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Employer Sponsored Benefit Plans - Additional Information (Detail)
12 Months Ended
Apr. 30, 2021
USD ($)
Apr. 30, 2020
USD ($)
InvestmentPlan
Apr. 30, 2019
USD ($)
Contributory Defined Investment Plan      
Defined Contribution Plan Disclosure [Line Items]      
Defined contribution plan, matching contribution percentage 6.00%    
Employer contribution to defined benefit plan $ 461,000    
Contributory Defined Investment Plan | Smith & Wesson Brands, Inc.      
Defined Contribution Plan Disclosure [Line Items]      
Employer contribution to defined benefit plan   $ 215,000 $ 384,000
Number of contributory defined investment plan | InvestmentPlan   2  
Deferred compensation plan description Prior to the Separation, our employees participated in two contributory defined investment plans sponsored by our former parent, subject to service requirements.  For one plan, employees could contribute up to 100% of their annual pay with no employer matching contributions. For the other plan, employees could contribute from 1% to 30% of their annual pay and our former parent generally made discretionary matching contributions of up to 50% of the first 6% of employee contributions to the plan.    
Contributory Defined Investment Plan | Smith & Wesson Brands, Inc. | Retirement Plan One      
Defined Contribution Plan Disclosure [Line Items]      
Defined contribution plan, employee contribution percentage   100.00%  
Defined contribution plan, matching contribution percentage   0.00%  
Contributory Defined Investment Plan | Smith & Wesson Brands, Inc. | Retirement Plan Two      
Defined Contribution Plan Disclosure [Line Items]      
Defined contribution plan, matching contribution percentage   6.00%  
Contributory Defined Investment Plan | Minimum      
Defined Contribution Plan Disclosure [Line Items]      
Defined contribution plan, employee contribution percentage 1.00%    
Contributory Defined Investment Plan | Minimum | Smith & Wesson Brands, Inc. | Retirement Plan Two      
Defined Contribution Plan Disclosure [Line Items]      
Defined contribution plan, employee contribution percentage   1.00%  
Contributory Defined Investment Plan | Maximum      
Defined Contribution Plan Disclosure [Line Items]      
Defined contribution plan, employee contribution percentage 30.00%    
Defined contribution plan, matching contribution percentage of match 50.00%    
Contributory Defined Investment Plan | Maximum | Smith & Wesson Brands, Inc. | Retirement Plan Two      
Defined Contribution Plan Disclosure [Line Items]      
Defined contribution plan, employee contribution percentage   30.00%  
Defined contribution plan, matching contribution percentage of match   50.00%  
Non-Contributory Profit Sharing Plan      
Defined Contribution Plan Disclosure [Line Items]      
Defined contribution plan service period 1 year    
Defined contribution plan expected contribution $ 1,900,000 $ 217,000 $ 278,000