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Acquisitions - Identifiable Intangible Assets Acquired and Respective Weighted Average Lives (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Acquired Finite Lived Intangible Assets [Line Items]    
Total intangible assets, gross $ 172,213 $ 179,759
Weighted Average Life (In years) 5 years  
Developed technology    
Acquired Finite Lived Intangible Assets [Line Items]    
Total intangible assets, gross $ 21,130 19,430
Weighted Average Life (In years) 6 years  
Customer relationships    
Acquired Finite Lived Intangible Assets [Line Items]    
Total intangible assets, gross [1] $ 92,360 105,260
Weighted Average Life (In years) 5 years  
Order backlog    
Acquired Finite Lived Intangible Assets [Line Items]    
Total intangible assets, gross $ 1,150 $ 1,150
Gemini Technologies, Incorporated and Bubba Blade Branded Products from Fish Tales, LLC    
Acquired Finite Lived Intangible Assets [Line Items]    
Total intangible assets, gross 6,400  
Gemini Technologies, Incorporated and Bubba Blade Branded Products from Fish Tales, LLC | Developed technology    
Acquired Finite Lived Intangible Assets [Line Items]    
Total intangible assets, gross $ 1,700  
Weighted Average Life (In years) 5 years 10 months 24 days  
Gemini Technologies, Incorporated and Bubba Blade Branded Products from Fish Tales, LLC | Customer relationships    
Acquired Finite Lived Intangible Assets [Line Items]    
Total intangible assets, gross $ 1,600  
Weighted Average Life (In years) 5 years 2 months 12 days  
Gemini Technologies, Incorporated and Bubba Blade Branded Products from Fish Tales, LLC | Trade names    
Acquired Finite Lived Intangible Assets [Line Items]    
Total intangible assets, gross $ 3,100  
Weighted Average Life (In years) 5 years 7 months 6 days  
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc.    
Acquired Finite Lived Intangible Assets [Line Items]    
Total intangible assets, gross $ 83,350  
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc. | Developed technology    
Acquired Finite Lived Intangible Assets [Line Items]    
Total intangible assets, gross $ 3,000  
Weighted Average Life (In years) 4 years 1 month 6 days  
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc. | Customer relationships    
Acquired Finite Lived Intangible Assets [Line Items]    
Total intangible assets, gross $ 62,100  
Weighted Average Life (In years) 5 years  
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc. | Trade names    
Acquired Finite Lived Intangible Assets [Line Items]    
Total intangible assets, gross $ 17,000  
Weighted Average Life (In years) 4 years 9 months 18 days  
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc. | Order backlog    
Acquired Finite Lived Intangible Assets [Line Items]    
Total intangible assets, gross $ 1,150  
Weighted Average Life (In years) 3 months 18 days  
Taylor Brands, LLC, Crimson Trace Corporation and Ultimate Survival Technologies, Inc. | Non-competition agreement    
Acquired Finite Lived Intangible Assets [Line Items]    
Total intangible assets, gross $ 100  
Weighted Average Life (In years) 3 years 4 months 24 days  
[1] Changes to the gross carrying amount of customer relationships is related to purchase accounting adjustments. For more information regarding the changes in valuation of customer relations, see Note 2 — Acquisitions to our consolidated financial statements.