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Stockholders' Equity - Additional Information (Detail)		12 Months Ended
	May 01, 2021 USD ($) shares	Apr. 30, 2021 USD ($) OptionPlan shares	Apr. 30, 2020 USD ($) shares		Apr. 30, 2019 USD ($) shares	Mar. 02, 2021 USD ($)	Aug. 24, 2020 shares	Apr. 30, 2018 shares	Sep. 23, 2013 shares	Sep. 26, 2011 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock incentive plans | OptionPlan		2
Stock options, outstanding, Number		0	200,667		267,761			316,160
Stock options exercisable, Number		0	200,667		267,761
Intrinsic value of stock outstanding | $			$ 356,000		$ 826,000
Intrinsic value of stock exercisable | $			356,000		826,000
Intrinsic value of stock exercised | $		$ 2,900,000	260,000		285,000
Performance period		3 years
Percentage of maximum aggregate award granted		200.00%
Percentage of stock outperform in order for target award to vest		5.00%
Stock-based compensation expense | $		$ 4,706,000	2,357,000	[1]	6,947,000
Grant date fair value of vested RSUs and PSUs | $		$ 5,900,000	$ 5,000,000.0		$ 3,900,000
2011 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option exercise price per share as a percentage of fair market value		85.00%
Number of shares an employee may purchase under the stock purchase plan		12,500
Fair market value of shares an employee may purchase under the stock purchase plan | $		$ 25,000
Shares issued under employee stock purchase plan		204,482	380,209		230,282
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded		234,007	400,483		360,185
Stock units, forfeited		88,365	232,793		33,899
Grant date fair value of vested RSUs and PSUs | $		$ 5,800,000	$ 2,600,000		$ 2,500,000
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period		3 years
Stock units, forfeited		92,500	367,025		112,000
RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense | $		$ 2,700,000
Stock units, awarded		270,315	578,300		541,785
Stock units, forfeited		180,865	599,818		145,899
Stock units, vested		407,545	296,139		206,572
Weighted average remaining contractual term		1 year 4 months 24 days
Employees | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, vested		357,345	296,139		206,572
Directors | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		1 year
Vesting, percentage		0.083%
Stock units, awarded		25,570	115,600		49,509
Former Chief Financial Officer | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PSUs converted to RSUs		50,200
Former Chief Financial Officer | PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, vested		50,200
Grant date fair value of vested RSUs and PSUs | $		$ 1,300,000
Executive Officer | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded		68,461	113,770		167,818
Executive Officer | PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded		36,308	105,767		181,600
Non-Executive Officer Employees | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded		139,976	211,073		142,858
Non-Executive Officer Employees | PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, awarded			32,050
Employees And Consultants | RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $		$ 3,400,000	$ 2,300,000		$ 7,300,000
Spin-off | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, forfeited		57,547
Spin-off | PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, forfeited		28,800
Spin-off | American Outdoor Brands Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, outstanding, Number							1
Stock option conversion description		one option award outstanding that could be converted into 10,000 shares of SWBI common stock
Unrecognized compensation expense | $		$ 1,100,000
Incremental compensation cost recognized | $		738,000
Spin-off | American Outdoor Brands Inc. | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense | $		740,000
Spin-off | American Outdoor Brands Inc. | PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized incremental compensation expense | $		$ 380,000
Service Period Condition not Met | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, forfeited		30,818
Performance Targets not Achieved | PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units, forfeited		63,700
2013 Incentive Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized of common stock									3,000,000
Vesting period		4 years
Stock option, exercisable period		10 years
Shares available for grant under incentive stock option		3,967,603
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payroll deduction of participant's compensation		20.00%
Maximum | 2011 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved under employee stock purchase plan										6,000,000
Maximum | Employees | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		4 years
Vesting, percentage		0.25%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payroll deduction of participant's compensation		1.00%
Minimum | Employees | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Vesting, percentage		0.33%
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under employee stock purchase plan		205,000	380,000		231,000
Common Stock | Transactions Until December 14, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of common stock		2,737,489
Cash on hand utilized for repurchase of shares | $		$ 50,000,000.0
Common Stock | Transaction Until March 1, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase authorization | $						$ 100,000,000.0
Repurchase of common stock		3,380,447
Cash on hand utilized for repurchase of shares | $		$ 60,000,000.0
Common Stock | Transaction Until March 1, 2022 | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of common stock	1,967,420
Cash on hand utilized for repurchase of shares | $	$ 40,000,000.0
Common Stock | Maximum | Transactions Until December 14, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase authorization | $		$ 50,000,000.0
[1] The decrease in general and administrative stock-based compensation expense from fiscal 2019 was because of the separation of our former President and Chief Executive Officer.

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