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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%

X

- Definition

Disclosure net sales.

+ References

No definition available.

+ Details

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Namespace Prefix:	aobc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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