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Acquisitions - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 09, 2015 | Dec. 11, 2014 | May 05, 2014 | 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 | Nov. 25, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  | $ 211,069,000 |  | $ 1,220,000 |  | $ 159,242,000 |  |
Net sales |  |  |  | $ 229,186,000 | $ 233,523,000 | $ 233,528,000 | $ 206,951,000 | $ 221,117,000 | $ 210,786,000 | $ 143,242,000 | $ 147,763,000 | 903,188,000 | [1] | $ 722,908,000 | [1] | $ 551,862,000 | [1] |
DRP Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business, excluding working capital adjustment |  |  | $ 22,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Working capital adjustment |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business, net of cash acquired |  |  | $ 23,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Battenfeld Acquisition Company Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business, excluding working capital adjustment |  | $ 130,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Working capital adjustment |  | 3,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition payment made through line of credit |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Battenfeld Acquisition Company Inc | Amended Unsecured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000,000
B T I Acquisition Excluding Hooyman LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business, net of cash acquired |  | $ 133,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hooyman LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business, net of cash acquired | $ 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BTI Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  | 135,500,000 |  |  |  |  |  |
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  | 211,100,000 |  |  |  |  |  |
Business combination, acquisition-related costs |  |  |  |  |  |  |  |  |  |  |  | 3,800,000 |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 61,100,000 |  |  |  |  |  |
Ultimate Survival Technologies, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration payable upon financial performance of acquired business |  |  |  | 1,700,000 |  |  |  |  |  |  |  | $ 1,700,000 |  |  |  |  |  |
Business combination, contingent consideration payable performance period |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |
Business combination contingent consideration liability current |  |  |  | 900,000 |  |  |  |  |  |  |  | $ 900,000 |  |  |  |  |  |
Ultimate Survival Technologies, Inc. | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration payable upon financial performance of acquired business |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |
Taylor Brands, LLC and Crimson Trace Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination decrease in goodwill |  |  |  |  |  |  |  |  |  |  |  | $ 141,000 |  |  |  |  |  |
[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.

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