{"cik":2098712,"taxonomy":"us-gaap","tag":"LiabilitiesAndStockholdersEquity","label":"Liabilities and Equity","description":"Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.","entityName":"GigCapital9 Corp.","units":{"USD":[{"end":"2025-12-31","val":155828,"accn":"0001193125-26-134550","fy":2025,"fp":"FY","form":"10-K","filed":"2026-03-31","frame":"CY2025Q4I"}]}}