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Leases - Schedule of Assets and Liabilities Related to Operating and Financing Leases (Detail) - USD ($)
$ in Thousands
Jan. 31, 2021
Apr. 30, 2020
Operating Leases    
Right-of-use assets $ 7,273  
Accumulated amortization (2,183)  
Right-of-use assets, net $ 5,090  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsNoncurrent  
Current liabilities $ 1,319 $ 1,506
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] swbi:AccruedExpensesAndDeferredRevenueCurrent  
Non-current liabilities $ 3,951  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent  
Total operating lease liabilities $ 5,270  
Finance Leases    
Right-of-use assets 40,986  
Accumulated depreciation (3,706)  
Right-of-use assets, net $ 37,280  
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet  
Current liabilities $ 1,073 1,046
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] swbi:AccruedExpensesAndDeferredRevenueCurrent  
Non-current liabilities $ 39,060 $ 39,873
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:FinanceLeaseLiabilityNoncurrent  
Total finance lease liabilities $ 40,133