v3.25.2
Cover
Jul. 23, 2025
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jul. 23, 2025
Entity File Number 001-42125
Entity Registrant Name Waystar Holding Corp.
Entity Central Index Key 0001990354
Entity Tax Identification Number 84-2886542
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 1550 Digital Drive
Entity Address, Address Line Two #300
Entity Address, City or Town Lehi
Entity Address, State or Province UT
Entity Address, Postal Zip Code 84043
City Area Code 844
Local Phone Number 492-9782
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, par value $0.01 per share
Trading Symbol WAY
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false