XML 63 R51.htm IDEA: XBRL DOCUMENT v3.10.0.1

Income Taxes - Additional Information (Detail) - USD ($)		3 Months Ended		7 Months Ended	8 Months Ended	12 Months Ended
	Dec. 22, 2017	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Dec. 31, 2017	Apr. 30, 2019	Apr. 30, 2018
Income Tax Contingency [Line Items]
U.S federal income tax rate				21.00%	35.00%
Tax reform, accounting complete	false
Income tax benefit by effect of tax reform							$ 8,700,000
Deferred tax assets and liabilities enacted corporate federal tax rates, cash							$ 0
Effective income tax rate, provisions (benefit)		33.30%	49.60%
Scenario, Forecast
Income Tax Contingency [Line Items]
U.S federal income tax rate						21.00%

X

- Definition

Tax cuts and jobs act change in tax rate provisional income Tax expense (benefit).

+ References

No definition available.

+ Details

Name:	aobc_TaxCutsAndJobsActChangeInTaxRateProvisionalIncomeTaxExpenseBenefit
Namespace Prefix:	aobc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tax cuts and jobs act of 2017, accounting complete.

+ References

No definition available.

+ Details

Name:	aobc_TaxCutsAndJobsActOf2017AccountingComplete
Namespace Prefix:	aobc_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tax cuts and jobs act of 2017, incomplete accounting, income tax expense (benefit).

+ References

No definition available.

+ Details

Name:	aobc_TaxCutsAndJobsActOf2017IncompleteAccountingIncomeTaxExpenseBenefit
Namespace Prefix:	aobc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

+ Details

Name:	us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32059-109318

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

+ Details

Name:	us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: