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Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
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Apr. 30, 2019 USD ($) | Apr. 30, 2018 USD ($) Segment | Apr. 30, 2017 USD ($) | Apr. 30, 2016 USD ($) | Jul. 31, 2018 USD ($)
Product Information [Line Items] |  |  |  |  |
Maximum maturity period of all highly liquid investments to be considered cash equivalents |  | 3 months |  |  |
Adjustment to retained earnings |  | $ 389,146,000 | $ 369,164,000 |  |
Number of reporting segments | Segment |  | 2 |  |  |
Long-lived assets impairment charges |  | $ 0 | 0 | $ 0 |
Intangible assets impairment charges |  | 0 | 0 | 0 |
Goodwill |  | 191,287,000 | 169,017,000 | 76,357,000 |
Warranty expense |  | 5,800,000 | 1,300,000 | 2,500,000 |
Promotional programs amount |  | 58,200,000 | 37,300,000 | 20,700,000 |
Selling and marketing expenses |  | 23,300,000 | 21,300,000 | 6,500,000 |
Self Insurance |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Maximum amount of self-insurance per occurrence |  | 10,000,000 |  |  |
Thompson/Center Arms |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Remaining cost related to recalls, safety alerts, and consumer advisories |  | $ 3,500,000 |  |  |
Outdoor Products & Accessories Segment |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Number of reporting segments | Segment |  | 1 |  |  |
Number of operating segments | Segment |  | 2 |  |  |
Goodwill |  | $ 172,797,000 | 155,247,000 | 62,587,000 |
Outdoor Products & Accessories Segment | Outdoor Products & Accessories Division |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Goodwill |  | $ 119,800,000 |  |  |
Percentage of fair value in excess of carrying value of goodwill |  | 2.00% |  |  |
Goodwill impairment |  | $ 0 |  |  |
Outdoor Products & Accessories Segment | Electro-Optics Division |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Goodwill |  | $ 53,000,000 |  |  |
Percentage of fair value in excess of carrying value of goodwill |  | 1.60% |  |  |
Goodwill impairment |  | $ 0 |  |  |
Firearms Segment |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Number of reporting segments | Segment |  | 1 |  |  |
Number of operating segments | Segment |  | 1 |  |  |
Goodwill |  | $ 18,490,000 | $ 13,770,000 | $ 13,770,000 |
Goodwill impairment |  | $ 0 |  |  |
Other Capitalized Property Plant and Equipment | Maximum |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Estimated useful life |  | 10 years |  |  |
Customer One | Sales, net |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Concentration of risk, percentage |  | 11.90% | 10.00% | 10.00% |
Customer One | Accounts Receivable |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Concentration of risk, percentage |  | 10.00% | 17.50% | 10.00% |
ASU 2014-09 | Scenario, Forecast | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Adjustment to retained earnings |  |  |  |  | $ 5,500,000
Impact to revenue due to adoption of new standard | $ 22,500,000 |  |  |  |
2020 Senior Notes |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Debt instrument maturity year |  | 2020 |  |  |

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