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Acquisitions - Summary of Business Acquisitions Purchase Price Allocation (Detail) - USD ($) $ in Thousands | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 169,017 | $ 76,357 | $ 75,426
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable | 11,490 |  |
Inventories | 31,722 |  |
Income tax receivable | 68 |  |
Other current assets | 298 |  |
Property, plant, and equipment | 8,232 |  |
Intangibles | 97,850 |  |
Goodwill | 92,660 |  |
Total assets acquired | 242,320 |  |
Accounts payable | 6,232 |  |
Accrued expenses | 1,101 |  |
Accrued payroll | 1,402 |  |
Accrued warranty | 194 |  |
Deferred income taxes | 20,623 |  |
Total liabilities assumed | 29,552 |  |
Net assets acquired | 212,768 |  |
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc. | As Initially Reported |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable | 11,635 |  |
Inventories | 31,269 |  |
Other current assets | 430 |  |
Property, plant, and equipment | 8,232 |  |
Intangibles | 97,850 |  |
Goodwill | 92,801 |  |
Total assets acquired | 242,217 |  |
Accounts payable | 6,214 |  |
Accrued expenses | 973 |  |
Accrued payroll | 1,500 |  |
Accrued income taxes | 6 |  |
Accrued warranty | 98 |  |
Deferred income taxes | 20,658 |  |
Total liabilities assumed | 29,449 |  |
Net assets acquired | 212,768 |  |
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc. | Measurement Period Adjustments |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable | (145) |  |
Inventories | 453 |  |
Income tax receivable | 68 |  |
Other current assets | (132) |  |
Goodwill | (141) |  |
Total assets acquired | 103 |  |
Accounts payable | 18 |  |
Accrued expenses | 128 |  |
Accrued payroll | (98) |  |
Accrued income taxes | (6) |  |
Accrued warranty | 96 |  |
Deferred income taxes | (35) |  |
Total liabilities assumed | $ 103 |  |

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