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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 |

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