Fair Value Of Rights Issued

No definition available.

Name:	boasu_FairValueOfRightsIssued
Namespace Prefix:	boasu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unit composition and public rights terms.

+ References

No definition available.

+ Details

Name:	boasu_UnitCompositionAndPublicRightsTerms
Namespace Prefix:	boasu_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow associated with the amount received from entity's first offering of stock to the public.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

+ Details

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

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

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

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Initial Public Offering - Additional Information (Detail) - USD ($)		6 Months Ended
	Aug. 05, 2026	Jun. 30, 2026
Subsequent Event [Member]
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance initial public offering	$ 143,750,000
Unit composition and public rights terms	Each Unit consists of one Class A ordinary share and one right (each, a “Public Right”) to receive one Class A ordinary share upon the consummation of an initial Business Combination.
IPO [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of stock, price per share		$ 10
IPO [Member] \| Subsequent Event [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of stock, number of shares issued in transaction	14,375,000
Sale of stock, price per share	$ 10
Fair value of rights issued	$ 31,781,698
Class A ordinary shares [Member] \| Subsequent Event [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of stock, number of shares issued in transaction	12,500,000
Over-Allotment Option [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of stock, number of shares issued in transaction		1,875,000
Over-Allotment Option [Member] \| Subsequent Event [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of stock, number of shares issued in transaction	1,875,000