |  |  | $ | 520 |
Research and development |  |  | 217 |  |  |  | 169 |  |  |  | 139 |
Selling and marketing |  |  | 801 |  |  |  | 494 |  |  |  | 379 |
General and administrative |  |  | 6,433 |  |  |  | 5,245 |  |  |  | 4,770 |
Total stock-based compensation |  | $ | 8,590 |  |  | $ | 6,472 |  |  | $ | 5,808 |
Share Based Payment Award Performance Shares Valuation Assumptions | We incorporate the following variables into the valuation model:
|  | For the Years Ended April 30, |
|  |  | 2017 |  |  | 2016 |  |  | 2015 |
Grant date fair market value |  |  |  |  |  |  |  |  |  |  |  |
American Outdoor Brands Corporation |  | $ | 21.89 |  |  | $ | 21.93 |  |  | $ | 14.90 |
Russell 2000 Index |  | $ | 1,417.13 |  |  | $ | 1,140.40 |  |  | $ | 1,246.95 |
Volatility (a) |  |  |  |  |  |  |  |  |  |  |  |
American Outdoor Brands Corporation |  |  | 41.67 | % |  |  | 39.93 | % |  |  | 44.51 | %
Russell 2000 Index |  |  | 16.77 | % |  |  | 16.75 | % |  |  | 15.76 | %
Correlation coefficient (b) |  |  | 0.22 |  |  |  | 0.32 |  |  | 0.32 |
Risk-free interest rate (c) |  |  | 1.44 | % |  |  | 0.93 | % |  |  | 0.91 | %
Dividend yield (d) |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
(a) | 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.
(b) | The correlation coefficient utilizes the same historical price data used to develop the volatility assumptions.
(c) | 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.
(d) | We do not expect to pay dividends in the foreseeable future.
Summary of Activity in Unvested RSUs and PSUs | A summary of activity for unvested RSUs and PSUs for fiscal years 2017, 2016, and 2015 is as follows:
| For the Years Ended April 30, |
| 2017 |  |  | 2016 |  |  | 2015 |
|  |  |  |  | Weighted |  |  |  |  |  |  | Weighted |  |  |  |  |  |  |  | Weighted |
| Total # of |  |  | Average |  |  | Total # of |  |  | Average |  |  | Total # of |  |  |  | Average |
| Restricted |  |  | Grant Date |  |  | Restricted |  |  | Grant Date |  |  | Restricted |  |  |  | Grant Date |
| Stock Units |  |  | Fair Value |  |  | Stock Units |  |  | Fair Value |  |  | Stock Units |  |  |  | Fair Value |
RSUs and PSUs outstanding, beginning of year |  | 1,215,753 |  |  | $ | 15.38 |  |  |  | 1,190,879 |  |  | $ | 12.45 |  |  |  | 1,015,475 |  |  |  | $ | 10.56 |
Awarded |  | 666,509 |  |  |  | 19.85 |  |  |  | 541,077 |  |  |  | 17.72 |  |  |  | 709,672 |  |  |  |  | 11.82 |
Vested |  | (433,966 | ) |  |  | 11.64 |  |  |  | (430,768 | ) |  |  | 10.57 |  |  |  | (433,266 | ) |  |  |  | 9.18 |
Forfeited |  | (19,448 | ) |  |  | 17.19 |  |  |  | (85,435 | ) |  |  | 10.94 |  |  |  | (101,002 | ) |  |  |  | 11.93 |
RSUs and PSUs outstanding, end of period |  | 1,428,848 |  |  | $ | 18.58 |  |  |  | 1,215,753 |  |  | $ | 15.38 |  |  |  | 1,190,879 |  |  |  | $ | 12.45 |
Schedule of Assumptions used in Valuing ESPP Purchases | The following assumptions were used in valuing our ESPP purchases during the years ended April 30, 2017, 2016, and 2015:
| For the Years Ended April 30, |
| 2017 |  |  | 2016 |  |  | 2015 |
Risk-free interest rate | 0.60% |  |  |  | 0.19 | % |  |  | 0.07 | %
Expected term | 6 months |  |  | 6 months |  |  | 6 months |
Expected volatility |  | 45.3 | % |  |  | 40.9 | % |  |  | 38.2 | %
Dividend yield | 0% |  |  | 0% |  |  |  | 0 | %

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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