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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Income Tax Contingency [Line Items]    
Gross tax-effected unrecognized tax benefits $ 0 $ 0
Smith And Wesson Security Solutions Inc    
Income Tax Contingency [Line Items]    
Net operating loss carryforwards $ 8,200,000  
Acquisition date Jul. 20, 2009  
Operating carryforward limited in year one   108,000
Operating carryforward limited in each year thereafter   108,000
Federal    
Income Tax Contingency [Line Items]    
Net operating loss carryforwards $ 324,000  
Operating loss carry forwards expiration year 2020  
Valuation allowance deferred federal income tax assets $ 0 0
State    
Income Tax Contingency [Line Items]    
Net operating loss carryforwards 17,100,000 16,800,000
Tax credit carryforwards 3,200,000 2,900,000
Valuation allowances for net operating loss carryforward 720,000 708,000
Valuation allowances for tax credits $ 2,100,000 $ 1,900,000
State | Minimum    
Income Tax Contingency [Line Items]    
Operating loss carry forwards expiration dates Apr. 30, 2025  
State tax credit carryforwards expire date Apr. 30, 2020  
State | Maximum    
Income Tax Contingency [Line Items]    
Operating loss carry forwards expiration dates Apr. 30, 2036  
State tax credit carryforwards expire date Apr. 30, 2025