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Leases - Schedule of Assets and Liabilities Related to Operating and Financing Leases (Detail) - USD ($) $ in Thousands | Jan. 31, 2020 | Apr. 30, 2019
--- | --- | ---
Operating Leases |  |
Right-of-use assets | $ 11,782 |
Accumulated amortization | (1,982) |
Right-of-use assets, net | $ 9,800 |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:OtherAssetsNoncurrent |
Current liabilities | $ 2,731 |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | aobc:AccruedExpensesAndDeferredRevenueCurrent |
Non-current liabilities | $ 8,158 |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilitiesNoncurrent |
Total operating lease liabilities | $ 10,889 |
Finance Leases |  |
Right-of-use assets | 40,986 |
Accumulated depreciation | (1,590) |
Right-of-use assets, net | $ 39,396 |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:PropertyPlantAndEquipmentNet |
Current liabilities | $ 971 | $ 681
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] | aobc:AccruedExpensesAndDeferredRevenueCurrent |
Non-current liabilities | $ 40,202 | $ 45,400
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | us-gaap:FinanceLeaseLiabilityNoncurrent |
Total finance lease liabilities | $ 41,173 |

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