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Commitments and Contingencies - Additional Information (Detail) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2018 USD ($)	Apr. 30, 2021 USD ($) Case Claim Plaintiff	Apr. 30, 2021 CAD ($) Case Claim Plaintiff	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)
Schedule Of Commitments And Contingencies [Line Items]
Number of Product liability cases | Case		4	4
Number of Other product liability claims | Claim		1	1
Defense and administrative costs		$ 606,000		$ 584,000	$ 322,000
Settlement fees related to product liability cases		65,000		3,000	180,000
Expense related to changes in product liability and municipal litigation liability		388,000		892,000	$ 293,000
Environmental reserve in non-current liabilities		0		$ 0
Minimum
Schedule Of Commitments And Contingencies [Line Items]
Compensatory damages sought		75,000
Maximum
Schedule Of Commitments And Contingencies [Line Items]
Compensatory damages sought		$ 50,000,000.0
Putative Class
Schedule Of Commitments And Contingencies [Line Items]
Date of actions filed		December 16, 2019	December 16, 2019
Number of plaintiffs | Plaintiff		2	2
Putative Class | General Damages
Schedule Of Commitments And Contingencies [Line Items]
Aggregate damages claims			$ 50
Putative Class | Compensatory or Punitive Damages
Schedule Of Commitments And Contingencies [Line Items]
Aggregate damages claims			$ 100
John Pidcock
Schedule Of Commitments And Contingencies [Line Items]
Number of plaintiffs | Plaintiff		2	2
John Pidcock | Preferential Transfers
Schedule Of Commitments And Contingencies [Line Items]
Compensatory damages sought		$ 4,200,000
John Pidcock | Turnover of Goods
Schedule Of Commitments And Contingencies [Line Items]
Compensatory damages sought		$ 1,500,000
Gemini Technologies, Incorporated | Smith & Wesson Corp
Schedule Of Commitments And Contingencies [Line Items]
Compensatory damages sought	$ 18,600,000

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