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Self-Insurance Reserves - Summary of Other Liabilities (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020
Commitments And Contingencies Disclosure [Abstract] |  |
Beginning balance | $ 9,011 | $ 8,423
Additional provision charged to expense | 2,484 | 19,608
Payments | (2,026) | (19,020)
Ending balance | $ 9,469 | $ 9,011

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- Definition Self insurance reserve, deductions. + References No definition available. + Details
Name: | swbi_SelfInsuranceReserveDeductions
Namespace Prefix: | swbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Self-insurance reserves expense. + References No definition available. + Details
Name: | swbi_SelfInsuranceReservesExpense
Namespace Prefix: | swbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_SelfInsuranceReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant