{"cik":2098712,"taxonomy":"us-gaap","tag":"WeightedAverageNumberOfSharesOutstandingBasic","label":"Weighted Average Number of Shares Outstanding, Basic","description":"Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.","entityName":"GigCapital9 Corp.","units":{"shares":[{"start":"2025-10-29","end":"2025-12-31","val":7053712,"accn":"0001193125-26-134550","fy":2025,"fp":"FY","form":"10-K","filed":"2026-03-31","frame":"CY2025Q4"}]}}