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Segment Reporting - Schedule of Results by Business Segment (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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total 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 |
Gross margin |  | 90,787 | 99,311 | 97,605 | 87,569 | 92,069 | 86,658 | 56,215 | 58,870 | 375,272 | [1] | 293,812 | [1] | 194,926 | [1]
Operating income/(loss) | [1] |  |  |  |  |  |  |  |  | 199,939 |  | 158,643 |  | 89,628 |
Income tax expense/(benefit) | [1] |  |  |  |  |  |  |  |  | 63,452 |  | 51,135 |  | 28,905 |
Gross profit |  | $ 90,787 | $ 99,311 | $ 97,605 | $ 87,569 | $ 92,069 | $ 86,658 | $ 56,215 | $ 58,870 | 375,272 | [1] | 293,812 | [1] | 194,926 | [1]
Income tax expense | [1] |  |  |  |  |  |  |  |  | 63,452 |  | 51,135 |  | 28,905 |
Outdoor Products & Accessories Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales | [1] |  |  |  |  |  |  |  |  | 130,191 |  | 70,843 | [2] | 20,640 |
Firearms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales | [1] |  |  |  |  |  |  |  |  | 772,997 |  | 652,065 | [2] | 531,222 |
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales | [1] |  |  |  |  |  |  |  |  | (14,173) |  | (2,564) |  |  |
Cost of sales | [1] |  |  |  |  |  |  |  |  | (11,840) |  | (2,558) |  |  |
Gross margin | [1] |  |  |  |  |  |  |  |  | (2,332) |  | (6) |  |  |
Operating income/(loss) | [1] |  |  |  |  |  |  |  |  | 50,233 |  | 18,605 |  | 15,040 |
Gross profit | [1] |  |  |  |  |  |  |  |  | (2,332) |  | (6) |  |  |
Intersegment Eliminations | Outdoor Products & Accessories Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales | [1] |  |  |  |  |  |  |  |  | 10,530 |  | 743 |  |  |
Intersegment Eliminations | Firearms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales | [1] |  |  |  |  |  |  |  |  | 3,643 |  | 1,821 |  |  |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales | [1] |  |  |  |  |  |  |  |  | 903,188 |  | 722,908 |  | 551,862 |
Operating Segments | Outdoor Products & Accessories Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales | [1] |  |  |  |  |  |  |  |  | 140,721 |  | 71,586 |  | 20,640 |
Cost of sales | [1] |  |  |  |  |  |  |  |  | 75,737 | [3] | 37,536 | [2] | 14,273 | [4]
Gross margin | [1] |  |  |  |  |  |  |  |  | 64,985 |  | 34,051 |  | 6,367 |
Operating income/(loss) | [1] |  |  |  |  |  |  |  |  | (3,949) | [5] | 3,511 |  | (3,505) | [6]
Income tax expense/(benefit) | [1] |  |  |  |  |  |  |  |  | (2,300) |  | 1,006 |  | (1,133) |
Gross profit | [1] |  |  |  |  |  |  |  |  | 64,985 |  | 34,051 |  | 6,367 |
Income tax expense | [1] |  |  |  |  |  |  |  |  | (2,300) |  | 1,006 |  | (1,133) |
Operating Segments | Firearms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Net Sales | [1] |  |  |  |  |  |  |  |  | 776,640 |  | 653,886 |  | 531,222 |
Cost of sales | [1] |  |  |  |  |  |  |  |  | 464,019 |  | 394,118 | [2] | 342,663 |
Gross margin | [1] |  |  |  |  |  |  |  |  | 312,619 |  | 259,767 |  | 188,559 |
Operating income/(loss) | [1] |  |  |  |  |  |  |  |  | 201,442 |  | 153,728 |  | 91,788 |
Income tax expense/(benefit) | [1] |  |  |  |  |  |  |  |  | 77,585 |  | 58,103 |  | 35,427 |
Gross profit | [1] |  |  |  |  |  |  |  |  | 312,619 |  | 259,767 |  | 188,559 |
Income tax expense | [1] |  |  |  |  |  |  |  |  | 77,585 |  | 58,103 |  | 35,427 |
Corporate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income/(loss) | [1] |  |  |  |  |  |  |  |  | (47,787) |  | (17,201) |  | (13,695) |
Income tax expense/(benefit) | [1] |  |  |  |  |  |  |  |  | (11,833) |  | (7,974) |  | (5,389) |
Income tax expense | [1] |  |  |  |  |  |  |  |  | $ (11,833) |  | $ (7,974) |  | $ (5,389) |
[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.
[3] | Amount includes $4.7 million of additional cost of goods sold from the fair value inventory step-up and backlog expense related to the 2017 Acquisitions.
[4] | Amount includes $4.2 million of additional cost of goods sold from the fair value inventory step-up related to the BTI Acquisition.
[5] | Amount includes $18.4 million of amortization of intangible assets identified as a result of our acquisitions.
[6] | Amount includes $3.6 million of amortization of intangible assets identified as a result of the BTI Acquisition.

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