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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