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Segment Reporting - Schedule of Results by Business Segment (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ 229,186 | $ 233,523 | $ 233,528 | $ 206,951 | $ 221,117 | $ 210,786 | $ 143,242 | $ 147,763 | $ 903,188 | [1] | $ 722,908 | [1] | $ 551,862 | [1]
Cost of sales | [1] |  |  |  |  |  |  |  |  | 527,916 |  | 429,096 |  | 356,936 |
Amortization expense of intangible assets |  |  |  |  |  |  |  |  |  | 20,100 |  | 10,700 |  | 4,600 |
Taylor Brands LLC and Crimson Trace Corporation and Ultimate Survival Technologies Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 61,100 |  |  |  |  |
Additional cost of goods sold |  |  |  |  |  |  |  |  |  | 4,700 |  |  |  |  |
Amortization expense of intangible assets |  |  |  |  |  |  |  |  |  | 18,400 |  |  |  |  |
BTI Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,200 |
Amortization expense of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,600 |
Outdoor Products & Accessories Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | [1] |  |  |  |  |  |  |  |  | $ 130,191 |  | 70,843 | [2] | $ 20,640 |
Outdoor Products & Accessories Segment | Transition Reclassified |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 5,600 |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  |  |  | $ 4,600 |  |  |
[1] | For the years ended April 30, 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. For the year ended April 30, 2015, segment information herein has been restated from that previously presented to allocate corporate overhead expenses on the same basis. Corporate overhead expenses were not previously allocated for the year ended April 30, 2015 due to the timing of the BTI Acquisition.
[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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