Private Placement - Additional Information (Detail) - USD ($)		6 Months Ended
Jun. 17, 2026	Jun. 30, 2026
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of private placement		$ 2,215,000
Founder shares underlying membership interests issued to sponsor non managing members		1,818,179
Non Managing Sponsor Membership Interests [Member]
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of private placement		$ 1,000,000
Private Placement [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of stock, number of shares issued in transaction		221,500
Sale of stock, price per share		$ 10
Fair value of rights issued		$ 489,825
Private Placement [Member] \| Sponsor [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of stock, number of shares issued in transaction	221,500	101,500
Proceeds from issuance of private placement		$ 1,015,000
Private Placement [Member] \| Founder Shares [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of stock, number of shares issued in transaction		363,636
Private Placement [Member] \| Non Managing Sponsor Membership Interests [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of stock, number of shares issued in transaction		100,000
Sale of stock, price per share		$ 10
Private Placement [Member] \| Rights [Member] \| Sponsor [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of stock, number of shares issued in transaction		101,500
Fair value of rights issued		$ 224,406

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

Founder shares underlying membership interests issued to sponsor non managing members.

+ References

No definition available.

+ Details

Name:	boasu_FounderSharesUnderlyingMembershipInterestsIssuedToSponsorNonManagingMembers
Namespace Prefix:	boasu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement.

+ 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_ProceedsFromIssuanceOfPrivatePlacement
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_StatementClassOfStockAxis=boasu_NonManagingSponsorMembershipInterestsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=boasu_SponsorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=boasu_FounderSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_RightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: