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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	4 Months Ended	8 Months Ended	12 Months Ended
	Jan. 31, 2018	Apr. 30, 2018	Dec. 31, 2017	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Income Tax Contingency [Line Items]
U.S federal income tax rate		21.00%	35.00%	30.40%	35.00%	35.00%
Income tax benefit by effect of tax reform	$ 9,400,000			$ 8,700,000
Effective income tax rate, provisions (benefit)				(14.30%)	33.20%
Effective income tax rate, excluding impact of tax reform and other discrete items				35.40%
Gross tax-effected unrecognized tax benefits		$ 0		$ 0	$ 0
Smith And Wesson Security Solutions Inc
Income Tax Contingency [Line Items]
Net operating loss carryforwards		8,200,000		$ 8,200,000
Acquisition date				Jul. 20, 2009
Operating carryforward limited in year one		108,000		$ 108,000
Operating carryforward limited in each year thereafter		108,000		108,000
Federal
Income Tax Contingency [Line Items]
Net operating loss carryforwards		216,000		$ 216,000
Operating loss carry forwards expiration year				2020
Valuation allowance deferred federal income tax assets		0		$ 0	0
State
Income Tax Contingency [Line Items]
Net operating loss carryforwards		17,900,000		17,900,000	17,100,000
Tax credit carryforwards		3,100,000		3,100,000	3,200,000
Valuation allowances for net operating loss carryforward		921,000		921,000	720,000
Valuation allowances for tax credits		$ 2,400,000		$ 2,400,000	$ 2,100,000
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, 2037
State tax credit carryforwards expire date				Apr. 30, 2026