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Net Sales - Additional Information (Detail)	12 Months Ended
	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%

X

- 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

X

- 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