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Segment Reporting - Schedule of Results by Business Segment (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense of intangible assets |  |  |  |  |  |  |  |  |  | $ 21,000 |  | $ 20,100 |  | $ 10,700 |
Income tax benefit by effect of tax reform |  |  | $ 9,400 |  |  |  |  |  |  | 8,700 |  |  |  |  |
Net sales |  | $ 172,026 | $ 157,376 | $ 148,427 | $ 129,021 | $ 229,186 | $ 233,523 | $ 233,528 | $ 206,951 | 606,850 | [1] | 903,188 | [1] | 722,908 | [1]
Cost of sales | [1] |  |  |  |  |  |  |  |  | 411,098 |  | 527,916 |  | 429,096 |
Outdoor Products & Accessories Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | [1] |  |  |  |  |  |  |  |  | 157,864 |  | 130,191 |  | 70,843 | [2]
Outdoor Products & Accessories Segment | Transition Reclassified |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,600 |
Cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,600 |
Gemini Technologies, Incorporated and Bubba Blade Branded Products from Fish Tales, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional cost of goods sold |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |
Amortization expense of intangible assets |  |  |  |  |  |  |  |  |  | $ 20,800 |  |  |  |  |
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional cost of goods sold |  |  |  |  |  |  |  |  |  |  |  | 4,700 |  |  |
Amortization expense of intangible assets |  |  |  |  |  |  |  |  |  |  |  | 18,400 |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | $ 61,100 |  |  |
[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.
[2] | Effective October 1, 2015, our Thompson/Center accessories business was transitioned from our Firearms segment to our Outdoor Products & Accessories segment. As a result of the transition, we have reclassified $5.6 million and $4.6 million of revenue and cost of sales, respectively, from the Firearms segment to the Outdoor Products & Accessories segment for the year ended April 30, 2016.

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