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Net Sales - Additional Information (Detail) | 12 Months Ended
--- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Disclosure Net Sales [Abstract] |  |  |
Export sales as percentage of revenue | 5.00% | 3.00% | 3.00%

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- Definition Disclosure net sales. + References No definition available. + Details
Name: | aobc_DisclosureNetSalesAbstract
Namespace Prefix: | aobc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Export sales as percentage of revenue. + References No definition available. + Details
Name: | aobc_ExportSalesAsPercentageOfRevenue
Namespace Prefix: | aobc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration