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v3.21.1

Stockholders' Equity - Share Based Payment Award Performance Shares Valuation Assumptions (Parenthetical) (Detail) | 12 Months Ended
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Apr. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Performance based restricted stock unit performance period | 3 years
PSUs |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Performance based restricted stock unit performance period | 3 years

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- Definition Share based compensation arrangement by share based payment award performance period. + References No definition available. + Details
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Namespace Prefix: | swbi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |