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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