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Acquisitions - Additional Information (Detail)
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2017
USD ($)
Transaction
Apr. 30, 2018
USD ($)
Jan. 31, 2018
USD ($)
Oct. 31, 2017
USD ($)
Jul. 31, 2017
USD ($)
Apr. 30, 2017
USD ($)
Jan. 31, 2017
USD ($)
Oct. 31, 2016
USD ($)
Jul. 31, 2016
USD ($)
Apr. 30, 2018
USD ($)
Apr. 30, 2017
USD ($)
Transaction
Apr. 30, 2016
USD ($)
Business Acquisition [Line Items]                        
Payments to acquire business, net of cash acquired                   $ 23,120,000 $ 211,069,000 $ 1,220,000
Reduction in fair value of contingent consideration liability                   1,640,000    
Net sales   $ 172,026,000 $ 157,376,000 $ 148,427,000 $ 129,021,000 $ 229,186,000 $ 233,523,000 $ 233,528,000 $ 206,951,000 606,850,000 [1] 903,188,000 [1] $ 722,908,000 [1]
Gemini Technologies, Incorporated and Bubba Blade Branded Products from Fish Tales, LLC                        
Business Acquisition [Line Items]                        
Payments to acquire business, net of cash acquired $ 23,100,000                      
Number of transactions for acquisition | Transaction 2                      
Business combination, acquisition-related costs                   769,000    
Gemini Technologies, Incorporated                        
Business Acquisition [Line Items]                        
Contingent consideration maximum payout $ 17,100,000                      
Business combination, contingent consideration payable performance period 3 years                      
Business combination contingent consideration liability non-current   100,000               100,000    
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  
Number of transactions for acquisition | Transaction                     3  
Business combination, acquisition-related costs                     $ 3,800,000  
Net sales                     $ 61,100,000  
Ultimate Survival Technologies, Inc.                        
Business Acquisition [Line Items]                        
Business combination, contingent consideration payable performance period                     2 years  
Business combination contingent consideration liability non-current   60,000               60,000    
Contingent consideration payable upon financial performance of acquired business           1,700,000         $ 1,700,000  
Reduction in fair value of contingent consideration liability                   1,600,000    
Business combination contingent consideration liability current   $ 60,000               60,000    
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                   10,100,000    
Business combination reduction in amortization expense, net of tax                   $ 476,000    
[1] For the years ended April 30, 2018, 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.