{"cik":2128045,"taxonomy":"us-gaap","tag":"ShareBasedCompensation","label":"Share-based Payment Arrangement, Noncash Expense","description":"Amount of noncash expense for share-based payment arrangement.","entityName":"Bleichroeder Acquisition Corp. III","units":{"USD":[{"start":"2026-04-01","end":"2026-06-30","val":2015750,"accn":"0001213900-26-090096","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-14","frame":"CY2026Q2"}]}}