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Segment Reporting - Schedule of Results by Business Segment (Parenthetical) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 30, 2018
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Segment Reporting Information [Line Items]                      
Amortization expense of intangible assets                 $ 21,000 $ 20,100 $ 10,700
Income tax benefit by effect of tax reform   $ 9,400             8,700    
Net sales $ 172,026 $ 157,376 $ 148,427 $ 129,021 $ 229,186 $ 233,523 $ 233,528 $ 206,951 606,850 [1] 903,188 [1] 722,908 [1]
Cost of sales [1]                 411,098 527,916 429,096
Outdoor Products & Accessories Segment                      
Segment Reporting Information [Line Items]                      
Net sales [1]                 157,864 130,191 70,843 [2]
Outdoor Products & Accessories Segment | Transition Reclassified                      
Segment Reporting Information [Line Items]                      
Net sales                     5,600
Cost of sales                     $ 4,600
Gemini Technologies, Incorporated and Bubba Blade Branded Products from Fish Tales, LLC                      
Segment Reporting Information [Line Items]                      
Additional cost of goods sold                 500,000    
Amortization expense of intangible assets                 $ 20,800    
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc.                      
Segment Reporting Information [Line Items]                      
Additional cost of goods sold                   4,700  
Amortization expense of intangible assets                   18,400  
Net sales                   $ 61,100  
[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.
[2] Effective October 1, 2015, our Thompson/Center accessories business was transitioned from our Firearms segment to our Outdoor Products & Accessories segment. As a result of the transition, we have reclassified $5.6 million and $4.6 million of revenue and cost of sales, respectively, from the Firearms segment to the Outdoor Products & Accessories segment for the year ended April 30, 2016.