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Acquisitions - Unaudited Pro Forma Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
BTI Acquisition |  |  |
Business Acquisition [Line Items] |  |  |
Net sales |  |  | $ 582,875
Income from continuing operations |  |  | $ 53,388
Net income per share - diluted |  |  | $ 0.97
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Net sales | $ 934,247 | $ 816,699 |
Income from continuing operations | $ 195,295 | $ 151,258 |
Net income per share - diluted | $ 2.30 | $ 1.80 |

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