{"cik":2137777,"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":"Research Alliance Corporation IV","units":{"shares":[{"start":"2026-04-01","end":"2026-06-30","val":1236263,"accn":"0001193125-26-356882","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-19","frame":"CY2026Q2"}]}}