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Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2017 USD ($) | Apr. 30, 2017 USD ($) Segment | Apr. 30, 2016 USD ($) | Apr. 30, 2015 USD ($) shares
Product Information [Line Items] |  |  |  |
Maximum maturity period of all highly liquid investments to be considered cash equivalents |  | 3 months |  |
Number of reportable segments | Segment |  | 2 |  |
Long-lived assets impairment charges |  | $ 0 | $ 0 | $ 0
Intangible assets impairment charges |  | 0 | 0 | 0
Goodwill | $ 169,017,000 | 169,017,000 | 76,357,000 | 75,426,000
Remaining cost related to recalls and safety alerts costs |  | 1,500,000 |  |
Reduction in warranty accrual for recalls |  | 2,437,000 |  |
Warranty expense |  | 1,300,000 | 2,500,000 | 4,300,000
Promotional programs amount |  | 37,300,000 | 20,700,000 | 6,900,000
Selling and marketing expenses |  | 21,300,000 | 6,500,000 | $ 2,800,000
Self Insurance |  |  |  |
Product Information [Line Items] |  |  |  |
Maximum amount of self-insurance per occurrence | 10,000,000 | 10,000,000 |  |
Thompson/Center Arms |  |  |  |
Product Information [Line Items] |  |  |  |
Remaining cost related to recalls and safety alerts costs |  | $ 708,000 |  |
Reduction in warranty accrual for recalls | 2,400,000 |  |  |
2011 ESPP |  |  |  |
Product Information [Line Items] |  |  |  |
Number of common stock issuable with antidilutive effect | shares |  |  |  | 73,546
Outdoor Products & Accessories Segment |  |  |  |
Product Information [Line Items] |  |  |  |
Number of reportable segments | Segment |  | 1 |  |
Number of operating segments | Segment |  | 2 |  |
Goodwill | 155,247,000 | $ 155,247,000 | 62,587,000 | $ 61,656,000
Firearms Segment |  |  |  |
Product Information [Line Items] |  |  |  |
Number of reportable segments | Segment |  | 1 |  |
Number of operating segments | Segment |  | 1 |  |
Goodwill | 13,770,000 | $ 13,770,000 | $ 13,770,000 | $ 13,770,000
Goodwill impairment |  | 0 |  |
Accessories |  |  |  |
Product Information [Line Items] |  |  |  |
Goodwill | $ 109,900,000 | $ 109,900,000 |  |
Percentage of fair value in excess of carrying value of goodwill | 16.00% | 16.00% |  |
Goodwill impairment |  | $ 0 |  |
Electro-Optics |  |  |  |
Product Information [Line Items] |  |  |  |
Goodwill | $ 45,300,000 | $ 45,300,000 |  |
Percentage of fair value in excess of carrying value of goodwill | 11.00% | 11.00% |  |
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 |  | 10.00% | 10.00% | 10.00%
Customer One | Accounts Receivable |  |  |  |
Product Information [Line Items] |  |  |  |
Concentration of risk, percentage |  | 17.50% | 10.00% | 10.00%
5.000% Senior Notes due 2018 |  |  |  |
Product Information [Line Items] |  |  |  |
Debt instrument, interest rate | 5.00% | 5.00% |  | 5.00%

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