Document and Entity Information - shares	6 Months Ended
	Oct. 31, 2021	Nov. 30, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Entity Registrant Name	Smith & Wesson Brands, Inc.
Entity Central Index Key	0001092796
Current Fiscal Year End Date	--04-30
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	001-31552
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 Address, State or Province	MA
Entity Address, Postal Zip Code	01104
City Area Code	800
Local Phone Number	331-0852
Document Quarterly Report	true
Document Transition Report	false
Entity Common Stock, Shares Outstanding		48,294,677
Title of each Class	Common Stock, par value $0.001 per share
Trading Symbol	SWBI
Name of exchange on which registered	NASDAQ