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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 20, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-40956    
Entity Registrant Name Udemy, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 27-1779864    
Entity Address, Address Line One 600 Harrison Street    
Entity Address, Address Line Two 3rd Floor    
Entity Address, City or Town San Francisco    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94107    
City Area Code 415    
Local Phone Number 813-1710    
Title of 12(b) Security Common Stock, $0.00001 par value    
Trading Symbol UDMY    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 938.6
Entity Common Stock, Shares Outstanding   158,088,671  
Documents Incorporated by Reference
Portions of the registrant’s Definitive Proxy Statement relating to the registrant’s 2024 Annual Meeting of Stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. Such Definitive Proxy Statement will be filed with the Securities and Exchange Commission within 120 days after the end of the registrant’s fiscal year ended December 31, 2023.
    
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023    
Entity Central Index Key 0001607939