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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 |

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