| Cover | Dec. 08, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Dec. 8, 2021 |
| Entity Registrant Name | Udemy, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-40956 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.00001 par value per share |
| Trading Symbol | UDMY |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001607939 |
| Amendment Flag | false |
