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Leases - Schedule of Assets and Liabilities Related to Operating and Financing Leases (Detail) - USD ($)
$ in Thousands
Apr. 30, 2021
Apr. 30, 2020
Operating Leases    
Right-of-use assets $ 7,126  
Accumulated amortization (2,363)  
Right-of-use assets, net $ 4,763  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other assets  
Current liabilities $ 1,309 $ 1,506
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued expenses and deferred revenue  
Non-current liabilities $ 3,630  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other non-current liabilities  
Total operating lease liabilities $ 4,939  
Finance Leases    
Right-of-use assets 40,986 40,986
Accumulated depreciation (4,231)  
Right-of-use assets, net $ 36,755  
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] swbi:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization  
Current liabilities $ 1,087 1,046
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued expenses and deferred revenue  
Non-current liabilities $ 38,786 $ 39,873
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Non-current liabilities  
Total finance lease liabilities $ 39,873