Condensed Statements Of Operations (Paranthetical)	Mar. 31, 2026 shares
Ordinary shares [Member]
Common stock subject to forfeiture	1,500,000

Common stock share is subject to forfeiture for over allotment.

No definition available.

Name:	bcss_CommonStockShareIsSubjectToForfeitureForOverAllotment
Namespace Prefix:	bcss_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant