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Acquisitions - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Aug. 31, 2017 USD ($) Transaction | Apr. 30, 2018 USD ($) | Jan. 31, 2018 USD ($) | Oct. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) | Apr. 30, 2017 USD ($) | Jan. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) | Jul. 31, 2016 USD ($) | Apr. 30, 2018 USD ($) | Apr. 30, 2017 USD ($) Transaction | Apr. 30, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business, net of cash acquired |  |  |  |  |  |  |  |  |  | $ 23,120,000 |  | $ 211,069,000 |  | $ 1,220,000 |
Reduction in fair value of contingent consideration liability |  |  |  |  |  |  |  |  |  | 1,640,000 |  |  |  |  |
Net sales |  | $ 172,026,000 | $ 157,376,000 | $ 148,427,000 | $ 129,021,000 | $ 229,186,000 | $ 233,523,000 | $ 233,528,000 | $ 206,951,000 | 606,850,000 | [1] | 903,188,000 | [1] | $ 722,908,000 | [1]
Gemini Technologies, Incorporated and Bubba Blade Branded Products from Fish Tales, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business, net of cash acquired | $ 23,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of transactions for acquisition | Transaction | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, acquisition-related costs |  |  |  |  |  |  |  |  |  | 769,000 |  |  |  |  |
Gemini Technologies, Incorporated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration maximum payout | $ 17,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, contingent consideration payable performance period | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination contingent consideration liability non-current |  | 100,000 |  |  |  |  |  |  |  | 100,000 |  |  |  |  |
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  | $ 211,100,000 |  |  |
Number of transactions for acquisition | Transaction |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Business combination, acquisition-related costs |  |  |  |  |  |  |  |  |  |  |  | $ 3,800,000 |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | $ 61,100,000 |  |  |
Ultimate Survival Technologies, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, contingent consideration payable performance period |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |
Business combination contingent consideration liability non-current |  | 60,000 |  |  |  |  |  |  |  | 60,000 |  |  |  |  |
Contingent consideration payable upon financial performance of acquired business |  |  |  |  |  | 1,700,000 |  |  |  |  |  | $ 1,700,000 |  |  |
Reduction in fair value of contingent consideration liability |  |  |  |  |  |  |  |  |  | 1,600,000 |  |  |  |  |
Business combination contingent consideration liability current |  | $ 60,000 |  |  |  |  |  |  |  | 60,000 |  |  |  |  |
Ultimate Survival Technologies, Inc. | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration payable upon financial performance of acquired business |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  | $ 2,000,000 |  |  |
Taylor Brands, LLC and Crimson Trace Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination decrease in goodwill |  |  |  |  |  |  |  |  |  | 10,100,000 |  |  |  |  |
Business combination reduction in amortization expense, net of tax |  |  |  |  |  |  |  |  |  | $ 476,000 |  |  |  |  |
[1] | For the years ended April 30, 2018, 2017, and 2016, we allocated all of corporate overhead expenses except for interest and income taxes, such as general and administrative expenses and other corporate-level expenses, to both our Firearms and Outdoor Products & Accessories segments.

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