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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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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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