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Stockholders' Equity (Tables) | 12 Months Ended
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Apr. 30, 2018
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, 2018, 2017, and 2016 are as follows:
| For the Years Ended April 30, |
| 2018 |  |  | 2017 |  |  | 2016 |
|  |  |  |  | Weighted |  |  |  |  |  |  | Weighted |  |  |  |  |  |  | Weighted |
|  |  |  |  | Average |  |  |  |  |  |  | Average |  |  |  |  |  |  | Average |
| Shares |  |  | Exercise Price |  |  | Shares |  |  | Exercise Price |  |  | Shares |  |  | Exercise Price |
Options outstanding, beginning of year |  | 335,160 |  |  | $ | 6.58 |  |  |  | 389,360 |  |  | $ | 6.16 |  |  |  | 1,879,630 |  |  | $ | 6.37 |
Exercised during the period |  | (19,000 | ) |  |  | 4.70 |  |  |  | (54,200 | ) |  |  | 3.57 |  |  |  | (1,490,270 | ) |  |  | 6.42 |
Options outstanding, end of period |  | 316,160 |  |  | $ | 6.69 |  |  |  | 335,160 |  |  | $ | 6.58 |  |  |  | 389,360 |  |  | $ | 6.16 |
Weighted average remaining contractual life | 3.16 years |  |  |  |  |  |  | 4.01 years |  |  |  |  |  |  | 5.04 years |  |  |  |  |
Options exercisable, end of period |  | 316,160 |  |  | $ | 6.69 |  |  |  | 335,160 |  |  | $ | 6.58 |  |  |  | 389,360 |  |  | $ | 6.16 |
Weighted average remaining contractual life | 3.16 years |  |  |  |  |  |  | 4.01 years |  |  |  |  |  |  | 5.04 years |  |  |  |  |
Summary of Stock Compensation Expense | The following table summarizes stock compensation expense by line item for the fiscal years ended April 30, 2018, 2017, and 2016 (in thousands):
|  | For the Years Ended April 30, |
|  |  | 2018 |  |  |  | 2017 |  |  |  | 2016 |
Cost of sales |  | $ | 882 |  |  | $ | 1,139 |  |  | $ | 564 |
Research and development |  |  | 187 |  |  |  | 217 |  |  |  | 169 |
Selling and marketing |  |  | 382 |  |  |  | 801 |  |  |  | 494 |
General and administrative |  |  | 6,364 |  |  |  | 6,433 |  |  |  | 5,245 |
Total stock-based compensation |  | $ | 7,815 |  |  | $ | 8,590 |  |  | $ | 6,472 |
Share Based Payment Award Performance Shares Valuation Assumptions | We incorporate the following variables into the valuation model:
|  | For the Years Ended April 30, |
|  |  | 2018 |  |  | 2017 |  |  | 2016 |
Grant date fair market value |  |  |  |  |  |  |  |  |  |  |  |
American Outdoor Brands Corporation |  | $ | 11.11 |  |  | $ | 21.89 |  |  | $ | 21.93 |
Russell 2000 Index |  | $ | 1,557.89 |  |  | $ | 1,417.13 |  |  | $ | 1,140.40 |
Volatility (a) |  |  |  |  |  |  |  |  |  |  |  |
American Outdoor Brands Corporation |  |  | 42.27 | % |  |  | 41.67 | % |  |  | 39.93 | %
Russell 2000 Index |  |  | 16.26 | % |  |  | 16.77 | % |  |  | 16.75 | %
Correlation coefficient (b) |  |  | 0.19 |  |  |  | 0.22 |  |  | 0.32 |
Risk-free interest rate (c) |  |  | 2.61 | % |  |  | 1.44 | % |  |  | 0.93 | %
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 for Unvested RSUs and PSUs | A summary of activity for unvested RSUs and PSUs for fiscal years 2018, 2017, and 2016 is as follows:
|  | For the Year Ended April 30, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  |  |  |  |  | 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 period |  |  | 1,428,848 |  |  | $ | 18.58 |  |  |  | 1,215,753 |  |  | $ | 15.38 |  |  |  | 1,190,879 |  |  | $ | 12.45 |
Awarded |  |  | 561,890 |  |  |  | 15.09 |  |  |  | 666,509 |  |  |  | 19.85 |  |  |  | 541,077 |  |  |  | 17.72 |
Vested |  |  | (300,496 | ) |  |  | 16.53 |  |  |  | (433,966 | ) |  |  | 11.64 |  |  |  | (430,768 | ) |  |  | 10.57 |
Forfeited |  |  | (247,925 | ) |  |  | 17.04 |  |  |  | (19,448 | ) |  |  | 17.19 |  |  |  | (85,435 | ) |  |  | 10.94 |
RSUs and PSUs outstanding, end of period |  |  | 1,442,317 |  |  | $ | 17.80 |  |  |  | 1,428,848 |  |  | $ | 18.58 |  |  |  | 1,215,753 |  |  | $ | 15.38 |
Schedule of Assumptions used in Valuing ESPP Purchases | The following assumptions were used in valuing our ESPP purchases during the years ended April 30, 2018, 2017, and 2016:
| For the Years Ended April 30, |
| 2018 |  |  | 2017 |  |  | 2016 |
Risk-free interest rate |  | 1.62 | % |  |  | 0.60 | % |  |  | 0.19 | %
Expected term | 6 months |  |  | 6 months |  |  | 6 months |
Expected volatility |  | 42.3 | % |  |  | 45.3 | % |  |  | 40.9 | %
Dividend yield |  | 0 | % |  |  | 0 | % |  |  | 0 | %

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&loc=d3e5070-113901 + Details
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