v3.26.1
Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Jan. 31, 2026
Mar. 16, 2026
Jul. 31, 2025
Document Information [Line Items]      
Document Type 10-K/A    
Amendment Flag true    
Amendment Description ServiceTitan, Inc. (the “Company”) is filing this Amendment No. 1 on Form 10-K/A (the “Amendment”) to its Annual Report on Form 10-K for the fiscal year ended January 31, 2026, originally filed with the U.S. Securities and Exchange Commission (the “SEC”) on March 25, 2026 (the “Annual Report”), solely for the purpose of filing revised certifications by the Company’s principal executive officer and principal financial officer, as Exhibits 31.1 and 31.2 herewith, to correct an inadvertent omission of certain language regarding internal control over financial reporting required to be included in such certifications by Item 601(b)(31)(i) of Regulation S-K.    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Jan. 31, 2026    
Document Fiscal Year Focus 2026    
Document Fiscal Period Focus FY    
Entity Registrant Name ServiceTitan, Inc.    
Entity Central Index Key 0001638826    
Entity File Number 001-42434    
Entity Current Reporting Status Yes    
Entity Well-known Seasoned Issuer Yes    
Current Fiscal Year End Date --01-31    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 26-0331862    
Entity Address, Address Line One 800 N. Brand Blvd.    
Entity Address, Address Line Two Suite 100    
Entity Address, City or Town Glendale    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 91203    
City Area Code 855    
Local Phone Number 899-0970    
Title of 12(b) Security Class A Common Stock, par value $0.001 per share    
Trading Symbol TTAN    
Security Exchange Name NASDAQ    
Entity Public Float     $ 6,046.6
Documents Incorporated by Reference [Text Block]

Portions of the registrant’s definitive proxy statement relating to the registrant’s 2026 annual meeting of stockholders, which will be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year ended January 31, 2026, are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated.

    
Class A Common Stock [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   82,610,069  
Class B Common Stock [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   12,651,154  
Class C Common Stock [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   0