{"cik":1990354,"taxonomy":"us-gaap","tag":"LongTermDebt","label":"Long-term Debt","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","entityName":"Waystar Holding Corp.","units":{"USD":[{"end":"2024-12-31","val":1243545000,"accn":"0001410578-25-000148","fy":2024,"fp":"FY","form":"10-K","filed":"2025-02-18","frame":"CY2024Q4I"},{"end":"2025-12-31","val":1481246000,"accn":"0001990354-26-000011","fy":2025,"fp":"FY","form":"10-K","filed":"2026-02-17","frame":"CY2025Q4I"}]}}