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v3.21.1

Net Sales - Additional Information (Detail) | 12 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Disclosure Net Sales [Abstract] |  |  |
Export sales as percentage of revenue | 2.00% | 4.00% | 5.00%

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- Definition Disclosure net sales. + References No definition available. + Details
Name: | swbi_DisclosureNetSalesAbstract
Namespace Prefix: | swbi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Export sales as percentage of revenue. + References No definition available. + Details
Name: | swbi_ExportSalesAsPercentageOfRevenue
Namespace Prefix: | swbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration