Statement of Changes In Shareholders' Deficit (Parenthetical)	10 Months Ended
Dec. 31, 2021 shares
IPO [Member]
Sale of units in public offering, less fair value of public warrants, net of offering costs	16,900,000

Sale of units in public offering, less fair value of public warrants, net of offering costs.

No definition available.

Name:	bsaq_SaleOfUnitsInPublicOfferingLessFairValueOfPublicWarrantsNetOfOfferingCosts
Namespace Prefix:	bsaq_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration