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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 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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