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Self-Insurance Reserves - Summary of Other Liabilities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Commitments And Contingencies Disclosure [Abstract]
Beginning balance	$ 8,663	$ 10,082	$ 9,610
Additional provision charged to expense	22,802	15,801	16,781
Payments	(22,292)	(17,220)	(16,309)
Ending balance	$ 9,173	$ 8,663	$ 10,082

X

- Definition

Self insurance reserve, deductions.

+ References

No definition available.

+ Details

Name:	aobc_SelfInsuranceReserveDeductions
Namespace Prefix:	aobc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Self-insurance reserves expense.

+ References

No definition available.

+ Details

Name:	aobc_SelfInsuranceReservesExpense
Namespace Prefix:	aobc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_SelfInsuranceReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant