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Consolidated Statements of Changes in Shareholders’ Equity (Deficit) (Parentheticals)	Jul. 30, 2025 shares
Founder Shares
Shares Subject to Forfeiture	206,250

X

- Definition

It represents amount of shares subject to forfeiture.

+ References

No definition available.

+ Details

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Namespace Prefix:	bsaau_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

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