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Document and Entity Information - USD ($)
 12 Months Ended
Apr. 30, 2021
Jun. 15, 2021
Oct. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Apr. 30, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Registrant Name Smith & Wesson Brands, Inc.    
Entity Central Index Key 0001092796    
Current Fiscal Year End Date --04-30    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity File Number 1-31552    
Entity Incorporation, State or Country Code NV    
Entity Tax Identification Number 87-0543688    
Entity Address, Address Line One 2100 Roosevelt Avenue    
Entity Address, City or Town Springfield    
Entity Common Stock, Shares Outstanding   47,999,397  
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 01104    
City Area Code 800    
Local Phone Number 331-0852    
Document Annual Report true    
Document Transition Report false    
ICFR Auditor Attestation Flag false    
Entity Public Float     $ 919,699,515
Title of each Class Common Stock, Par Value $.001 per Share    
Trading Symbol SWBI    
Name of exchange on which registered NASDAQ    
Documents Incorporated by Reference

Portions of the registrant’s definitive proxy statement for the 2021 Annual Meeting of Stockholders are incorporated by reference into Part III of this Form 10-K.